S38MnSiV非调质钢热变形行为及组织演变  

Hot Deformation Behavior and Microstructural Evolution of S38MnSiV Micro-alloyed Forging Steel

作　　者：赵阳[1] 袁晓云[1] 陈礼清[1] 刘相华[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,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2013年第9期1244-1247,共4页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2012AA03A508)

摘　　要：利用MMS-300热模拟试验机开展单道次压缩实验和光学显微组织观察,研究了S38MnSiV非调质钢在温度为1 173~1 423 K及应变速率为0.01~10 s-1条件下的热变形行为,获得了应变速率和变形温度对该钢动态再结晶行为及组织的影响规律,按照双曲正弦方法确定了实验钢的热变形激活能和本构方程.结果表明：变形温度越高,应变速率越低,越有利于动态再结晶的发生;随着动态再结晶的进行,奥氏体平均晶粒尺寸随应变的增加逐渐减小;当应力达到稳态时,奥氏体晶粒尺寸不再随应变而发生变化.By conducting single-pass compression test in MMS-300 thermo-mechanical simulator and optical microstructural observation,the hot deformation behavior of S38MnSiV micro-alloyed forging steel w as investigated at temperature of 1 173 ~ 1 423 K and strain rate of 0.01 ~ 10 s-1.The effect law of strain rate and deformation temperature on dynamic recrystallization（DRX） behavior and microstructural evolution w as gained,and the activation energy and the constitutive equation w ere established for hot deformation according to hyperbolic sine method.The results show that DRX is easier to occur at higher deformation temperature and low er strain rate.With the process of DRX,the average austenite grain size decreases w ith the increasing strain.When steady state stress is achieved,the austenite grain size remains almost the same,independent of the strain.

关 键 词：非调质钢 S38MnSiV 热变形行为 动态再结晶 组织演变 

分 类 号：TG142.3[一般工业技术—材料科学与工程]