新型Mn-Cr齿轮钢的动态再结晶及晶粒细化  

Dynamic Recrystallization and Grain Refinement in a New Mn-Cr Gear Steel

作　　者：王秉新[1] 王佳夫[1] 刘相华[1] 王国栋[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室

出　　处：《钢铁研究学报》2006年第5期38-41,13,共5页Journal of Iron and Steel Research

基　　金：国家重点基础研究发展规划资助项目(G2000067208-4)

摘　　要：采用Gleeble 1500热模拟试验机研究了一种新型Mn-Cr齿轮钢在不同条件下的动态再结晶行为及晶粒尺寸的变化规律,确定了该Mn-Cr齿轮钢的再结晶激活能为378．6 kJ／mol,应力指数为7．08(相对于峰值应力) 或6．2(相对于稳态流变应力)。Z因子唯一地决定着稳态动态再结晶的晶粒尺寸,二者之间为幂指数关系。Z因子通过影响稳态流变应力,进而影响形变储存能来改变再结晶的晶粒尺寸。Dynamic recrystallization and austenite grain size after recrystallization under different deformation conditions for a new Mn-Cr gear steel were studied using a Gleeble 1500 thermomechanical test system. Activation energy and stress exponent were determined as 378. 6 kJ/mol and 7.08 （Z against peak stress） or 6.2 （Z against steady state flow stress） respectively by regression analysis. The recrystallized grain size of austenite d, is determined only by the deformation condition Z because Z affects steady state flow stress, and steady state flow stress in turn determines the stored energy. An exponential function is held between dr and Z.

关 键 词：齿轮钢 变形条件 动态再结晶 奥氏体 晶粒尺寸 

分 类 号：TG111.7[金属学及工艺—物理冶金]