Q345钢低温形变微纳米级铁素体制备实验研究  

Experimental research of fabricating micro-nanometer ferrite grain of Q345 steel during deformation at low temperature

作　　者：曹蕾[1] 李学通[1] 王敏婷[1] 杜凤山[1] 

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《燕山大学学报》2013年第1期39-44,共6页Journal of Yanshan University

基　　金：河北省自然科学钢铁联合基金资助项目(E2011203090;E2012203028)

摘　　要：为了充分激发钢材自主控制晶粒的潜力,以Q345为研究对象,采用Gleeble-3500热模拟试验机进行低温大塑性平面变形实验,研究了低温大变形下制备微纳米级晶粒的工艺条件。实验中变形温度为500～700℃,应变速率为0.01～1 s1,并借助数值模拟技术确定出了单道次平面压缩实验最大可产生4.0以上的塑性应变。根据实验金相分析结果,得出了Q345钢低温大变形下铁素体晶粒细化以动态再结晶为主和晶粒尺寸与因子的关系,且获得的铁素体晶粒尺寸小于1 m。实验结果表明,Q345钢低温大塑性形变制备微纳米级铁素体组织是可行的。The process conditions of fabricating micro-nanometer ferrite grain imposed by low temperature and large deformation are investigated using a Gleeble-3500 thermal simulation test machine for plane deformation experiment of Q345 steel in order to fully stimulate the steel＇s potential of autonomous control on grain size.In the experiment,the deformation temperature varies from 500 to 700 ℃,and the strain rate varies from 0.01 to 1 s.The largest strain which is more than 4.0 occurs in the single pass of plane compression experiment via numerical simulation technology.The experimental result of metallographical analyses indicate that the main reason of ferrite grain refinement in Q345 steel is dynamic recrystallization,and that the size of obtained ferrite grain is less than 1 m.In addition,the relationship between grain size and factor is unveiled.The experimental results show that it is feasible to fabricate micro-nanometer ferrite grain during low temperature and large deformation of Q345.

关 键 词：大塑性应变 低温变形 因子 低碳钢 微纳米晶粒 

分 类 号：TG142.23[一般工业技术—材料科学与工程]