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Computer Model of Phase Transformation From Hot-Deformed Austenite in Niobium Microalloyed Steels
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作者 XU Yun-bo YU Yong-mei LIU Xiang-hua WANG Guo-dong 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2007年第2期66-69,共4页
Based on thermodynamics and kinetics, a new mathematical model was developed to calculate the CCT diagrams and the transformation kinetics in low carbon niobium steels, in which the effect of deformation on the degree... Based on thermodynamics and kinetics, a new mathematical model was developed to calculate the CCT diagrams and the transformation kinetics in low carbon niobium steels, in which the effect of deformation on the degree of supercooling was taken into account. The undercooling caused by deformation is the major reason for the increase of the starting transition temperature during continuous cooling. The critical cooling rate of bainite formation is within 2--5 ℃s for the studied niobium steels and deformation is suitable for the occurrence of pearlite. The ferrite volume fraction increases with the increase of the austenite boundary area, and decreases with the increase of the cooling rate. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with the measurements. 展开更多
关键词 low carbon niobium steel THERMODYNAMICS supercooling degree continuous cooling transformation computer model
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Influence of Holding Time After Deformation on Bainite Transformation in Niobium Microalloyed Steel 被引量:2
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作者 YI Hai-long DU Lin-xiu WANG Guo-dong LIU Xiang-hua 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2007年第5期62-65,共4页
Using Gleeble-1500 system, the influence of holding time on bainite transformation in deformed niobium microalloyed steel during continuous cooling was analyzed, and the carbides in upper bainite were also systematica... Using Gleeble-1500 system, the influence of holding time on bainite transformation in deformed niobium microalloyed steel during continuous cooling was analyzed, and the carbides in upper bainite were also systematically researched. The results show that the occurrence of the static recrystallization decreases the amount of bainite with an increase in the holding time and the emergence of retained austenite (RA) with the longer holding time. Two types of carbides were observed in upper bainite with regard to their precipitation sites. They either existed between the bainite ferrite laths or co-existed with RA. The formation mechanism of two kinds of carbides was analyzed by combining TEM micrographs with the model. 展开更多
关键词 niobium microalloyed steel BAINITE CARBIDE static recrystallization retained austenite
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Effect of W/Cu composite filler metals on the microstructure and mechanical properties of laser welded pure niobium/304 stainless steel joint 被引量:3
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作者 Shi Mingxiao Zhao Jian +2 位作者 Chen Shujin Hu Qingxian Wang Weilin 《China Welding》 EI CAS 2016年第4期9-13,共5页
Cracking in a laser weld of niobium to stainless steel occurred due to the formation of brittle,continuously distributed Nb-Fe intermetallic compounds.A crack-free joint,which had a tensile strength of 147 MPa,was obt... Cracking in a laser weld of niobium to stainless steel occurred due to the formation of brittle,continuously distributed Nb-Fe intermetallic compounds.A crack-free joint,which had a tensile strength of 147 MPa,was obtained by using the W/Cu composite filler metals.To determine the reasons for cracking in the Nb/SS joint and the function of the W/Cu composite filler metals on the improvement of the cracking resistance of the Nb/W/Cu/SS joint,the microstructures of the joints were studied by optical microscopy,scanning electron microscopy and X-ray diffraction.The cracking susceptibilities of the joints were evaluated with microhardness test on the cross section of the Nb/W/Cu/SS joint.The results showed that the Nb/W/Cu/SS joint was characterized by various solid solution.The formation of solid solution reduced the cracking susceptibility of the joint. 展开更多
关键词 laser welding pure niobium 304 stainless steel microstructure mechanical properties
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Electrochemical behavior of 304 stainless steel with electrodeposited niobium as PEMFC bipolar plates 被引量:2
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作者 Cheng-hao Liang Cai-hong Cao Nai-bao Huang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第4期328-332,共5页
In order to enhance the corrosion resistance of 304 stainless steel, niobium was electrodeposited on its surface in air- and water-stable ionic liquids. The electrochemical behaviors of bare and niobium-coated 304 sta... In order to enhance the corrosion resistance of 304 stainless steel, niobium was electrodeposited on its surface in air- and water-stable ionic liquids. The electrochemical behaviors of bare and niobium-coated 304 stainless steel were evaluated by electrochemical tests in a simulated proton exchange membrane fuel cell (PEMFC) environment. The results showed that niobium could be electrodeposited on the surface of 304 stainless steel from ionic liquids, and a smooth and strong chemical inert compound film was obtained on the surface of 304 stainless steel, which was mainly composed of NbO and Nb2Os. The thin composite film acted as a barrier and remarkably improved the corrosion resistance of 304 stainless steel in the PEMFC environment. 展开更多
关键词 proton exchange membrane fuel cells ELECTRODEPOSITION niobium ionic liquids stainless steel corrosion resistance
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Thermal fatigue behavior of niobium microalloyed H13 steel 被引量:1
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作者 胡心彬 《Journal of Shanghai University(English Edition)》 CAS 2006年第4期375-376,共2页
AISI H13 hot work tool steel is widely used for hot forging, hot-extrusion and die-casting because of its high temperature strength, impact toughness, heat checking resistance and wear resistance, etc. The thermally i... AISI H13 hot work tool steel is widely used for hot forging, hot-extrusion and die-casting because of its high temperature strength, impact toughness, heat checking resistance and wear resistance, etc. The thermally induced surface damage, i. e., thermal fatigne,is believed to be controlled by the magnitude of the imposed cyclic strain. The thermal fatigue on the surface of hot working die, which is responsible to the initiation of the cracks, is reported to result in more than 80 % of the failure of dies. 展开更多
关键词 AISI H13 steel niobium microalloyed thermal fatigue behavior cyclic softening coarsening of carbides Thermo-calc DICTRA software package.
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Electrochemical Behavior of Niobium Electrodeposited 316 Stainless Steel Bipolar Plate for PEMFC in Choline Chloride Based Ionic Liquids 被引量:3
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作者 曹彩红 梁成浩 HUANG Naibao 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第5期1061-1067,共7页
Niobium was electrodeposited on 316 stainless steel bipolar plates of a fuel cell in water and air-stable choline chloride based ionic liquids. The electrochemical corruption property of bipolar plates in simulated PE... Niobium was electrodeposited on 316 stainless steel bipolar plates of a fuel cell in water and air-stable choline chloride based ionic liquids. The electrochemical corruption property of bipolar plates in simulated PEMFC environment was investigated. It was showed that the plating film was distributed on the surface of 316 stainless steel like isolated islands with height less than 50 nm. The XPS, XRD results showed that a smooth and strong chemical inert film of Nb O and Nb2O5 was formed on the surface of 316 stainless steel. In simulated cathodic condition, the corrosion potential of Nb coated stainless steel was improved by 244 m V, whilst in an anodic condition, it was improved by 105 m V. The current densities for the coated 316 stainless steel were decreased to 2.479 4 μA·cm-2 from 14.810 μA·cm-2 at-0.1 V and to 0.576 μA·cm-2 from 13.417 μA/·cm-2 at 0.6 V, respectively. It was implied that the niobium coating effectively decreased the corrosion rate. The results of the electrochemical tests indicated that the corrosion resistance of stainless steel was greatly improved after coated with niobium. 展开更多
关键词 stainless steel bipolar plates niobium coating choline chloride ionic liquids electro deposition corrosion resistance surface modification
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Static and Dpoamic Coarsening of Niobium Carbide in HSLA Steel
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作者 Yang Liu (Department of Materials Engineering,Southwest Jiaolong University,)Chengdu 61 003 1, China 《Journal of Modern Transportation》 1995年第2期149-156,共8页
An experinientally quantitative inveetisation has been made on the precipitationand coarsening behaviors of niobium carbide in a high strength low alloy(HSLA) steel. The results suggest that the static coarsening proc... An experinientally quantitative inveetisation has been made on the precipitationand coarsening behaviors of niobium carbide in a high strength low alloy(HSLA) steel. The results suggest that the static coarsening processes duringisothermal reaction in (α+γ) two phase region and during isothermal stay aftercertain amount of deformation of austenite are principally controlled by thediffusion of niobium atoms along dislocation pipes, and the volume fraction ofthe precipitates exerts sisnificant influence on the coarsening processes.Whereas the dynamic coarsening process during hot deformation of austeniteappoars to be dominated by the carbide/matrix interphase reaction. 展开更多
关键词 PRECIPITATION coaroening niobium carbide HSLA steel
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Calculation and Inspection of Alloy Design of Cr-W- Mo-V High Alloy Steel Addition Niobium for Machinery Knives 被引量:1
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作者 Yongqing Ma Ming Hu 《材料科学研究(中英文版)》 2015年第1期8-14,共7页
关键词 设计计算 高合金钢 合金设计 机械刀具 钒合金 微量铌 钨钼 MC碳化物
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高强韧钻杆用低碳高铌钢的动态CCT曲线测定与分析
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作者 白海瑞 袁晓鸣 +1 位作者 黄利 杨雄 《包钢科技》 2024年第1期47-50,共4页
利用MMS-200热力模拟实验机对高强韧钻杆用低碳高铌钢进行模拟轧制压缩试验,测定绘制低碳高铌钢动态连续冷却转变(CCT)曲线,并研究了冷却速率对显微组织的影响。结果表明,冷速为0.5℃/s时,组织主要由多边形铁素体(PF)和少量珠光体(P)组... 利用MMS-200热力模拟实验机对高强韧钻杆用低碳高铌钢进行模拟轧制压缩试验,测定绘制低碳高铌钢动态连续冷却转变(CCT)曲线,并研究了冷却速率对显微组织的影响。结果表明,冷速为0.5℃/s时,组织主要由多边形铁素体(PF)和少量珠光体(P)组成,同时观察到极少量的针状铁素体(AF);冷速为1℃/s时,组织以针状铁素体(AF)为主,珠光体消失,但仍可见一定比例的多边形铁素体(PF);冷速升高到2℃/s时,转变组织完全为粒状贝氏体(GB);冷速升高到5℃/s时,转变组织以粒状贝氏体(GB)为主,同时出现少量的铁素体贝氏体(FB);冷速升高到30℃/s时,转变组织以铁素体贝氏体(FB)为主,同时出现少量的马氏体(M)。 展开更多
关键词 钻杆 低碳高铌钢 动态CCT曲线 冷却速率 显微组织
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不同Nb含量X80钢管环焊热影响区的微观组织与韧性
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作者 何小东 杨耀彬 +2 位作者 陈越峰 张永青 David Han 《焊接学报》 EI CAS CSCD 北大核心 2024年第3期75-81,I0007,共8页
为研究Nb含量对焊接热影响区微观组织和性能的影响,采用熔化极气体保护焊(gas metal arc welding,GMAW)和手工焊条电弧焊(shielded metal arc welding,SMAW)对0.055%Nb和0.075%Nb含量的X80钢管进行环焊.采用夏比冲击试验和金相分析方法... 为研究Nb含量对焊接热影响区微观组织和性能的影响,采用熔化极气体保护焊(gas metal arc welding,GMAW)和手工焊条电弧焊(shielded metal arc welding,SMAW)对0.055%Nb和0.075%Nb含量的X80钢管进行环焊.采用夏比冲击试验和金相分析方法,研究热影响区的微观组织差异和夏比冲击韧性.并借助扫描电镜和超高温激光共聚焦显微镜分析不同Nb含量X80管体的微观组织对热影响区性能的影响.结果表明,在0℃和-20℃时,0.075%Nb和0.055%Nb的X80钢管GMAW环焊接头热影响区均具有较高的冲击韧性,其平均冲击吸收能量均高于150 J.其中0.055%Nb略高于0.075%Nb的GMAW环焊接头热影响区夏比冲击吸收能量;焊接热输入较低时,0.055%Nb低于0.075%Nb的X80环焊接头粗晶区的韧脆转变温度,具有更好的低温韧性.焊接热输入较高时,0.075%Nb的X80环焊接头粗晶区具有更高的上平台冲击吸收能量,且上平台温度和韧脆转变温度也更低,其低温韧性也更优异;还发现了X80环焊接头热影响区的冲击韧性不仅与热输入量和热影响区马氏体-奥氏体组织(M-A)的形状、大小、分布有关,而且还受管体中Nb含量、原始的强度与韧性、微观组织状态的遗传影响. 展开更多
关键词 含铌X80钢管 环焊接头 热影响区 冲击韧性 M-A组织
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结构用铌钒低合金高强度热轧型钢标准浅析
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作者 徐昊驰 《冶金标准化与质量》 2024年第5期1-3,共3页
本文针对结构用铌钒低合金高强度热轧型钢的技术条件和尺寸标准进行了全面解析。文章首先介绍了钢结构建筑在国内的发展现状以及面临的挑战,进而阐述了《结构用铌钒低合金高强度热轧型钢》标准的制定背景和重要性。在技术条件解析部分,... 本文针对结构用铌钒低合金高强度热轧型钢的技术条件和尺寸标准进行了全面解析。文章首先介绍了钢结构建筑在国内的发展现状以及面临的挑战,进而阐述了《结构用铌钒低合金高强度热轧型钢》标准的制定背景和重要性。在技术条件解析部分,本文详细分析了该型钢的化学成分、力学性能指标、尺寸规格及其允许偏差,并对不同钢级和质量等级的要求进行了明确。此外,本文还重点探讨了铌、钒、钛等微合金化元素在提高型钢性能方面的作用,以及这些元素在焊接热影响区性能提升中的重要性。 展开更多
关键词 铌钒低合金 高强度 热轧型钢 标准解析
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高级别汽车桥壳钢Q460QK的生产
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作者 邢天庆 耿云飞 +1 位作者 杨玉厚 金玉 《河北冶金》 2024年第4期59-63,82,共6页
驱动桥桥壳是中重型商用汽车的重要零件之一,既是承载零件,也是传力部件,同时又是主减速器、差速器及驱动车轮传动装置的外壳,因而要求汽车桥壳钢除具备综合力学性能外,还应具备一定的耐低温疲劳服役性能。由于汽车桥壳零件采用冲压工艺... 驱动桥桥壳是中重型商用汽车的重要零件之一,既是承载零件,也是传力部件,同时又是主减速器、差速器及驱动车轮传动装置的外壳,因而要求汽车桥壳钢除具备综合力学性能外,还应具备一定的耐低温疲劳服役性能。由于汽车桥壳零件采用冲压工艺,且零件形状较为复杂,要求桥壳钢具备一定的成型性能。本文根据汽车桥壳钢加工方式及服役工况,采用低碳锯钛微合金成分体系细化晶粒尺寸,通过高纯净度双联冶炼工艺降低钢水中非金属夹杂物,采用TMCP控轧控冷工艺控制带钢组织类型,生产出了高韧性耐低温Q460QK桥壳钢。采用室温拉伸试验、折弯试验、夏比摆锤冲击试验、光镜检验、扫描电镜检验等检验手段,经检测,该桥壳钢在-60℃温度下冲击功>300J且无明显的韧脆转变点,断后延伸率>24%,冷弯d=a折弯合格,微观组织为铁素体+贝氏体,其中的针状铁素体在改善强度的同时,还能显著提高带钢低温韧性,晶粒度评级达11.5级,带状组织评级1级,具备较优异的综合性能。 展开更多
关键词 桥壳钢 Q460QK 低碳锯钛微合金 高韧性 低温冲击功
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Mechanism of generation of large(Ti,Nb,V)(C,N)-type precipitates in H13 + Nb tool steel 被引量:4
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作者 You Xie Guo-guang Cheng +2 位作者 Lie Chen Yan-dong Zhang Qing-zhong Yan 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第11期1264-1274,共11页
The characteristics and generation mechanism of(Ti,Nb,V)(C,N) precipitates larger than 2 μm in Nb-containing H13 bar steel were studied. The results show that two types of(Ti,Nb,V)(C,N) phases exist—a Ti-V-r... The characteristics and generation mechanism of(Ti,Nb,V)(C,N) precipitates larger than 2 μm in Nb-containing H13 bar steel were studied. The results show that two types of(Ti,Nb,V)(C,N) phases exist—a Ti-V-rich one and an Nb-rich one—in the form of single or complex precipitates. The sizes of the single Ti-V-rich(Ti,Nb,V)(C,N) precipitates are mostly within 5 to 10 μm, whereas the sizes of the single Nb-rich precipitates are mostly 2–5 μm. The complex precipitates are larger and contain an inner Ti-V-rich layer and an outer Nb-rich layer. The compositional distribution of(Ti,Nb,V)(C,N) is concentrated. The average composition of the single Ti-V-rich phase is(Ti_(0.511)V_(0.356)Nb_(0.133))(CxNy), whereas that for the single Nb-rich phase is(Ti_(0.061)V_(0.263)Nb_(0.676))(C_xN_y). The calculation results based on the Scheil–Gulliver model in the Thermo-Calc software combining with the thermal stability experiments show that the large phases precipitate during the solidification process. With the development of solidification, the Ti-V-rich phase precipitates first and becomes homogeneous during the subsequent temperature reduction and heat treatment processes. The Nb-rich phase appears later. 展开更多
关键词 precipitates carbonitrides generating mechanism tool steel niobium
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Mechanical Properties of V-,Nb-,and Ti-bearing As-cast Microalloyed Steels 被引量:6
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作者 J.Rassizadehghani H.Najafi +1 位作者 M.Emamy G.Eslami-Saeen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第6期779-784,共6页
The influence of microalloying additions on the mechanical properties of a low-carbon cast steel containing combinations of V, Nb, and Ti in the as-cast condition was evaluated. Tensile and hardness test results indic... The influence of microalloying additions on the mechanical properties of a low-carbon cast steel containing combinations of V, Nb, and Ti in the as-cast condition was evaluated. Tensile and hardness test results indicated that good combinations of strength and ductility could be achieved by V and Nb additions. While the yield strength and UTS (ultimate tensile strength) increased up to the range of 378-435 MPa and 579- 590 MPa, respectively in the microalloyed heats, their total elongation ranged from 18% to 23%. The presence of Ti, however, led to some reduction in the strength. Microstructural studies including scanning electron microscopy (SEM) and optical microscopy revealed that coarse TiN particles were responsible for this behavior. The Charpy impact values of all compositions indicated that microalloying additions significantly decreased the impact energy and led to the dominance of cleavage facets on the fracture surfaces. It seems that the increase in the hardness of coarse ferrite grains due to the precipitation hardening is the main reason for brittle fracture. 展开更多
关键词 Cast steel Microalloyed steel Titanium niobium VANADIUM
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Effect of Nb on the dynamic recrystallization behavior of high-grade pipeline steels 被引量:4
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作者 Tao Niu Yong-lin Kang +3 位作者 Hong-wei Gu Yu-qun Yin Ming-liang Qiao Jin-xing Jiang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2010年第6期742-747,共6页
The dynamic recrystallization (DRX) behavior of high-grade X80/X100 pipeline steels with different Nb contents was investi- gated through single pass compression experiment using a Gleeble 1500 thermomechanical simu... The dynamic recrystallization (DRX) behavior of high-grade X80/X100 pipeline steels with different Nb contents was investi- gated through single pass compression experiment using a Gleeble 1500 thermomechanical simulator. By the regression of stress-sWain data obtained in the experiment, the deformation activation energy of DRX was identified, and the critical strain was calculated with the Po- liak-Jonas (P-J) method. Based on the analysis, the occurrence condition and kinetics of DRX were determined. The results show that as the Nb content increases from 0.08wt% to 0.095wt%, the activation energy of recrystallization raises from 365 to 395 kJ/mol. The critical swain of DRX can be determined more accurately by the P-J method, and the ratios of critical swain to peak sWain of XS0 and X100 pipeline steels are 0.51 and 0.49, respectively, which are similar to the results achieved by other researchers and calculated with empirical formulae. 展开更多
关键词 pipeline steels niobium dynamic recrystallization activation energy RETARDATION KINETICS
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Effect of Nb and V on the continuous cooling transformation of undercooled austenite in Cr–Mo–V steel for brake discs 被引量:4
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作者 Dan Wu Fu-ming Wang +1 位作者 Jin Cheng Chang-rong Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第8期892-901,共10页
The increasing speed of trains necessitates the development of brake-disc materials that meet more stringent requirements.Therefore,Nb and V have been added to Cr–Mo–V steel to improve its thermal fatigue performanc... The increasing speed of trains necessitates the development of brake-disc materials that meet more stringent requirements.Therefore,Nb and V have been added to Cr–Mo–V steel to improve its thermal fatigue performance when used in brake discs.In this paper,the influences of Nb and V on the static continuous cooling transformation(CCT)behaviors of undercooled austenite were studied.The microstructures,hardness,and dislocation densities at different cooling rates and with the addition of different alloying elements were also investigated.The results show that the transformation products of ferrite,granular bainite,lower bainite,and martensite form under different cooling conditions.With increasing Nb and V contents,the CCT curves are shifted to the left,ferrite and bainite transformations are promoted,and the critical cooling rate of total martensite formation is increased.The added V mainly forms V-rich M_8C_7 precipitates and reduces the dissolved C content;therefore,the A_(c1),A_(c3),and M_s-point temperatures increase.Moreover,the stability of retained austenite is also reduced;its content therefore decreases.Compared with V,the effect of added Nb is weaker because of its smaller content.However,the addition of Nb improves the hardness at lower cooling rates because of the precipitation of fine Nb C particles and refining of the microstructure. 展开更多
关键词 brake-disc steel niobium VANADIUM microstructure continuous cooling transformation
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Thermodynamic Research on Precipitates in Low Carbon Nb-Microalloyed Steels Produced by Compact Strip Production 被引量:3
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作者 Song XIANG Guoquan LIU Yang LI Changrong LI Andong WANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第2期267-272,共6页
Microalloying element Nb in low carbon steels produced by compact strip production (CSP) process plays an important role in inhibiting recrystallization, decreasing the transformation temperature and grain refinemen... Microalloying element Nb in low carbon steels produced by compact strip production (CSP) process plays an important role in inhibiting recrystallization, decreasing the transformation temperature and grain refinement.With decreasing the rolling temperature, dislocations can be pinned by carbonitrides and the strength is increased. Based on the two sublattice model, with metal atom sublattice and interstitial atom sublattice,a thermodynamic model for carbonitride was established to calculate the equilibrium between matrix and carbonitride. In the steel produced by CSP, the calculation results showed that the starting temperature of precipitation of Ti and Nb are 1340℃ and 1040℃, respectively. In the range of 890-950℃, Nb rapidly precipitated. And the maximum of the atomic fraction of Nb in carbonitride was about 0.68. The morphologies and energy spectrum of the precipitates showed that (NbTi) (CN) precipitated near the dislocations. The experiment results show that Nb rapidly precipitated when the temperature was lower than 970℃, and the atomic fraction of Nb in carbonitride was about 60%-80%. The calculation results are in agreement with the experiment data. Therefore the thermodynamic model can be a useful assistant tool in the research on the precipitates in the low carbon steels produced by CSP. 展开更多
关键词 Compact strip production niobium Low carbon microalloyed steels PRECIPITATION Thermodynamic model
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Composition Optimization of Nb-Ti Microalloyed High Strength Steel 被引量:1
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作者 GAN Xiaolong XU Guang +2 位作者 ZHAO Gang ZHOU Mingxing CAll Zhen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第5期1193-1197,共5页
Four Nb-Ti microalloyed steels were refined and rolled to study the composition optimization of Nb-Ti microalloyed steels. The effects of Nb and Ti on the microstructures, precipitates and properties of Nb-Ti microall... Four Nb-Ti microalloyed steels were refined and rolled to study the composition optimization of Nb-Ti microalloyed steels. The effects of Nb and Ti on the microstructures, precipitates and properties of Nb-Ti microalloyed steel were investigated. The results showed that an increase in Ti content resulted in the appearance of many fine precipitates leading to a strong precipitation strengthening effect. Hence, the yield strength increased. Besides, the increased strength by the combined increase of Nb and Ti was similar to that observed for the increase in Ti content alone. This increase in strength was attributed widely to the increase in the Ti content alone rather than Nb. Moreover, the increase in Nb content beyond 0.036 wt% exerted no significant effect on the strength of Ti-Nb microalloyed steels, in which more Ti could be added to further improve the strength of steels. 展开更多
关键词 niobium titanium precipitates properties microalloyed steel
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基于恒等式原理的中国钢铁工业铌资源需求预测研究 被引量:4
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作者 李天骄 刘新茹 +3 位作者 刘越颀 袁小晶 李颖 李建武 《地球学报》 CAS CSCD 北大核心 2023年第2期286-296,共11页
铌主要应用于钢铁的生产,含铌钢材广泛应用于航空航天、海洋工程、汽车与交通、能源化工及工程机械等高端制造领域。中国是当前世界第一大铌资源消费国,供需矛盾极为突出,严重依赖国外资源。为保障中国铌资源供应安全与钢铁产业结构调... 铌主要应用于钢铁的生产,含铌钢材广泛应用于航空航天、海洋工程、汽车与交通、能源化工及工程机械等高端制造领域。中国是当前世界第一大铌资源消费国,供需矛盾极为突出,严重依赖国外资源。为保障中国铌资源供应安全与钢铁产业结构调整提供依据,本文基于恒等式原理构建了钢铁工业铌资源需求预测模型,参考发达国家钢铁工业铌资源消费经验,对中国钢铁工业铌需求进行了定量预测。研究结果表明:(1)中国铌工业和钢铁工业现代化程度明显落后于发达国家;(2)典型发达国家含铌钢产量占粗钢产量比例从最低值增长至最高值呈现出一定的规律性;(3)到2030年,中国钢铁工业铌资源需求将持续增长,2025年钢铁工业铌资源需求为3.3~5.2万t、2030年为4.0~7.1万t,中国铌资源供应安全面临严峻挑战。为此,本文建议持续扩大中国铌资源海外权益产量、提高国内储量、加强铌资源提取和二次资源回收技术研发来保障国内外铌资源稳定的供应,同时推进国内铌相关产业建设。 展开更多
关键词 铌资源 钢铁工业 恒等式原理 需求预测 资源安全
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Effect of Ti and Nb on the recrystallization of ultra low carbon and nitrogen Cr18 stainless steel
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作者 ZHENG Hongguang SHEN Jicheng +2 位作者 WU Difeng SUN Dan CHEN Weiqing 《Baosteel Technical Research》 CAS 2010年第1期25-29,共5页
The effect of Ti and Nb on the recrystallization and the recrystallized grain size of the hot-rolled plates and cold-rolled sheets of ultra low carbon and nitrogen (ULCN) Cr18 ferritic stainless steel (FSS) is inv... The effect of Ti and Nb on the recrystallization and the recrystallized grain size of the hot-rolled plates and cold-rolled sheets of ultra low carbon and nitrogen (ULCN) Cr18 ferritic stainless steel (FSS) is investigated. The results show that the recrystallization of hot-rolled plates and cold-rolled sheets with 0.29% Nb is delayed,and the recrystallized grains are significantly refined. 展开更多
关键词 TITANIUM niobium Cr18 stainless steel RECRYSTALLIZATION
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