配分温度和时间对22SiMnCrNi2Mo钢组织和性能的影响
2021-07-22陈涛王笃雄丁晓亮
陈涛 王笃雄 丁晓亮



摘 要:本文通过拉伸试验、显微组织观察以及物相分析等方法,研究了配分温度和配分时间对22SiMnCrNi2Mo钢抗拉强度与断后伸长率的影响。结果表明,淬火配分后组织主要为板条状马氏体和少量残余奥氏体。随着配分温度的升高,抗拉强度显著降低,断后伸长率先提高后降低;随着配分时间的延长,抗拉强度降低,而伸长率提高。
关键词:22SiMnCrNi2Mo钢;配分温度;配分时间;残余奥氏体
中图分类号:TG161文献标识码:A文章编号:1003-5168(2021)08-0035-03
Effect on Microstructure and Properties of 22SiMnCrNi2Mo
Steel with Partitioning Temperature and Time
CHEN Tao1 WANG Duxiong1 DING Xiaoliang2
(1.School of Mechanical Engineering Yangzhou University,Yangzhou Jiangsu 225127;
2.Jiangsu Jiekai Electrical Equipment Co., Ltd.,Yangzhou Jiangsu 225233)
Abstract: In this paper, the effects of partitioning temperature and partitioning time on the tensile strength and elongation after breaking of 22SiMnCrNi2Mo steel are studied through tensile test, microstructure observation and phase analysis..The results show that the microstructure after quenching and partitioning is mainly lath martensite and a small amount of retained austenite.With the increase of partitioning temperature, the tensile strength decreases significantly, and the elongation increases first and then decreases,and the tensile strength decreases with the extension of partitioning time. The elongation increases.
Keywords: 22SiMnCrNi2Mo Steel;partitioning temperature; partition time; retained austenite
淬火配分[1](Quenching and Partitioning,Q&P)工藝是将试验钢加热奥氏体化后冷却到马氏体开始转变温度和终了转变温度之间等温,碳由马氏体扩散到残余奥氏体,使残余奥氏体稳定而提高塑性的工艺。郭艳辉等[2]研究低碳硅锰钢I&Q&P工艺发现,纳米级残余奥氏体分布在马氏体板条之间和原奥氏体晶界处。陈连生等[3]研究配分温度和时间对低碳硅锰钢组织与性能的影响发现,随着配分的时间延长,抗拉强度和塑形都呈现下降趋势,而随着配分温度的升高,强度和塑形先增加后减小。
22SiMnCrNi2Mo钢用在电力金具上已经获得了专利[4],其Si、Mn元素的含量也是Q&P工艺的适宜成分。能否通过Q&P工艺进一步改善其塑性,本文主要研究22SiMnCrNi2Mo钢在Ms点下上不同配分温度和时间对其组织与性能的影响。
1 实验材料
实验材料为22SiMnCrNi2Mo钢,其化学成分如表1所示。
2 热处理工艺
用JMatPro软件分析得出22SiMnCrNi2Mo钢奥氏体转变温度为845 ℃,马氏体开始转变温度为331 ℃。热处理工艺为将试验钢加热到880 ℃保温10 min完全奥氏体化后,淬火至180 ℃,然后分别放入200 、260 、320 ℃以及380 ℃进行配分,最后水淬至室温。……
