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工艺参数对半固态流变铸-锻6061合金成形性的影响 被引量:5
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作者 谭建波 杨帅 李祎超 《河北科技大学学报》 CAS 2016年第1期65-69,共5页
采用分析软件测定6061合金冷却曲线,用手工搅拌法制备半固态6061合金,制备不同温度下的水淬试样,测试了不同温度下的初生固相率。利用H1F100型伺服驱动压力机及杯型实验模具,进行半固态6061合金流变铸-锻成形,研究了合金温度、成形压力... 采用分析软件测定6061合金冷却曲线,用手工搅拌法制备半固态6061合金,制备不同温度下的水淬试样,测试了不同温度下的初生固相率。利用H1F100型伺服驱动压力机及杯型实验模具,进行半固态6061合金流变铸-锻成形,研究了合金温度、成形压力、上型温度、保持时间等工艺参数对半固态6061合金成形性的影响。结果表明:在一套模具内实现铸造和锻造是可行的,合金温度以及上型温度越高,制件的成形性越好。本实验条件下,当半固态合金温度为642~645℃、上型预热温度为200~300℃时,随着保持时间的增加,半固态6061合金铸-锻成形试样容易产生冷隔等铸造缺陷。 展开更多
关键词 金属材料 变铸-锻 6061合金 工艺参数 成形性
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半固态流变铸-锻6061组织均匀性研究 被引量:1
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作者 谭建波 杨帅 李祎超 《铸造》 CAS CSCD 北大核心 2015年第7期686-688,691,共4页
采用分析软件测定T6061合金冷却曲线,并对不同温度下的初生固相率进行了测试。利用H1F100型伺服驱动压力机及杯型试验模具进行了半固态6061合金流变铸.锻成形,研究了工艺参数及热处理对半固态6061合金流变铸.锻成形件组织均匀性的... 采用分析软件测定T6061合金冷却曲线,并对不同温度下的初生固相率进行了测试。利用H1F100型伺服驱动压力机及杯型试验模具进行了半固态6061合金流变铸.锻成形,研究了工艺参数及热处理对半固态6061合金流变铸.锻成形件组织均匀性的影响。研究结果表明:在一套模具内,完成半固态铸造和半固态锻造即半固态铸.锻成形是可行的;合金温度在645℃,上型温度300℃,下型温度350℃,成形比压105MPa,保持时间0~4s时,可得到组织均匀的零件。 展开更多
关键词 半固态 变铸.锻 6061 组织均匀性
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廿年巨变铸辉煌 国泰民安谱新章
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作者 朱良春 《前进论坛》 1999年第2期16-17,共2页
中共十一届三中全会以来的20年,是拨乱反正的20年,也是改革开放的20年,更是认真学习和坚决贯彻邓小平理论的20年,正是“廿年巨变铸辉煌,拨乱反正人心旺,改革开放创佳绩,国泰民安谱新章”。20年来,在中国共产党的领导下,中国... 中共十一届三中全会以来的20年,是拨乱反正的20年,也是改革开放的20年,更是认真学习和坚决贯彻邓小平理论的20年,正是“廿年巨变铸辉煌,拨乱反正人心旺,改革开放创佳绩,国泰民安谱新章”。20年来,在中国共产党的领导下,中国人民励精图治,民族振兴,经济发展,国民... 展开更多
关键词 中共十一届三中全会 邓小平理论 变铸 类风湿性关节炎 实验研究 改革开 慢性结肠炎 “长期共存 医学文化交流 十六字方针
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半固态6061合金流变铸-锻成形及组织均匀性 被引量:9
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作者 谭建波 杨帅 李祎超 《特种铸造及有色合金》 CAS CSCD 北大核心 2015年第6期561-565,共5页
采用分析软件测定了6061合金的冷却曲线,并对不同温度下合金的初生固相率进行了测试。利用HIF100型伺服驱动压力机及杯型试验模具,进行了半固态6061合金流变铸-锻成形,研究了合金温度、成形压力、上型温度、保持时间等工艺参数对半固... 采用分析软件测定了6061合金的冷却曲线,并对不同温度下合金的初生固相率进行了测试。利用HIF100型伺服驱动压力机及杯型试验模具,进行了半固态6061合金流变铸-锻成形,研究了合金温度、成形压力、上型温度、保持时间等工艺参数对半固态6061合金成形性的影响,探讨了工艺参数及热处理对半固态6061合金流变铸一锻成形件组织均匀性的影响。结果表明,在一套模具内,完成半固态铸造和半固态锻造即半固态铸-锻成形是可行的;合金温度在645℃,上型温度为300℃,下型温度为350℃,成形比压为105MPa,保持时间为O~4s时,可得到组织均匀的试件。 展开更多
关键词 半固态 变铸-锻 成形 6061合金 组织均匀性
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沧桑巨变铸我辉煌──唐山抗震20周年重大宣传报道回顾
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《中国广播电视学刊》 CSSCI 北大核心 1997年第9期26-27,共2页
关键词 宣传报道 唐山大地震 变铸 20周年纪念 抗震精神 中央电视台 专题片 《新闻联播》 走向世界 广播电视
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应用切开重焊法纠正整铸长桥的变形
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作者 王建鸿 朱嘉 +1 位作者 张洪斌 连文伟 《实用中西医结合临床》 2010年第1期70-71,共2页
近几年来非贵金属烤瓷在国内临床得到大量应用,而且随着医生和技师技术水平的提高,多单位长桥的制作也越来越多。非贵金属如镍铬烤瓷合金制作金属基底冠,其铸造收缩较贵金属大,而跨度较大的多单位长桥采用整铸法常因铸件收缩变形致... 近几年来非贵金属烤瓷在国内临床得到大量应用,而且随着医生和技师技术水平的提高,多单位长桥的制作也越来越多。非贵金属如镍铬烤瓷合金制作金属基底冠,其铸造收缩较贵金属大,而跨度较大的多单位长桥采用整铸法常因铸件收缩变形致修复体就位困难,分段铸造后再焊接是解决此问题的方法之一。笔者总结多年工作经验,从2000年开始,采用常规整铸法制作金属基底桥架, 展开更多
关键词 前焊法 非贵金属烤瓷桥 长桥
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高效连铸结晶器的应用实践
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作者 杨春政 刘杰 +1 位作者 陈建波 梁红兵 《河北联合大学学报(自然科学版)》 2000年第S1期65-69,共5页
实践表明抛物线锥度结晶器可使拉速显著提高 ,漏钢率降低 ;采用端面密封结晶器可提高铜管寿命 ;采用固定导流水套可解决铸坯菱变问题。
关键词 抛物线锥度 结晶器 密封 坯菱
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小断面连铸坯的脱方缺陷试析(摘要)
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作者 周兰新 巴特尔 《新疆钢铁》 1995年第2期60-60,共1页
本文对矩形还脱方(即菱变)的铸坯进行厂多次取样试验,对脱方形成的理论作了推断,对影响菱变以及角部裂纹的因素(如化学成分的影响、钢水终点含氧量、脱氧、注温和拉速的影响、冷却水和结晶器变形以及结晶器与二冷区上部的对孤等)... 本文对矩形还脱方(即菱变)的铸坯进行厂多次取样试验,对脱方形成的理论作了推断,对影响菱变以及角部裂纹的因素(如化学成分的影响、钢水终点含氧量、脱氧、注温和拉速的影响、冷却水和结晶器变形以及结晶器与二冷区上部的对孤等)作了进一步探讨。认为菱变产生时相伴着裂纹、凸肚、角裂等缺陷,这些缺陷的产生与钢水质量、冷却水质量、结晶器管理以及结晶器与二冷区上部的弧线、足辊的调试等都有直接关系,冷却条件的控制制度对铸坯菱变影响很大。 展开更多
关键词 小断面 结晶器 脱方 新疆钢铁公司 二冷区 试析 坯菱 炼钢厂 角部裂纹
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Mechanical properties and microstructures of Al alloy tensile samples produced by serpentine channel pouring rheo-diecasting process 被引量:8
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作者 陈正周 毛卫民 吴宗闯 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1473-1479,共7页
An innovative one-step semi-solid processing technique of A356 Al alloy,the serpentine channel pouring rheo-diecasting process (SCRC),was explored.The mechanical properties and microstructures of the tensile samples... An innovative one-step semi-solid processing technique of A356 Al alloy,the serpentine channel pouring rheo-diecasting process (SCRC),was explored.The mechanical properties and microstructures of the tensile samples made by the SCRC technique were tested in the as-cast and T6 heat treatment conditions.The experimental results show that the as-cast ultimate tensile strength can reach about 250MPa and the elongation is 8.6%?13.2%.The ultimate tensile strength can increase approximately 30% higher than that of the as-cast one but there is some slight sacrifice of the plasticity after T6 heat treatment.Under these experimental conditions,the semi-solid A356 Al alloy slurry with primary α1(Al) grains,which have the shape factor of 0.78?0.89 and the grain diameter of 35?45μm,can be prepared by the serpentine channel pouring process.The primary α2(Al) grains are very fine during the secondary solidification stage.Compared with the conventional HPDC process,the SCRC process can improve the microstructures and mechanical properties of the tensile test samples.The advantages of the SCRC process include easily incorporating with an existing HPDC machine,cancelling the preservation and transportation process of the semi-solid alloy slurry,and a higher cost performance. 展开更多
关键词 RHEO-DIECASTING A356 aluminum alloy serpentine channel mechanical properties microstructure
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Dry sliding wear behavior of rheocast hypereutectic Al-Si alloys with different Fe contents 被引量:1
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作者 林冲 吴树森 +2 位作者 吕书林 曾劲彪 安萍 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期665-675,共11页
The effect of iron content on wear behavior of hypereutectic Al?17Si?2Cu?1Ni alloy produced by rheocasting process was investigated. The dry sliding wear tests were carried out with a pin-on-disk wear tester. The resu... The effect of iron content on wear behavior of hypereutectic Al?17Si?2Cu?1Ni alloy produced by rheocasting process was investigated. The dry sliding wear tests were carried out with a pin-on-disk wear tester. The results show that the wear rate of the rheocast alloy is lower than that of the alloy produced by conventional casting process under the same applied load. The fine particle-likeδ-Al4(Fe,Mn)Si2 and polygonalα-Al15(Fe,Mn)3Si2 phases help to improve the wear resistance of rheocast alloys. As the volume fraction of fine Fe-bearing compounds increases, the wear rate of the rheocast alloy decreases. Moreover, the wear rate of rheocast alloy increases with the increase of applied load from 50 to 200 N. For the rheocast alloy with 3% Fe, oxidation wear is the main mechanism at low applied load (50 N). At higher applied loads, a combination of delamination and oxidation wear is the dominant wear mechanism. 展开更多
关键词 dry sliding wear hypereutectic Al-Si alloy RHEOCASTING Fe-bearing compound wear mechanism
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Microstructure and property of rheocasting AZ91 slurry produced via ultrasonic vibration process 被引量:1
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作者 尧军平 孙众 +3 位作者 杨涛 Bharat BBUSHAN 龙文元 张磊 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第3期619-625,共7页
The microstructure and mechanical properties of rheocasting AZ91 magnesium alloy were investigated. The semisolid slurry of this alloy was prepared by ultrasonic vibration (USV) process and then shaped by high press... The microstructure and mechanical properties of rheocasting AZ91 magnesium alloy were investigated. The semisolid slurry of this alloy was prepared by ultrasonic vibration (USV) process and then shaped by high pressure diecasting (HPDC). The results show that fine and spherical a-Mg particles were obtained by USV at the nucleation stage, which was mainly attributed to the cavitation and acoustic streaming induced by the USV. Extending USV treatment time increased the solid volume fraction and average particle size, the shape factors were nearly the same, about 0.7. Excellent semisolid slurry of AZ91 magnesium alloy could be obtained within 6 rain by USV near its liquidus temperature. The rheo-HPDC samples treated by USV for 6 min had the maximum ultimate tensile strength and elongation, which were 248 MPa and 7.4%, respectively. It was also found that the ductile fracture mode prevailed in the rheocasting AZ91 magnesium alloy. 展开更多
关键词 AZ91 magnesium alloy ultrasonic vibration RHEOCASTING semisolid slurry mechanical properties fracture surface
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Microstructure of asymmetric twin-roll cast AZ31 magnesium alloy 被引量:4
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作者 赵虎 何良菊 李培杰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第11期2372-2377,共6页
The microstructural distribution along thickness of asymmetric twin-roll cast AZ31 magnesium alloy slab was investigated. It was found that the microstructure along the thickness of the slab was significantly inhomoge... The microstructural distribution along thickness of asymmetric twin-roll cast AZ31 magnesium alloy slab was investigated. It was found that the microstructure along the thickness of the slab was significantly inhomogeneous. There were many deformed bands with flow form near the upper surface of twin-roll cast plate. Very few deformed bands could be seen in the central part of the plate where the dendrites were thick. Fine dendritic structures dominated near the lower surface of the twin-roll cast strip. It is concluded that the shear strain caused by linear velocity difference between surfaces of upper and lower rolls results in the deformed bands of the twin-roll cast slab. Aluminum, zinc and manganese segregate to the boundary of dendrites, while silicon distributes inside the α-Mg solid solution. 展开更多
关键词 AZ31 magnesium alloy asymmetric twin-roll casting deformation bands PRECIPITATE
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INVESTIGATION ON MECHANICAL PROPERTIES OF ZN-AL/SIC PARTICULATE COMPOSITES
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作者 陶杰 肖军 +2 位作者 崔益华 李顺林 沃丁柱 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1995年第1期23-29,共7页
In order to improve the properties of ZA 27 and ZA4-3 zinc alloys and broaden their application ranges,SiC particlj1Ale composites, prepared by means of rheological casting technology, are investigated individually on... In order to improve the properties of ZA 27 and ZA4-3 zinc alloys and broaden their application ranges,SiC particlj1Ale composites, prepared by means of rheological casting technology, are investigated individually on their rT..t'llanical properties. The results of ne-cural strength, impact strensttl, compressive strength, hardness values and wear rate of the composites show that the addition of SiCp, leads to the increase of the compressive strength and hardness values at both room and higher temperature, and wear resistance of the materials, accompanying with the slight decrease of the fie-cural strength and sharp reduction of the impacttoughness. The factors affecting the mechanical properties of the composites are discussed in the paper. 展开更多
关键词 metal matrix composite zinc alloy SiC particle rheological casting technology mechanical properties
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Microstructure and mechanical properties of A356 aluminum alloy wheels prepared by thixo-forging combined with a low superheat casting process 被引量:7
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作者 王顺成 周楠 +1 位作者 戚文军 郑开宏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2214-2219,共6页
The A356 aluminum alloy wheels were prepared by thixo-forging combined with a low superheat casting process. The as-cast microstructure, microstructure evolution during reheating and the mechanical properties of the t... The A356 aluminum alloy wheels were prepared by thixo-forging combined with a low superheat casting process. The as-cast microstructure, microstructure evolution during reheating and the mechanical properties of the thixo-forged A356 aluminum alloy wheels were investigated. The results show that the A356 aluminum alloy billet with fine, uniform and non-dendritic grains can be obtained when the melt is cast at 635 ℃. When the billet is reheated at 600 ℃ for 60 min, the non-dendritic grains are changed into spherical ones and the billet can be easily thixo-forged into wheels. The tensile strength and elongation of thixo-forged wheels with T6 heat treatment are 327.6 MPa and 7.8%, respectively, which are higher than those of a cast wheel. It is suggested that the thixo-forging combined with the low superheat casting process is an effective technique to produce aluminum alloy wheels with high mechanical properties. 展开更多
关键词 aluminum alloy wheel semi-solid metal THIXO-FORGING low-superheat casting
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Effects of moulding sands and wall thickness on microstructure and mechanical properties of Sr-modified A356 aluminum casting alloy 被引量:10
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作者 孙少纯 袁博 刘满平 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期1884-1890,共7页
The effects of different cooling conditions on the mechanical properties and microstructures of a Sr-modified A356 (Al-7Si-0.3Mg) aluminum casting alloy were comparatively investigated using three moulding sands inc... The effects of different cooling conditions on the mechanical properties and microstructures of a Sr-modified A356 (Al-7Si-0.3Mg) aluminum casting alloy were comparatively investigated using three moulding sands including quartz, alumina and chromite into multi-step blocks. The results show that the mechanical properties and microstructures using chromite sand are the best. As the cooling speed increases, the dendrite arm spacing (DAS) decreases significantly and the mechanical properties are improved, and the elongation is more sensitive to the cooling speed as compared with the tensile strength. The increase of the properties is primarily attributed to the decrease of the DAS and the increase of the free strontium atoms in the matrix. In particular, the regression models for predicting both the tensile strength and the elongation for Sr-modified A356 aluminum casting alloy were established based on the experimental data. 展开更多
关键词 A356 aluminum alloy sand casting cooling condition strontium modification MICROSTRUCTURE mechanical properties
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EFFECTS OF MISCHMETAL ADDITION ON THE CAST MICROSTRUCTURE OF 6063 ALLOYS 被引量:4
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作者 刘晶元 丁培道 +1 位作者 潘复生 周守则 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1997年第1期63-69,共7页
Effect of mischmetal addition on the cast microstructure of 6063 alloys has been investigated by means of optical microscopy, TEM and anode filming etc. The results show that there is a critical content of fining dend... Effect of mischmetal addition on the cast microstructure of 6063 alloys has been investigated by means of optical microscopy, TEM and anode filming etc. The results show that there is a critical content of fining dendrite structure by adding mischmetal to 6063 alloys. This critical mischmetal content is about 0.15%. Only when the mischmetal content is above 0.15%, the secondary dendrite arm spacing decreased and eutectic structure fined. The cast grain is obviously refined when the content of mischmetal is lower. Consideration from the cast structure, the suitable mischmetal content in 6063 alloys is 0.20%. 展开更多
关键词 cast structure mischmetal deforming aluminum alloy secondary dendrite arm spacing GRAIN
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Fracture behavior and microstructure of as-cast NiTi shape memory alloy 被引量:2
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作者 江树勇 张艳秋 范红涛 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第6期1401-1406,共6页
The as-cast ingot of equiatomic nickel-titanium shape memory alloy (NiTi SMA) was prepared by vacuum consumable arc melting. The tensile tests and the compressive tests with respect to as-cast NiTi SMA were performe... The as-cast ingot of equiatomic nickel-titanium shape memory alloy (NiTi SMA) was prepared by vacuum consumable arc melting. The tensile tests and the compressive tests with respect to as-cast NiTi SMA were performed to study its mechanical properties of fracture. The microanalysis of as-cast NiTi SMA as well as its fractured samples was performed so as to better understand microstructure evolution and fracture behavior of NiTi SMA. Under tensile loading, the as-cast NiTi SMA shows higher plasticity and is characterized by ductile fracture at 750℃, but it demonstrates poorer plasticity and is characterized by cleavage fracture as well as transcrystalline fracture at room temperature and -100 ℃. Under compressive loading at -100 ~C, the as-cast NiTi SMA is characterized by shear fracture where the normal to the shearing fracture surface inclines about 45° to the compressive axis, and belongs to cleavage fracture where the cracks exoand via transcrvstalline fracture. 展开更多
关键词 NiTi altoy shape memory alloy as-cast-NiTi microstructural evolution fracture behavior
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Dry wear behavior of rheo-casting Al-16Si-4Cu-0.5Mg alloy
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作者 胡钊华 吴国华 +7 位作者 徐佳 莫文飞 李艳磊 刘文才 张亮 丁文江 Jonathan QUAN Yuan-Wei CHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期2818-2829,共12页
Dry wear behavior of the rheo-casting Al-16Si-4Cu-0.5Mg alloy was investigated by micro-scratch and dry sliding weartests. Analyses of the microstructure, scratch grooves, wear tracks, worn surfaces and wear debris of... Dry wear behavior of the rheo-casting Al-16Si-4Cu-0.5Mg alloy was investigated by micro-scratch and dry sliding weartests. Analyses of the microstructure, scratch grooves, wear tracks, worn surfaces and wear debris of the alloy were carried out byoptical microscope and scanning electron microscope. The microstructural analysis showed that via rheo-processing, the primary Siwas refined and rounded, eutectics dispersed more homogenously, and even the skeleton AlFeMnSi phase was fragmented into facetshape. Micro-scratch test showed that the microstructural refinement resulted in better wear resistance. Dry sliding wear test revealedthat the rheo-processed sample exhibit obviously superior wear resistance because of the microstructure improvement. The dominantmechanism in mild wear condition is abrasion, but it turned to adhesion and oxidation in high applied load and fast sliding velocityconditions. 展开更多
关键词 rheo-casting aluminum alloy dry wear micro-scratch
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Microstructure evolution and mechanical properties of rheo-processed ADC12 alloy 被引量:3
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作者 Zhao-hua HU Xiang PENG +4 位作者 Guo-hua WU Da-qiang CHENG Wen-cai LIU Liang ZHANG Wen-jiang DING 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第12期3070-3080,共11页
Microstructure evolution and mechanical properties of the rheo-processed ADC12 alloy were investigated by means ofoptical microscopy, X-ray diffraction and scanning electron microscopy. Primary dendritic Al of rheo-ca... Microstructure evolution and mechanical properties of the rheo-processed ADC12 alloy were investigated by means ofoptical microscopy, X-ray diffraction and scanning electron microscopy. Primary dendritic Al of rheo-casting (RC) andrheo-diecasting (RDC) ADC12 alloys are sheared off. The average size, as well as solid fraction of the primary Al increase withdescending pouring temperature. The mechanical properties of alloys are strengthened by rheo-processing. Ultimate tensile strengthsof RC samples increase with the decrease of the pouring temperature, and reach the maximum in the range from 580 to 600 °C. Atpouring temperature of 595 °C, the RDC sample obtains the best ultimate tensile strength and elongation. Great reductions onporosity and primary Al globularization are crucial to the mechanical properties. Relationships of the primary Al size and yield stressare depicted with Hall?Petch equation. 展开更多
关键词 aluminum alloy CASTING rheo-processing rheo-casting RHEO-DIECASTING mechanical properties
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Miscibility, Crystallization, and Rheological Behavior of Solution Casting Poly(3-hydroxybutyrate)/poly(ethylene succinate) Blends Probed by Differential Scanning Calorimetry, Rheology, and Optical Microscope Techniques
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作者 孙伟华 乔晓平 +1 位作者 曹启坤 刘结平 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第1期107-112,I0002,共7页
The miscibility and crystallization of solution casting biodegradable poly(3-hydroxybuty- rate)/poly(ethylene succinate) (PHB/PES) blends was investigated by differential scanning calorimetry, rheology, and opti... The miscibility and crystallization of solution casting biodegradable poly(3-hydroxybuty- rate)/poly(ethylene succinate) (PHB/PES) blends was investigated by differential scanning calorimetry, rheology, and optical microscopy. The blends showed two glass transition temperatures and a depression of melting temperature of PHB with compositions in phase diagram, which indicated that the blend was partially miscible. The morphology observation supported this result. It was found that the PHB and PES can crystallize simultaneously or upon stepwise depending on the crystallization temperatures and compositions. The spherulite growth rate of PHB increased with increasing of PES content. The influence of compositions on the spherulitic growth rate for the partially miscible polymer blends was discussed. 展开更多
关键词 MISCIBILITY Poly(3-hydroxybutyrate)/poly(ethylene succinate) blend Phase behavior CRYSTALLIZATION
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