合金元素对低碳钢热变形行为影响的研究  

Effect of Alloying Elements on Hot Deformation Behavior of Low Carbon Steel

作　　者：苗京涛 周昌磊 黄素霞 李河宗 樊育东 MIAO Jingtao;ZHOU Changlei;HUANG Suxia;LI Hezong;FAN Yudong(School of Mechanical and Equipment Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学机械与装备工程学院,河北邯郸056038

出　　处：《热加工工艺》2023年第14期36-40,共5页Hot Working Technology

基　　金：河北省自然科学基金项目(E2013402064)。

摘　　要：为了探讨Cr元素在结构钢塑性变形过程中的作用,采用Gleeble-1500热模拟实验机对低碳钢进行单向压缩实验,变形温度为730~1000℃,应变速率为0.01~10 s-1,总变形量为0.8,获得了相应的真应力-真应变曲线以及热变形组织,分析讨论了它们的高温变形特征以及合金元素对细化晶粒的作用。结果表明:由于Cr元素的影响,使得两种钢在750~800℃的流变应力变化趋势有所不同;同时,Cr元素的存在,提高了动态再结晶的临界应变量,有利于铁素体形核并抑制晶粒长大,起到细化晶粒的作用。In order to investigate the effect of Cr element on the plastic deformation process of structural steel,the uniaxial compression of low-carbon steel was carried out by Gleeble-1500 thermal simulation experimental machine.The deformation temperature was 730-1000℃,the strain rate was 0.01-10 s-1,and the total deformation was 0.8.The corresponding true stress-true strain curve and the thermal deformation structure were obtained.The high temperature deformation characteristics and the effect of alloying elements on the grain refinement were analyzed and discussed.The results show that due to the influence of Cr element,the flow stress variation trend of the two steels is different at 750-800℃.At the same time,the presence of Cr element improves the critical strain variable of dynamic recrystallization,which is beneficial to the nucleation of ferrite and inhibit the grain growth,which can play a role in grain refinement.

关 键 词：低碳结构钢 真应力-应变曲线 CR元素 动态再结晶 晶粒细化 

分 类 号：TG113[金属学及工艺—物理冶金]