热处理工艺对Fe-16Mn-1.4C-1.2Al钢组织和硬度的影响  

Effects of Heat Treatment Process on Microstructure and Hardness of Fe-16Mn-1.4C-1.2Al Steel

作　　者：王亚祥 王荣吉[1] 童希 俞杰 WANG Yaxiang, WANG Rongji, TONG Xi, YU Jie(School of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha 410000, Chin)

机构地区：[1]中南林业科技大学机电工程学院

出　　处：《热加工工艺》2018年第14期205-207,212,共4页Hot Working Technology

基　　金：湖南省教育厅科学研究重点项目(14A157)

摘　　要：设计正交试验,研究退火温度、保温时间及冷却方式对Fe-16Mn-1.4C-1.2Al系TWIP钢微观组织和显微维氏硬度的影响。结果显示：热处理参数的影响由强到弱依次为退火温度、保温时间、冷却方式。显微硬度随着退火温度升高和热处理时间延长而降低。600℃处于回复阶段,无退火奥氏体晶粒形核,硬度下降的主要原因是位错缺陷的减少。1000℃完成回复再结晶阶段,晶粒粗化,晶界面积减少,降低了合金抵抗塑形变形的能力是该阶段硬度下降的主要原因。局部受压时,晶界抵抗塑性变形的作用要强于位错缺陷的抵抗作用。The effects of annealing temperature, holding time and cooling mode on microstructure and Vickers hardness of Fe-16 Mn-1.4 C-1.2 Al TWIP steel were studied by orthogonal test. The results show that, the influence of the heat treatment parameters from strong to weak is the annealing temperature, the heat preservation time, the cooling mode. The microhardness decreases with the increase of annealing temperature and the prolongation of heat treatment time. At 600 ℃, the nucleation of austenite grain is not annealed. The main reason for the decrease of hardness is the reduction of dislocation defects. The recovery recrystallization stage is completed at 1000 ℃, and the grain coarsens. The decrease of grain boundary area reduces the ability of the alloy to resist plastic deformation, which is the main reason for the decrease of hardness at this stage. When local pressure is applied, the grain boundary resistance to plastic deformation is stronger than that of dislocation defects.

关 键 词：硬度 热处理 TWIP钢 微观组织 

分 类 号：TG156.2[金属学及工艺—热处理]