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
曹中玉 1贾华坡 2赵保伟1
作者信息
- 1. 郑州科技学院机械工程学院,河南郑州 450000
- 2. 郑州科技学院机械工程学院,河南郑州 450000;河南工业大学机电工程学院,河南郑州 450001
- 折叠
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.
Abstract
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 0.2C-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 0.2C-8Mn-2Al steel first increase and then decrease.The austenite transformation volume fraction of the 0.2C-8Mn-2Al steel annealed at 900 ℃ 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 GPa·％,respectively.840 ℃ 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Key words
0.2C-8Mn-2Al steel/intercritical annealing/microstructure/mechanical properties引用本文复制引用
基金项目
河南省高等学校重点科研项目(24B460030)
出版年
2024
NETL
NSTL
万方数据