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which were applied with unidirectional loading and bidirectional loading was analyzed, and the deformation properties and calculating method to ductility coefficient were studied. The calculation formulas to ductility coefficient which was based on experimental results and linear regression method were used. The ratio of ultimate strength to plastic strength was considered. The results show......
influencing factor on mechanical behavior of hollow brick wall. The bearing capacity of the wall improves with the increase of the vertical pressure, but the ductility and failure mode of the walls..., but the ductility decreases. The size and position of the structural opening are also the main influencing factor on mechanical behavior of hollow brick wall. The ultimate bearing capacity, rigidity......
镍基耐蚀合金高温加工特性的研究于满1,2,刘明忠1,李京社1,王黎辉1,唐海燕1,包耀宗3(1.北京市新兴铸管集团有限公司2.北京市北京科技大学3.钢铁研究总院 结构材料研究所,北京 10081)摘 要:采用Thermomacmaster-Z热模拟试验机和TEM研究了G3,G3-Z和825镍基耐蚀合金1030℃~1350℃,应变量(ε)0~0.8,变形速率5s-1,25s-1的应力-应变曲线和温度对合金变形抗力和断面收缩率的影响.结果表明,随着温度的升高,合金的变形抗力及其最大值降低,断面收缩率先上升后下降.8......
中碳微合金化钢高温延塑性的研究龚雅林1,张炯明1,甄新刚1,陈少东1,姚永宽2,王道远2(1.北京市北京科技大学 冶金与生态工程学院2.南京钢铁集团中厚板卷厂,江苏南京 210035)摘 要:借助Gleeble1500热模拟试验机测试了含Nb和含Nb,Ti两种中碳微合金化钢的高温力学行为,分析了析出物,相变,动态再结晶对微合金化钢高温延塑性的影响.结果表明:试验钢种无第Ⅱ脆性区出现;含Nb钢第Ⅲ脆性区的温度范围为950~700℃,含Nb,Ti钢第Ⅲ脆性区的温度范围为900~725℃;微合金化元素Ti的加入可以细......
板坯动态二冷增量型PID控制研究孙猛1,王叶婷2,徐磊2,沈厚发0(1.北京市清华大学机械工程系2.大连重工·起重集团有限公司 设计研究院连铸室,辽宁大连 116013)摘 要:为解决连铸拉速工况变化时因使用一级水表配水控制所引起的铸坯表面温度波动的问题,建立了考虑铸坯纵向导热的板坯传热瞬态模型.通过Gleeble试验获得钢的热塑性,制定了铸坯的目标温度.采用增量型PID控制方法开发了动态二冷控制软件Visual Cast.结果表明:与传统的一级水表相比,当拉速发生变化时Visual Cast能够迅速做出反应,......
Hot ductility behavior of V-N and V-Nb microalloyed steelsBing-hua Chen and Hao Yu School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China摘 要:The hot ductility of V-N and V-Nb microalloyed steels was investigated on a Gleeble-1500 thermomechanical simulator, and the results were compared......
重载齿轮钢的高温性能张国强1,2,董瀚2,王毛球2,赵亚平3,刘荣佩-1(1.云南省昆明市昆明理工大学材料与冶金工程学院2.北京市钢铁研究总院先进钢铁材料技术国家工程研究中心3.宝山钢铁股份有限公司 特殊钢分公司,上海 200940)摘 要:通过Gleeble-1500D热模拟试验机高温拉伸试验,对比研究了17Cr2Ni2 MoVNb和17Cr2Ni2 Mo钢的高温性能.结果表明:因微合金元素V(0.1%,质量分数,下同),Nb(0.036%)产生细晶强化及固溶强化,17Cr2Ni2 MoVNb钢的抗拉强度比1......
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and mechanisms to improve ductility and toughness of particle reinforced metal matrix composites Abstract: The factors influencing the ductility and toughness of particle reinforced metal matrix composites were commented. Taking these as a background, the effect of particle shape on the ductility and fracture toughness of SiC p/LD2 composites was deeply studied. Finite......