金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 100-104.DOI: 10.13251/j.issn.0254-6051.2020.02.019

• 工艺研究 • 上一篇    下一篇

热处理工艺对51CrV4钢组织及性能的影响

张炜, 胥洲, 高东宏, 柳超   

  1. 中国第一汽车股份有限公司研发总院, 吉林 长春 130011
  • 收稿日期:2019-08-11 出版日期:2020-02-25 发布日期:2020-04-03
  • 作者简介:张 炜(1986—),男,工程师,主要研究方向为汽车金属材料、热处理工艺及失效分析等,联系电话:0431-85789466,E-mail:zhangwei3@faw.com.cn。

Effect of heat treatment process on microstructure and mechanical properties of 51CrV4 steel

Zhang Wei, Xu Zhou, Gao Donghong, Liu Chao   

  1. Research and Development Institute of China First Automobile Group Co., Ltd., Changchun Jilin 130011, China
  • Received:2019-08-11 Online:2020-02-25 Published:2020-04-03

摘要:

研究了淬火回火和等温淬火热处理工艺对51CrV4钢显微组织、力学性能及疲劳性能的影响。结果表明,与淬火回火的传统热处理工艺相比,51CrV4钢等温淬火热处理后显微组织为下贝氏体+马氏体+残留奥氏体的复相组织,抗拉强度、断后伸长率、断裂韧性及疲劳极限分别提高14%、24%、34%和15%,获得高强度、高塑性和高韧性的综合力学性能,以及优良的疲劳性能。

关键词: 51CrV4钢, 强韧性, 等温淬火, 断裂韧性, 疲劳性能

Abstract:

The effects of quenching+tempering and isothermal quenching on the microstructure, mechanical properties and fatigue properties of 51CrV4 steel were studied. The results show that compared with the traditional quenching+tempering process, the microstructure of the 51CrV4 steel after isothermal quenching treatment is multiphase of lower bainite+martensite+residual austenite, the tensile strength, elongation after fracture, fracture toughness and fatigue limit is increased by 14%, 24%, 34% and 15%, respectively. The comprehensive mechanical properties of high strength, high plasticity, high toughness and excellent fatigue performance are obtained.

Key words: 51CrV4 steel, strength toughness, isothermal quenching, fracture toughness, fatigue performance

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