金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 133-137.DOI: 10.13251/j.issn.0254-6051.2021.09.023

• 工艺研究 • 上一篇    下一篇

淬火温度对中合金马氏体耐磨铸钢组织和性能的影响

于洪军1, 陈正家1, 迟晓明1, 裴中正2, 程福超1, 许洁2, 王永金2   

  1. 1.鞍山钢铁集团有限公司大孤山球团厂, 辽宁 鞍山 114004;
    2.北京科技大学 材料科学与工程学院, 北京 100083
  • 收稿日期:2021-03-11 出版日期:2021-09-25 发布日期:2021-12-09
  • 通讯作者: 王永金,讲师,博士,E-mail:wangyongjin@ustb.edu.cn
  • 作者简介:于洪军(1966—),男,高级工程师,硕士,主要研究方向为钢铁材料的组织与性能,E-mail:991802665@qq.com。

Effect of quenching temperature on microstructure and mechanical properties of a medium alloy martensitic wear-resistant cast steel

Yu Hongjun1, Chen Zhengjia1, Chi Xiaoming1, Pei Zhongzheng2, Cheng Fuchao1, Xu Jie2, Wang Yongjin2   

  1. 1. Dagushan Pelleting Plant of Ansteel Group Co., Ltd., Anshan Liaoning 114004, China;
    2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2021-03-11 Online:2021-09-25 Published:2021-12-09

摘要: 对自行设计的矿山球磨机衬板用中合金马氏体耐磨铸钢在900、950、1000、1050、1100 ℃淬火后回火,研究了淬火温度对试验钢组织和性能的影响。试验结果表明,经过淬火、回火处理后的试验钢显微组织由板条马氏体和残留奥氏体组成。当保持回火温度250 ℃不变,随着淬火温度的升高,马氏体组织先变细密后又变粗大,抗拉强度、冲击性能及残留奥氏体含量均呈现先增大后减小的趋势,在1050 ℃淬火取得最优综合力学性能:抗拉强度1623 MPa,冲击性能14.4 J,此时试验钢的强化机理为孪晶马氏体和高密度位错缠结。通过冲击磨损试验解释了试验钢在该工艺下的磨损行为与磨损机理。

关键词: 马氏体, 耐磨铸钢, 中合金钢, 淬火, 显微组织

Abstract: A self-designed medium alloy martensitic wear-resistant cast steel was quenched at 900, 950, 1000, 1050, 1100 ℃ then tempered respectively, and the influence of quenching temperature on microstructure and mechanical properties of the tested steel was studied. The results indicate that the microstructure of the tested steel after quenching and tempering is composed of lath martensite and retained austenite. When the tempering temperature is kept constant at 250 ℃, with the increase of quenching temperature, the martensite structure first becomes finer and then coarser, and the tensile strength, impact properties and residual austenite content increase first and then decrease. The tested steel achieves the best comprehensive mechanical properties at 1050 ℃: tensile strength of 1623 MPa, impact property value of 14.4 J, the corresponding strengthening mechanism is twin martensite and high-density dislocation entanglement. And the wear behavior and the wear mechanism of the tested steel under this process are explained by the impact wear test.

Key words: martensite, wear-resistant cast steel, medium alloy steel, quenching, microstructure

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