Cr5钢马氏体的相变塑性和应力对其相变动力学的影响  

Martensite Transformation Plasticity and Influence of Stress on Phase Transformation Kinetics of Cr5 Steel

作　　者：王葛 王亚杰 李磊 马占山 胡君泰 陈博伟 李强 WANG Ge;WANG Yajie;LI Lei;MA Zhanshan;HU Juntai;CHEN Bowei;LI Qiang(National Engineering Research Center for Equipment and Technology of CoM Strip Rolling,Yanshan University,Qinhuangdao 066004,China;College of Materials Science and Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛066004 [2]河北工业大学材料科学与工程学院,天津300401

出　　处：《材料研究学报》2018年第7期481-486,共6页Chinese Journal of Materials Research

基　　金：河北省自然科学基金(E2016203119);燕山大学重型机械协同创新课题(ZX01-20140100-03)~~

摘　　要：对大型支承辊用Cr5钢进行不同拉/压载荷作用下的膨胀实验,研究了Cr5钢马氏体的相变塑性和应力对马氏体相变动力学的影响。结果表明,Cr5钢在不同应力作用下马氏体相变系数α基本相同,近似为随温度变化的三次多项式,且随着温度的增加而减小,而应力对α的影响基本上可以忽略;马氏体转变的起始点(Ms)随着应力值的增大而升高;结合Greenwood-Johnson方程求出在不同应力作用下Cr5钢的马氏体相变塑性系数k值,近似约为4.32×10-5的常数。The martensitic transformation plasticity and effect of stress on the martensitic transformation kinetics were investigated by means of dilatometric experiments under different applied tensile and compressive stress on Cr5 steel used for backup rolls. Results show that the martensitic transformation coefficient α of Cr5 steel is almost the same under different stress, in other word, the influence of stress is negligible; Besides, the martensitic transformation coefficient α decreases with the increasing temperature, the relation of which with temperature can be described approximately as a cubic polynomial. The martensite transformation point（MS） increases with the increasing equivalent stress. The k-values of transformation plasticity coefficient under different stress may be acquired as ca 4.32 × 10-5 according to the Greenwood-Johnson equation.

关 键 词：金属材料 马氏体相变 相变动力学 相变塑性 Cr5钢 

分 类 号：TB31[一般工业技术—材料科学与工程] TG151.2[金属学及工艺—热处理]