回火温度对NM500耐磨钢组织和性能的影响

doi:10.13251/j.issn.0254-6051.2022.10.025

金属热处理 ›› 2022, Vol. 47 ›› Issue (10): 154-159.DOI: 10.13251/j.issn.0254-6051.2022.10.025

回火温度对NM500耐磨钢组织和性能的影响

朱震宇, 吴志方, 吴润

武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室, 湖北武汉 430081

收稿日期:2022-04-28 修回日期:2022-08-20 出版日期:2022-10-25 发布日期:2022-12-15
通讯作者: 吴润,教授,博士,E-mail:runwu@wust.edu.cn
作者简介:朱震宇(1996—),男,硕士研究生,主要研究方向为耐磨钢的微观组织和摩擦性能,E-mail:zhzy0811@163.com。

Effect of tempering temperature on microstructure and properties of NM500 wear-resistant steel

Zhu Zhenyu, Wu Zhifang, Wu Run

Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan Hubei 430081, China

Received:2022-04-28 Revised:2022-08-20 Online:2022-10-25 Published:2022-12-15

摘要/Abstract

摘要： 采用光学显微镜(OM)、扫描电镜(SEM)和材料表面综合性能测试仪等研究了回火温度对NM500低合金高强度耐磨钢的显微组织、力学性能和耐磨性能的影响。结果表明,NM500钢经淬火+回火处理后得到典型的回火马氏体组织,回火温度的升高使得固溶在马氏体板条中的过饱和碳原子逐渐析出,而碳化物聚集长大导致钢的硬度和低温冲击性能明显下降。NM500钢在200 ℃回火后的硬度和-20 ℃低温冲击吸收能量分别为513 HBW和44.40 J,耐磨性能最佳。低温回火(200、250 ℃)时少量细小弥散的过饱和碳原子析出改善了钢的耐磨性,300 ℃及以上回火时聚集粗化的短棒状渗碳体会降低基体的硬度,导致钢的耐磨性不断降低,磨损机制由磨粒磨损向粘着磨损转变。

关键词: NM500耐磨钢, 回火温度, 显微组织, 力学性能, 干摩擦性能

Abstract: Effect of tempering temperature on microstructure, mechanical properties and wear resistance of NM500 low alloy high strength wear-resistant steel was studied by means of optical microscope (OM), scanning electron microscope (SEM) and material surface comprehensive performance tester. The results show that the typical tempered martensite structure is obtained in the NM500 steel after quenching and tempering. With the increase of tempering temperature, supersaturated carbon atoms in martensite laths are gradually precipitated, the hardness and low temperature impact absorbed energy of the NM500 steel decrease obviously after the carbides grow up. The hardness and impact absorbed energy at -20 ℃ of the NM500 steel after tempering at 200 ℃ are 513 HBW and 44.40 J, respectively, and the wear resistance is the best. When tempering at low temperature(200 and 250 ℃), a small amount of fine dispersed supersaturated carbon atoms precipitate, which improves the wear resistance of the steel. When tempering at 300 ℃ and above, the aggregated coarsened short rod cementite will reduce the hardness of the matrix, resulting in a continuous decrease in the wear resistance of the steel. The wear mechanism changes from abrasive wear to adhesive wear.

Key words: NM500 wear-resistant steel, tempering temperature, microstructure, mechanical properties, dry friction property

中图分类号:

TG161

朱震宇, 吴志方, 吴润. 回火温度对NM500耐磨钢组织和性能的影响[J]. 金属热处理, 2022, 47(10): 154-159.

Zhu Zhenyu, Wu Zhifang, Wu Run. Effect of tempering temperature on microstructure and properties of NM500 wear-resistant steel[J]. Heat Treatment of Metals, 2022, 47(10): 154-159.

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回火温度对NM500耐磨钢组织和性能的影响

Effect of tempering temperature on microstructure and properties of NM500 wear-resistant steel

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