快速回火对690 MPa级别工程机械用钢板组织和性能的影响

doi:10.13251/j.issn.0254-6051.2023.09.012

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 75-80.DOI: 10.13251/j.issn.0254-6051.2023.09.012

快速回火对690 MPa级别工程机械用钢板组织和性能的影响

李德明, 雷宁宁, 张晋刚, 宫涛, 周广浩

山推工程机械股份有限公司, 山东济宁 272073

收稿日期:2023-04-27 修回日期:2023-07-26 出版日期:2023-09-25 发布日期:2023-10-25
通讯作者: 张晋刚,高级工程师,E-mail:14802201@qq.com
作者简介:李德明(1983—),男,高级工程师,硕士,主要研究方向为工程机械制造技术,E-mail:lityjidian@163.com。

Effect of rapid tempering on microstructure and properties of 690 MPa grade steel plate for construction machinery

Li Deming, Lei Ningning, Zhang Jingang, Gong Tao, Zhou Guanghao

Shantui Construction Machinery Company Limited, Jining Shandong 272073, China

Received:2023-04-27 Revised:2023-07-26 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 利用OM、TEM和力学性能检测等方法研究了离线淬火后20、30、40 ℃/s三种不同回火加热速度及回火时间对690 MPa级工程机械用钢板内部析出物、组织以及性能的影响。结果表明,回火加热速度对钢板抗拉强度的影响较小,而屈服强度随保温时间的增加变化显著。钢板内部组织多为回火贝氏体+铁素体组织,保温时间延长,铁素体增多,保温15 min的试样性能稳定。通过对保温15 min的试样内部析出物的分析发现,随着回火加热速度增加,钢板内部碳化物的聚集现象先减小后增加,回火加热速度为30 ℃/s的试样综合力学性能最佳。

关键词: 工程机械, 淬火, 快速回火, 贝氏体, 析出

Abstract: Effects of three different tempering heating rates of 20, 30 and 40 ℃/s and tempering time after offline quenching on microstructure and mechanical properties of a 690 MPa grade steel plate for construction machinery were studied by using OM, TEM and mechanical properties tests. The results show that the tempering heating rate has little influence on the tensile strength of the steel plate, while the yield strength changes significantly with the increase of tempering holding time. The microstructure of the steel plate is bainite+ferrite mostly after tempering, with the prolonging of tempering holding time, and the amount of ferrite increases, especially, the specimen with 15 min of holding time shows stable properties. Through analysis of the precipitates inside the specimen with 15 min of holding time, it is found that with the increase of tempering heating rate, the carbide aggregation phenomenon inside the steel plate first decreases and then increases, and the comprehensive mechanical properties of the specimen at 30 ℃/s is the best.

Key words: construction machinery, quenching, rapid tempering, bainite, precipitate

中图分类号:

TG156.6

李德明, 雷宁宁, 张晋刚, 宫涛, 周广浩. 快速回火对690 MPa级别工程机械用钢板组织和性能的影响[J]. 金属热处理, 2023, 48(9): 75-80.

Li Deming, Lei Ningning, Zhang Jingang, Gong Tao, Zhou Guanghao. Effect of rapid tempering on microstructure and properties of 690 MPa grade steel plate for construction machinery[J]. Heat Treatment of Metals, 2023, 48(9): 75-80.

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快速回火对690 MPa级别工程机械用钢板组织和性能的影响

Effect of rapid tempering on microstructure and properties of 690 MPa grade steel plate for construction machinery

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