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1Analysis of Microstructure and Mechanical Properties of Ultrafine Grained Low Carbon Steel显示文摘A novel design scheme of hot stamping, quenching and partitioning process was conducted in a quenchable boron steel to obtain the nanometric duplex microstructure comprising ultrafine retained austenite and martensite. It is shown that the materials possess excellent mechanical properties and the ductility can be further improved without compromising the strength. The newly treated steel shows excellent mechanical properties and the total elongation of the steel increases from 6.6% to 14.8% compared with that of hot stamped and quenched steel. Therefore, this kind of steel has become another group of advanced high-strength steels. The microstructure which is mainly responsible for such excellent mechanical properties was investigated.刘和平 SUN Feng'er SUN Hu'er LIU Bin WANG Yi JIN Xuejun 2016Journal of Wuhan University of Technology(Materials Science)2016,31,5:2
2QD08低碳钢高温本构方程及热加工图显示文摘利用Gleeble-3500热模拟试验机研究了QD08低碳钢在1 000~1 200℃和0.1~10 s^(-1)条件下的热变形行为。为了描述高温流动特征,建立了QD08低碳钢的高温流变应力方程。根据试验数据,建立基于动态材料模型的QD08低碳钢热加工图,结合压缩变形后的微观组织观察分析,最终获得试验参数范围内QD08低碳钢热变形的最佳工艺参数。结果表明,保持较高功率耗散效率的加工安全区集中在变形温度为1 070~1 100℃、应变速率为5~10 s^(-1)的区域。结合微观组织分析,该区域成形时低碳钢主要发生动态再结晶,适合进行热加工。王蕾 顾立志 2017特种铸造及有色合金2017,37,6:1
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