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Study on Carburizing and Temperature Rising of the Semi-Steel Melt with Plasma Heating
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作者 Yuan Zhangfu Zeng Jiaqing +2 位作者 Huang Daochang Wan Tianji Fan Yousan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 1997年第1期19-21,共3页
Experiments were carried out on carburizing and temperature rising of the semi steel melt in a plasma induction furnace.Influence of many factors, such as power supply mode,position of the plasma torch and bottom b... Experiments were carried out on carburizing and temperature rising of the semi steel melt in a plasma induction furnace.Influence of many factors, such as power supply mode,position of the plasma torch and bottom blown gas stirring,on heating efficiency and melt temperature distribution was studied. Melt temperature could be effectively controlled by plasma heating,and carbon content of semi steel melt increased from 1.92 % to 4.58 %, and the utilization rate of carbon reached up to 61.57 % during carburizing of the melt. 展开更多
关键词 plasma heating CARBURIZING temperature rising semi steel melt
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Enhanced mechanical properties and formability of 316L stainless steel materials 3D-printed using selective laser melting 被引量:7
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作者 Xiao-qin Yang Ying Liu +3 位作者 Jin-wen Ye Ren-quan Wang Ting-chuan Zhou Bin-yang Mao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第11期1396-1404,共9页
This study is conducted to develop an innovative and attractive selective laser melting(SLM)method to produce 316 L stainless steel materials with excellent mechanical performance and complex part shape.In this work,t... This study is conducted to develop an innovative and attractive selective laser melting(SLM)method to produce 316 L stainless steel materials with excellent mechanical performance and complex part shape.In this work,the subregional manufacturing strategy,which separates the special parts from the components using an optimized process,was proposed.The results showed that produced 316 L materials exhibited superior strength of^755 MPa and good ductility.In the as-built parts,austenite with preferred orientation of the(220)plane,δ-ferrite,and a small amount of CrO phases were present.In addition,the crystal size was fine,which contributed to the enhancement of the parts’mechanical properties.The structural anisotropy mechanism of the materials was also investigated for a group of half-sized samples with variable inclination directions.This technique was used to fabricate a set of impellers with helical bevels and high-precision planetary gears,demonstrating its strong potential for use in practical applications. 展开更多
关键词 316L STAINLESS steel SELECTIVE laser meltING FORMABILITY mechanical properties microstructure
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Effect of melting temperature on microstructural evolutions, behavior and corrosion morphology of Hadfield austenitic manganese steel in the casting process 被引量:7
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作者 Masoud Sabzi Sadegh Moeini Far Saeid Mersagh Dezfuli 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第12期1431-1438,共8页
In this study, the effect of melting temperature on the microstructural evolutions, behavior, and corrosion morphology of Hadfield steel in the casting process is investigated. The mold was prepared by the sodium sili... In this study, the effect of melting temperature on the microstructural evolutions, behavior, and corrosion morphology of Hadfield steel in the casting process is investigated. The mold was prepared by the sodium silicate/CO_2 method, using a blind riser, and then the desired molten steel was obtained using a coreless induction furnace. The casting was performed at melting temperatures of 1350, 1400, 1450, and 1500°C, and the cast blocks were immediately quenched in water. Optical microscopy was used to analyze the microstructure, and scanning electron microscopy(SEM) and X-ray diffractrometry(XRD) were used to analyze the corrosion morphology and phase formation in the microstructure, respectively. The corrosion behavior of the samples was analyzed using a potentiodynamic polarization test and electrochemical impedance spectroscopy(EIS) in 3.5 wt% NaCl. The optical microscopy observations and XRD patterns show that the increase in melting temperature led to a decrease of carbides and an increase in the austenite grain size in the Hadfield steel microstructure. The corrosion tests results show that with increasing melting temperature in the casting process, Hadfield steel shows a higher corrosion resistance. The SEM images of the corrosion morphologies show that the reduction of melting temperature in the Hadfield steel casting process induced micro-galvanic corrosion conditions. 展开更多
关键词 Hadfield steel casting process melting temperature MICROSTRUCTURAL EVOLUTIONS CORROSION BEHAVIOR CORROSION morphology
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Effect of Carbon Properties on Melting Behavior of Mold Fluxes for Continuous Casting of Steels 被引量:2
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作者 I. D. Sommerville A. McLean 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2006年第2期22-26,共5页
During continuous casting of steel, the properties of mold fluxes strongly affect the casting performance, steel quality and environment of casting operation. The high temperature microscopy technique was used to inve... During continuous casting of steel, the properties of mold fluxes strongly affect the casting performance, steel quality and environment of casting operation. The high temperature microscopy technique was used to investigate the melting behaviour of mold fluxes, and drip test method was used to determine their melting rate. The results showed that free carbon is a dominant factor in governing the melting behaviour of fluxes, and the melting rate is increased with increasing carbon reactivity and decreasing carbon content. 展开更多
关键词 continuous casting carbon reactivity mold flux flux melting rate steel
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Preparation and Characterization of Low-melting Glasses Used as Binder for Protective Coating of Steel Slab 被引量:1
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作者 仉小猛 魏连启 +5 位作者 XU Haiwei WANG Shuhua YE Shufeng WANG Xiaojing ZHOU Xun CHEN Yunfa 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第2期380-383,共4页
The low-melting phosphate glass was prepared for production of glass binders for protective coating of steel slab. Effects of different O/P ratios on glass structures and properties were analyzed. Differential thermal... The low-melting phosphate glass was prepared for production of glass binders for protective coating of steel slab. Effects of different O/P ratios on glass structures and properties were analyzed. Differential thermal analysis (DTA) and infrared spectroscopy (IR) techniques were applied for low-melting glass binder. It was found that the glass transition temperature(T) was about 300 ℃ and softening temperature(T1) was about 480 ℃. The choice of O/P ratio was very important to the glass transition and softening temperatures. When more P=O bonds existed in the glass networks, P-O-P bond angle was deformed with decreasing of the ratio of O/E The coatings could adhere to the substrates instantaneously at 800 ℃ when the content of binder exceeded 3wt%. The optimal content of glass binder was 5wt%. 展开更多
关键词 low-melting glasses binders steel slab protective coating
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Electro-deposition tangsten coating on low activation steel substrates from Na_2WO_4-ZnO-WO_3 melt salt
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作者 Liu, Yanhong Zhang, Yingchun +1 位作者 Liu, Qizong Ge, Changchun 《Rare Metals》 SCIE EI CAS CSCD 2012年第4期350-354,共5页
Tungsten coating is considered as a promising alternative material for plasma facing materials(PFC) in future fusion devices.The electro-deposition of tungsten in Na_2WO_4-ZnO-WO_3 melt at 1173 K on low activation ste... Tungsten coating is considered as a promising alternative material for plasma facing materials(PFC) in future fusion devices.The electro-deposition of tungsten in Na_2WO_4-ZnO-WO_3 melt at 1173 K on low activation steel substrates was studied in this work.Adherent and smooth tungsten films were deposited under various pulsed current conditions.The crystal structure and microstructure of tungsten deposits were characterized by XRD,SEM and EDX techniques.The results show that pulsed current density and duty cycle have a significant influence on tungsten nucleation and electro-crystallization phenomena.Uniform and smooth tungsten coating with high purity and high adherence is obtained on low active steel substrates as cathodic current density ranges from 35 to 25 mA·cm_(-2). 展开更多
关键词 TUNGSTEN ELECTRO-DEPOSITION low activation steel pulse current melt
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Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting 被引量:8
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作者 Xiao-qing Ni De-cheng Kong +5 位作者 Ying Wen Liang Zhang Wen-heng Wu Bei-bei He Lin Lu De-xiang Zhu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第3期319-328,共10页
The corrosion behavior and mechanical properties of 316 L stainless steel(SS) fabricated via selective laser melting(SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile exper... The corrosion behavior and mechanical properties of 316 L stainless steel(SS) fabricated via selective laser melting(SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile experiments. The microstructural anisotropy of SLMed 316 L SS was also investigated by electron back-scattered diffraction and transmission electron microscopy. The grain sizes of the SLMed 316 L SS in the XOZ plane were smaller than those of the SLMed 316 L SS in the XOY plane, and a greater number of low-angle boundaries were present in the XOY plane, resulting in lower elongation for the XOY plane than for the XOZ plane. The SLMed 316 L was expected to exhibit higher strength but lower ductility than the wrought 316 L, which was attributed to the high density of dislocations. The pitting potentials of the SLMed 316 L samples were universally higher than those of the wrought sample in chloride solutions because of the annihilation of MnS or(Ca,Al)-oxides during the rapid solidification. However, the molten pool boundaries preferentially dissolved in aggressive solutions and the damage of the SLMed 316 L in FeCl3 solution was more serious after long-term service, indicating poor durability. 展开更多
关键词 selective laser meltING mechanical property corrosion resistance 316L STAINLESS steel ANISOTROPY MOLTEN POOL boundary
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Growth and aggregation control of spinel by shear-force-based melting modification of stainless steel slag
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作者 Qing Zhao Cheng-jun Liu +2 位作者 Tian-ci Gao Long-hu Cao Mao-fa Jiang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第10期1140-1147,共8页
To improve the efficiency of melting modification for stainless steel(SS) slag, a shear force was introduced in this work and its effects on the spinel and silicate melt were experimentally investigated. The results i... To improve the efficiency of melting modification for stainless steel(SS) slag, a shear force was introduced in this work and its effects on the spinel and silicate melt were experimentally investigated. The results indicated that the use of shear force changed the nucleation and growth behaviors of spinel and that the effects of shear force varied with its intensity. The aggregation behavior of spinel under different shear-force conditions was studied, revealing that large spinel clusters could be formed when the stirring speed was controlled. However, no notable change in the melt structure of the silicate was detected in this study. The optimal stirring speed for the melting modification treatment was 50 r·min^(-1), which substantially promoted spinel growth and aggregation, resulting in modified SS slag with excellent chromium sequestration capability. 展开更多
关键词 stainless steel slag SPINEL crystal GROWTH meltING MODIFICATION SHEAR force chromium SEQUESTRATION
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Modelling the Influence of Air Jet Configurations on Non-Woven Steel Fibre Mixing in the Melt Overflow Process
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作者 Ismail Abubakar Hugh Gong +2 位作者 Sathish K. Nammi Lee Marston James Deane 《Modeling and Numerical Simulation of Material Science》 2022年第2期24-45,共22页
The mixing of non-woven steel fibres in melt overflow process for use in automotive muffler systems was simulated. The aim was to identify optimum parameters for achieving a good fibre mix. Numerical models of mixing ... The mixing of non-woven steel fibres in melt overflow process for use in automotive muffler systems was simulated. The aim was to identify optimum parameters for achieving a good fibre mix. Numerical models of mixing chambers of melt overflow process were developed. Multiphysics analyses involving heat transfer, fluid flow and particle tracking were carried out using COMSOL code. The influence of air jet configurations on the fibre distribution was studied. The fibres settled on the moving bed within the mixing chamber were examined for their uniformity. The effect of additional air jets to the existing chamber in a range of regions was explored. An optimum configuration was identified by analyzing the compactness of the particle clusters deposited in the simulation and validated using pixel data acquired from real time imaging. The results showed that by employing dual air jets at the front end of the chamber, the density of the fibre material has improved. We conclude that through multi-physics modelling, it was possible to identify the optimum air-jet configurations leading to fibre uniformity and its distribution. This work also paves the way for incorporating a vision system to evaluate fibre density in real time. 展开更多
关键词 Non-Woven steel Fibre steel Fibre Casting melt and Overflow Pneumatic Conveying Multi-Physics Simulation
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激光熔凝处理对P20钢组织及性能的影响
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作者 李勇 缪星旭 +3 位作者 张成佳 姜鹤明 王坤 王小瑾 《表面技术》 EI CAS CSCD 北大核心 2024年第9期209-215,共7页
目的提高P20模具钢的表面硬度和耐磨性能。方法采用激光熔凝技术对P20模具钢表面进行强化处理。通过硬度梯度检测和摩擦磨损测试,分别评价熔凝层的硬度分布特征和耐磨性能,并通过光学显微镜和扫描电子显微镜对熔凝层及磨痕形貌进行分析... 目的提高P20模具钢的表面硬度和耐磨性能。方法采用激光熔凝技术对P20模具钢表面进行强化处理。通过硬度梯度检测和摩擦磨损测试,分别评价熔凝层的硬度分布特征和耐磨性能,并通过光学显微镜和扫描电子显微镜对熔凝层及磨痕形貌进行分析。结果使用激光输出功率为500W、光斑直径为2.5mm、聚焦透镜距离为40 mm、扫描速度为6 mm/s、搭接率为45%、氮气保护的激光熔凝工艺所得熔凝层的组织细小,无脱碳、畸变、裂纹等缺陷,熔凝处理质量高。熔凝过程中单道激光熔凝层呈半椭圆形分布,最大深度为610~620μm。熔凝处理后表面硬度提升显著,熔凝层的硬度分布与熔凝层的区域位置有关,具有较高硬度且硬度保持基本稳定的熔凝层深度约为400μm;单道激光熔凝层最高硬度可达460~480HV,重叠影响区即双熔凝区的最高硬度在540~560HV之间,即熔凝层硬度普遍较基体硬度提高了60%以上。此外,P20模具钢经过激光熔凝处理后耐磨性能提升明显,其平均摩擦因数约为0.85,熔凝处理的磨损失重较未处理的试样减少了约61%,其磨损机制主要表现为磨粒磨损和少量的黏着磨损或剥落脱离。结论激光熔凝处理能够显著提高P20模具钢的表面硬度和耐磨性能,试验采用的激光熔凝工艺可在P20钢表面获得硬度较高且稳定可靠的熔凝层深度在400μm左右,能将P20模具钢的表面硬度及耐磨性提高60%以上。 展开更多
关键词 P20模具钢 激光熔凝 熔凝层 显微硬度 金相组织 摩擦磨损
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Mn18Cr18N加压冶炼的氮含量精准控制工艺分析与实验
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作者 林腾昌 李龙飞 程挺 《特殊钢》 2024年第4期111-116,共6页
高氮不锈钢中氮含量的精准控制是生产关键控制要素。以Mn18Cr18N高氮钢为研究对象,利用冶金学原理、Factsage热力学软件及热态实验与检测分析等方法,对加压感应熔炼过程钢种成分、温度及氮气压力与氮含量控制的关系进行研究。结果表明,... 高氮不锈钢中氮含量的精准控制是生产关键控制要素。以Mn18Cr18N高氮钢为研究对象,利用冶金学原理、Factsage热力学软件及热态实验与检测分析等方法,对加压感应熔炼过程钢种成分、温度及氮气压力与氮含量控制的关系进行研究。结果表明,基于理论数据的“成分-温度-压力”关系方程可信度高,3炉实验的氮气压力理论值、预测值与实际控制值吻合度良好。热态实验验证发现,Mn和Cr含量不变时,依靠提高氮分压可以提高钢锭中N含量,但是w[N]达到约1%时,通过提高氮分压增加氮含量的效果降低。Mn或Cr含量低时,可以通过提高氮分压达到提高氮含量的目的。降低钢中C和Si含量有利于钢中高氮含量的合金化及稳定控制。当需要控制Mn18Cr19N钢中的w[N]≥0.8%时,宜控制加压炉熔炼温度在1500~1550℃,氮气压力在0.225~0.325 MPa。 展开更多
关键词 MN18CR18N 高氮钢 加压熔炼 热力学 氮含量
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基于激光重熔的SLM成形316L不锈钢温度场仿真及工艺优化
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作者 郑志军 郑翔 《材料导报》 EI CAS CSCD 北大核心 2024年第17期262-268,共7页
SLM成形过程中激光重熔可改善冶金质量和提高性能,但是目前激光重熔对温度场的影响尚不清楚。本工作利用有限元方法建立316L不锈钢模型,对比未重熔与激光重熔的温度场特征,分析不同重熔工艺参数下的温度结果和不同重熔工艺参数下所制备... SLM成形过程中激光重熔可改善冶金质量和提高性能,但是目前激光重熔对温度场的影响尚不清楚。本工作利用有限元方法建立316L不锈钢模型,对比未重熔与激光重熔的温度场特征,分析不同重熔工艺参数下的温度结果和不同重熔工艺参数下所制备样品的致密度和孔隙尺寸。结果表明,激光重熔有较好的预热效果,单层成形最低温度提高了约69%,多层成形因热量扩散影响预热效果仅将温度提高10%。激光重熔工艺对激光第一次扫描的最高温度没有影响,但可提高第二次扫描的温度。重熔激光能量密度从29 J/m升至117 J/m,最高温度上升了36.40%,最低温度上升了12%。致密度的改善不明显,但孔隙尺寸有明显的减小。当激光重熔能量密度为50 J/m时,致密度高达99.95%,孔隙的深度和宽度下降了64.9%和35.2%。 展开更多
关键词 选区激光熔化 激光重熔 316L不锈钢 温度场仿真
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不锈钢激光选区熔化单道成形表面介观模拟与实验验证
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作者 李岩 刘琪 +2 位作者 李亚杰 李聚才 吴志生 《表面技术》 EI CAS CSCD 北大核心 2024年第17期135-145,共11页
目的为了获得不锈钢激光选区熔化单道成形质量好的加工参数,提高成形质量。方法对于316L不锈钢材料的激光选区熔化(SLM)成形,采用离散元方法(DEM)构建颗粒随机分布的三维介观模型,采用流体体积法(VOF)动态追踪SLM成形过程熔池传热、流... 目的为了获得不锈钢激光选区熔化单道成形质量好的加工参数,提高成形质量。方法对于316L不锈钢材料的激光选区熔化(SLM)成形,采用离散元方法(DEM)构建颗粒随机分布的三维介观模型,采用流体体积法(VOF)动态追踪SLM成形过程熔池传热、流动和凝固等行为,该模拟考虑相变潜热、热物性参数随温度非线性变化、Marangoni效应,研究了温度梯度引起的表面张力和蒸汽反冲力等现象对熔池液态金属流动和凝固的影响,并对不同激光参数和扫描速度对熔池温度场和内部流动的影响规律进行了分析。结果当激光功率为150 W、扫描速度为400 mm/s时,激光能使不锈钢粉末充分熔化,凝固后的轨迹形貌连续光滑。通过提高激光扫描速度和降低激光功率使得热输入减小,熔道表面成形出现球化等缺陷。结论通过单道成形实验观察和分析熔池与熔道的三维尺寸与形貌,有效验证了数值模拟的正确性,较好地预测出SLM过程中的缺陷种类,为深入理解SLM过程中的复杂物理现象和优化工艺参数提供了参考。 展开更多
关键词 激光选区熔化 熔池流动 316L不锈钢 介观模拟 单道
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热加工过程中M50轴承钢一次碳化物的形成与演化
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作者 侯志远 刘威峰 +2 位作者 徐斌 孙明月 时婧 《热加工工艺》 北大核心 2024年第1期105-110,114,共7页
针对M50轴承套圈生产过程中的真空感应熔炼、真空自耗重熔、锻造、轧制、辗环五个环节,利用OM、SEM、EDS及X射线三维成像技术分析了一次碳化物在整个生产流程中的演化。结果表明:真空感应熔炼后粗大的一次碳化物M2C和MC沿晶间呈网状析出... 针对M50轴承套圈生产过程中的真空感应熔炼、真空自耗重熔、锻造、轧制、辗环五个环节,利用OM、SEM、EDS及X射线三维成像技术分析了一次碳化物在整个生产流程中的演化。结果表明:真空感应熔炼后粗大的一次碳化物M2C和MC沿晶间呈网状析出,真空自耗重熔可减少一次碳化物的析出,自耗锭边缘处析出的一次碳化物尺寸较小,体积分数最少,为2.614%。锻造过程中网状一次碳化物被部分破碎,轧制和辗环可进一步破碎一次碳化物并使其沿加工流线分布,但并不能完全改变一次碳化物分布不均匀的情况。热变形在破碎细化碳化物的同时也会在一次碳化物内部及周围形成孔洞。 展开更多
关键词 M50轴承钢 一次碳化物 冶炼 热加工
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低碳铝镇静钢精炼渣理化性能研究及动态调控
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作者 王多刚 虞大俊 夏云进 《安徽工业大学学报(自然科学版)》 CAS 2024年第5期474-482,共9页
为提升低碳铝镇静钢水的可浇性,基于低碳铝镇静钢精炼渣的热力学计算,研究典型组分CaO/Al2O3(C/A)、SiO_(2)、FeO对精炼渣液相线温度、1650℃黏度和表面张力的影响规律,结合精炼渣理化性能(熔点和黏度-温度曲线)测试结果,建立吹氩直上... 为提升低碳铝镇静钢水的可浇性,基于低碳铝镇静钢精炼渣的热力学计算,研究典型组分CaO/Al2O3(C/A)、SiO_(2)、FeO对精炼渣液相线温度、1650℃黏度和表面张力的影响规律,结合精炼渣理化性能(熔点和黏度-温度曲线)测试结果,建立吹氩直上精炼渣动态调控模型,并投入生产实践应用。结果表明:随着C/A增加,精炼渣熔点在渣中SiO_(2)质量分数为5%时单调升高,在渣中SiO_(2)质量分数为10%时先降后升,另随C/A的增加精炼渣黏度及黏度-温度曲线的转折温度升高;精炼渣组分范围为C/A 0.75~1.50、SiO_(2)质量分数0~10%、FeO质量分数2%~6%时,可获得较低的液相线温度、较高的黏度和表面张力。生产实践中应用建立的模型可实现造渣物料的动态加入,精炼渣理化性能的稳定性得到显著提升,精炼渣的C/A和全铁(TFe)质量分数标准差明显降低;液相线温度、1650℃时的黏度和表面张力平均值分别降低6.9℃、增加0.0206 Pa·s和0.0109 N/m;全氧(TO)质量分数均值由2.78×10(-3)%下降为2.25×10(-3)%,改进了19.1%,钢水的可浇性得到显著改善。 展开更多
关键词 低碳铝镇静钢 吹氩 精炼渣 动态调控 熔化温度 黏度 表面张力 钙铝比
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基于卷积神经网络的钢铁熔融金属危害监测预警系统
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作者 廖磊 李冬 陶婷婷 《工业安全与环保》 2024年第7期56-59,共4页
为保证钢铁熔融过程安全运行,提出了一个基于卷积神经网络算法的熔融金属危害监测预警系统,其整体架构由实时监控、安全巡检、安全预警、应急救援和信息化管理5个功能模块组成,其算法部分利用图像识别技术对熔融过程进行危险监测。该系... 为保证钢铁熔融过程安全运行,提出了一个基于卷积神经网络算法的熔融金属危害监测预警系统,其整体架构由实时监控、安全巡检、安全预警、应急救援和信息化管理5个功能模块组成,其算法部分利用图像识别技术对熔融过程进行危险监测。该系统可以有效提高监测预警效率,在安全管理领域具有广泛的应用潜力。 展开更多
关键词 钢铁熔融 危害监测 预警 卷积神经网络
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振动对铜钢双金属熔铸复合材料凝固组织的影响
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作者 杨世豪 尹延国 +1 位作者 方小亮 李志明 《铸造》 CAS 2024年第1期17-24,共8页
通过在铜钢双金属熔铸工艺的冷却过程中对铸件施加机械振动,研究在0.2 mm振幅条件下,振动频率对铜合金凝固组织和铜钢双金属结合面的影响。结果表明:在铸件冷却阶段对其施加振幅0.2 mm、频率40 Hz的机械振动能够有效细化铜合金侧凝固组... 通过在铜钢双金属熔铸工艺的冷却过程中对铸件施加机械振动,研究在0.2 mm振幅条件下,振动频率对铜合金凝固组织和铜钢双金属结合面的影响。结果表明:在铸件冷却阶段对其施加振幅0.2 mm、频率40 Hz的机械振动能够有效细化铜合金侧凝固组织,布氏硬度和组织均匀性显著提升,铜合金晶粒尺寸减小并由枝晶转化为等轴晶,铅元素偏析和聚集现象得到明显改善,有效消除气孔和显微缩松。铜合金和钢基体之间形成冶金结合,未振动和施加振动后剪切断裂模式均为混合断裂,振动后由于α+δ硬脆相的分布发生改变而使剪切强度有所降低。 展开更多
关键词 铜钢双金属 熔铸 机械振动 显微组织 界面结合
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钢液真空处理过程中Mn挥发动力学研究
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作者 何瑞翔 张翔 +3 位作者 马国军 陈子宏 郑顶立 杜天雨 《武汉科技大学学报》 CAS 北大核心 2024年第2期81-86,共6页
Mn作为提高钢材强度的主要元素之一,在钢液真空处理过程中的挥发会对钢材成分及质量控制产生不利影响,因此,明确钢液中Mn的挥发机理,并据此精确调控钢液中Mn含量,对于保证钢材质量显得尤为重要。本研究针对X80管线钢的真空精炼处理过程... Mn作为提高钢材强度的主要元素之一,在钢液真空处理过程中的挥发会对钢材成分及质量控制产生不利影响,因此,明确钢液中Mn的挥发机理,并据此精确调控钢液中Mn含量,对于保证钢材质量显得尤为重要。本研究针对X80管线钢的真空精炼处理过程,分析了气相压强和熔炼温度对钢液中Mn挥发行为的影响。结果表明:随着熔炼温度的升高和气相压强的降低,钢液中Mn挥发速率明显加快;在熔炼温度1903 K、气相压强19 Pa、处理时间40 min条件下,Mn挥发率高达92.26%。在熔炼温度1823~1973 K、气相压强19~670 Pa条件下,Mn挥发遵循一级反应规律,其表观挥发速率常数在(0.41~26.56)×10^(-5)m/s范围内;在气相压强19~670 Pa、熔炼温度1903 K的条件下,Mn挥发主要受气相传质的限制;在气相压强226 Pa、熔炼温度1823~1973 K的条件下,Mn挥发的表观活化能达到120.20 kJ/mol,限制性环节为气-液界面反应;本研究条件下,液相传质对Mn挥发速率的影响较小。 展开更多
关键词 真空处理 钢液 MN 挥发 熔炼温度 气相压强 传质系数 动力学
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接枝石油树脂提高热熔膜与不锈钢的界面粘接力
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作者 邱积武 王鹏 +4 位作者 邱迪 袁亚 龙世军 祁红义 李学锋 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2024年第2期124-133,共10页
在海缆、冻土等环境下,通讯光电缆要求使用高耐腐蚀的金属/塑料复合带,但工业上还存在不锈钢/塑料复合带界面难粘接的难题。文中通过熔融接枝法成功制备了C_(5)及C_(9)石油树脂接枝马来酸酐(C_(5)-g-MAH,C_(9)-g-MAH),将其引入乙烯-丙... 在海缆、冻土等环境下,通讯光电缆要求使用高耐腐蚀的金属/塑料复合带,但工业上还存在不锈钢/塑料复合带界面难粘接的难题。文中通过熔融接枝法成功制备了C_(5)及C_(9)石油树脂接枝马来酸酐(C_(5)-g-MAH,C_(9)-g-MAH),将其引入乙烯-丙烯酸共聚物/线型低密度聚乙烯(EAA/LLDPE)热熔膜并与不锈钢基板热贴合,当C_(5)-g-MAH的用量为30 phr时,不锈钢/塑料复合带的剥离强度最优,在泡水测试前后分别达到了28.6 N/cm与15.2 N/cm。接触角测试表明,C_(5)-g-MAH可有效降低EAA/LLDPE热熔膜与不锈钢基板间的表面张力,促进热熔膜在金属表面的贴合。通过差示扫描量热分析、熔体流变行为分析发现,C_(5)-g-MAH可以与EAA/LLDPE热熔膜有效地相容,同时降低热熔膜的熔融温度、活化分子链段,提高对不锈钢表面浸润性的同时增加粘接位点,使得热熔膜与不锈钢基板的界面粘接力大大提升。 展开更多
关键词 接枝石油树脂 不锈钢/塑料复合带 熔融接枝 剥离强度 界面粘接
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工艺参数对激光选区熔化316L零件电解质等离子抛光的影响
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作者 袁益民 李辉 +3 位作者 谢鹏远 王厚强 胡丽 葛晓宏 《电镀与涂饰》 CAS 北大核心 2024年第3期75-83,共9页
[目的]激光选区熔化技术(SLM)制备的316L不锈钢零件表面不易抛光。[方法]采用电解质等离子抛光技术对其进行抛光,研究了工艺参数对工件表面粗糙度(Ra)、微观形貌、元素含量、物相组成和耐蚀性的影响,并采用正交试验法进行工艺优化。[结... [目的]激光选区熔化技术(SLM)制备的316L不锈钢零件表面不易抛光。[方法]采用电解质等离子抛光技术对其进行抛光,研究了工艺参数对工件表面粗糙度(Ra)、微观形貌、元素含量、物相组成和耐蚀性的影响,并采用正交试验法进行工艺优化。[结果]各工艺参数对粗糙度的影响排序为:抛光电压>抛光时间>抛光液温度>下潜深度。最佳工艺参数为:抛光电压320 V,抛光时间300 s,抛光液温度80℃,下潜深度250 mm。抛光后的表面粗糙度可由2.1084μm降低至0.2127μm,表面Cr元素含量由初始的13.92%增大到17.28%,在3.5%NaCl溶液中的腐蚀电位正移,腐蚀电流密度降低。[结论]电解质等离子抛光可有效改善SLM制备的316L零件的表面形貌,降低其表面粗糙度,提高其耐蚀性。 展开更多
关键词 奥氏体不锈钢 激光选取熔化 电解质等离子抛光 正交优化 表面粗糙度 耐蚀性
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