两相区退火温度对汽车用0.2C-8Mn-2Al钢组织与力学性能的影响  

Effect of intercritical annealing temperature on microstructure and mechanical properties of 0.2C-8Mn-2Al steel for auto

作　　者：曹中玉 贾华坡[1,2] 赵保伟 Cao Zhongyu;Jia Huapo;Zhao Baowei(School of Mechanical Engineering,Zhengzhou University of Science and Technology,Zhengzhou Henan 450000,China;School of Mechanical and Electrical Engineering,Henan University of Technology,Zhengzhou Henan 450001,China)

机构地区：[1]郑州科技学院机械工程学院,河南郑州450000 [2]河南工业大学机电工程学院,河南郑州450001

出　　处：《金属热处理》2024年第9期247-251,共5页Heat Treatment of Metals

基　　金：河南省高等学校重点科研项目(24B460030)。

摘　　要：采用扫描电镜(SEM)、拉伸试验等手段研究了两相区退火温度对热轧态0.2C-8Mn-2Al钢微观组织与力学性能的影响。结果表明,退火态0.2C-8Mn-2Al钢组织主要为奥氏体和铁素体。在780~900℃区间内,随着退火温度的升高,拉伸前后0.2C-8Mn-2Al钢的奥氏体转变体积分数逐渐提高,0.2C-8Mn-2Al钢的抗拉强度、伸长率和强塑积先升高后降低。900℃退火的0.2C-8Mn-2Al钢的奥氏体转变体积分数最高,达到43.4%,840℃退火的0.2C-8Mn-2Al钢的抗拉强度、伸长率和强塑积均达到最大值,分别为1208.6 MPa、31.2%和37.71 GPa·%,840℃为热轧态0.2C-8Mn-2Al钢的最佳退火温度。Effects of intercritical annealing temperature on the microstructure and mechanical properties of hot rolled 0.2C-8Mn-2Al steel were studied by using scanning electron microscope(SEM)and tensile testing.The results show that microstructure of the annealed O.2C-8Mn-2Al steel is mainly composed of austenite and ferrite.In the range of 780℃to 900℃,with the increase of annealing temperature,the volume fraction of austenite transformation in the 0.2C-8Mn-2Al steel before and after stretching gradually increases.Meanwhile,the tensile strength,elongation and product of strength and elongation of the O.2C-8Mn-2Al steel first increase and then decrease.The austenite transformation volume fraction of the 0.2C-8Mn-2Al steel annealed at 900 C is the highest,reaching 43.4%.The tensile strength,elongation and product of strength and elongation of the 0.2C-8Mn-2Al steel annealed at 840℃reach maximum values,which are 1208.6 MPa,31.2%and 37.71 CPa·%,respectively.840 C is the optimal annealing temperature for the hot rolled 0.2C-8Mn-2Al steel.

关 键 词：0.2C-8Mn-2Al钢 两相区退火 微观组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]