摘要
对Fe-8Mn-0.2C-3Al中锰钢采用两步退火的部分奥氏体逆转变(PART)工艺,通过场发射扫描电镜、X射线衍射仪、万能试验机等对试验钢的微观组织和力学性能进行研究。结果表明,随着第一步退火温度的提高,PART工艺处理试验钢的奥氏体含量由49.7%逐渐下降至21.6%,组织呈板条状,屈服强度逐渐升高,抗拉强度和伸长率逐渐下降。755℃×15 min+620℃×30 min处理试验钢获得优秀力学性能,抗拉强度1087 MPa,伸长率43.4%,强塑积47.2 GPa·%,这是由于适中的奥氏体稳定性可以在拉伸过程中充分发挥TRIP效应,提高材料的综合力学性能。
Microstructure and mechanical properties of Fe-8Mn-0.2C-3Al medium Mn steel treated by partial austenite reverse transformation(PART)process with two-step annealing were studied by means of field emission scanning electron microscope,X-ray diffractometer and universal testing machine.The results show that for the tested steel treated by PART process with the increase of first step annealing temperature,the austenite content gradually decreases from 49.7%to 21.6%,and the microstructure is lath-like,the yield strength gradually increases,while the tensile strength and elongation gradually decrease.After treated at 755℃for 15 min and 620℃for 30 min,the tested steel obtains optimal mechanical properties,with the tensile strength of 1087 MPa,elongation of 43.4%,and the product of strength and elongation of 47.2 GPa·%,which is attributed to that the moderate austenite stability can fully utilize the TRIP effect during the tensile process and improve the comprehensive mechanical properties of the steel.
作者
刘明珠
丁桦
邹宇明
Liu Mingzhu;Ding Hua;Zou Yuming(School of Materials Science and Engineering,Northeastern University,Shenyang Liaoning 110004,China;Key Laboratory of Lightweight Structural Materials of Liaoning Province,Northeastern University,Shenyang Liaoning 110004,China)
出处
《金属热处理》
北大核心
2025年第2期90-95,共6页
Heat Treatment of Metals
