金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 156-163.DOI: 10.13251/j.issn.0254-6051.2021.08.029

• 工艺研究 • 上一篇    下一篇

新型刀具用钢的热处理工艺及微观组织

段文峰1,2,3, 石全强2,3, 李积回4, 何玲4, 范倚豪4, 邵品1, 严伟2,3   

  1. 1.辽宁科技大学 材料与冶金学院, 辽宁 鞍山 114051;
    2.中国科学院金属研究所 师昌绪先进材料创新中心, 辽宁 沈阳 110016;
    3.中国科学院金属研究所 中国科学院核用材料与安全评价重点实验室, 辽宁 沈阳 110016;
    4.阳江十八子刀剪制品有限公司, 广东 阳江 529500
  • 收稿日期:2021-04-05 出版日期:2021-08-25 发布日期:2021-12-09
  • 通讯作者: 石全强,副研究员,E-mail:qqshi12b@imr.ac.cn
  • 作者简介:段文峰(1995—),男,硕士研究生,主要研究方向为刀具用钢的微观组织和性能测试,E-mail:duanwff@163.com。
  • 基金资助:
    阳江市科技局(2019016);中国科学院创新促进会项目(2017233)

Heat treatment process and microstructure of a new SIMR tool steel

Duan Wenfeng1,2,3, Shi Quanqiang2,3, Li Jihui4, He Ling4, Fan Yihao4, Shao Pin1, Yan Wei2,3   

  1. 1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan Liaoning 114051, China;
    2. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China;
    3. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China;
    4. Yangjiang Shibazi Knife and Scissors Products Co., Ltd., Yangjiang Guangdong 529500, China
  • Received:2021-04-05 Online:2021-08-25 Published:2021-12-09

摘要: 采用不同淬回火工艺系统地研究了一种高碳高铬马氏体刀具用钢—SIMR的热处理工艺和微观组织,通过XRD、SEM和TEM等表征方法,分析测试了不同淬火温度和回火温度下SIMR刀具用钢的微观组织、碳化物形貌与分布和显微硬度等,获得了SIMR的最佳热处理工艺。结果表明,SIMR刀具用钢的晶粒尺寸随着淬火温度的升高而逐渐增大,冶炼凝固过程中析出的富铬M7C3型一次碳化物随着淬火温度的提高而逐渐回溶,显微硬度总体上呈现先升高后降低的趋势,回火温度在150~300 ℃间,SIMR刀具用钢的最佳热处理工艺为在1050 ℃淬火处理20 min,油冷,然后在150 ℃回火处理90 min,空冷。

关键词: SIMR刀具用钢, 热处理工艺, 显微组织, 硬度

Abstract: The heat treatment process and microstructure of the SIMR, a high carbon and high chromium martensitic tool steel, were systematically studied by different quenching and tempering processes. Microstructure, morphologies and distribution of carbides and micro-hardness of the SIMR tool steel were researched by means of XRD, SEM, and TEM characterization methods, and the optimum heat treatment of the SIMR tool steel was obtained. The tested results show that the grain size of the SIMR tool steel gradually grows with the increase of quenching temperature, and the chromium-rich M7C3 type primary carbide which forms during the smelting solidification process, gradually re-dissolves with the increase of quenching temperature, and the micro-hardness increases first and then decreases. When the tempering temperature is between 150 ℃ and 300 ℃, the optimum heat treatment process for the SIMR tool steel is quenching at 1050 ℃ for 20 min, and then oil quenching, finally tempering at 150 ℃ for 90 min and then air cooling.

Key words: SIMR tool steel, heat treatment process, microstructure, hardness

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