新型二次硬化渗碳钢的高温塑性及热加工图  

Hot ductility and processing maps of a new secondary hardening carburized steel

作　　者：周敏[1,2] 厉勇[2] 刘荣佩[1] 王春旭[2] 黄顺喆[2] 韩顺[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《钢铁》2016年第6期76-81,93,共7页Iron and Steel

摘　　要：利用Gleeble-3800热模拟试验机,对一种新型二次硬化渗碳钢C61进行了高温轴向压缩试验,测得其高温流变曲线,观察了高温变形后的显微组织,获得了该钢的热变形激活能Q为414.84 k J/mol,建立了试验钢的热变形本构方程,并绘制了其热加工图。结合高温变形后的显微组织和热加工图,确定最优热变形工艺参数为变形温度范围为1 050~1 100℃,应变速率范围为0.1~1.0 s^(-1),此时试验钢组织发生了完全动态再结晶,晶粒明显细化,且对应的能量耗散效率达到峰值。The hot temperature compression behaviors of a new secondary hardening carburized steel-C61 was implemented using Gleeble-3800 thermal simulation testing machine. The high temperature flow curve was determined and the microstructures were observed. The activation energy Q of thermal deformation of the testing steel was 414.84 kJ/mol. The thermal deformation equation and the hot processing map were established. The optimal thermal deformation pro- cessing parameters were determined combined with microstructures after high temperature deformation and the hot processing map. The region of the best thermal deformation temperature ranged from 1 050 to 1 100 ℃ and strain rates from 0.1 to 1.0 s-1 . The behavior of completely dynamic reerystallization could be observed, the grains were refined obviously, and the corresponding energy dissipation efficiency reached the peak.

关 键 词：C61钢 流变应力 激活能 热变形方程 热加工图 

分 类 号：TG142.1[一般工业技术—材料科学与工程]