17-4PH不锈钢480 ℃时效组织的动态演变规律

doi:10.13251/j.issn.0254-6051.2020.08.005

金属热处理 ›› 2020, Vol. 45 ›› Issue (8): 22-26.DOI: 10.13251/j.issn.0254-6051.2020.08.005

17-4PH不锈钢480 ℃时效组织的动态演变规律

解文飞¹, 吴文云², 汪东红², 杨连金³, 吴日铭¹

1.上海工程技术大学材料工程学院, 上海 201600;
2.上海市先进高温材料及其精密成形重点实验室, 上海 201100;
3.浙江青山钢铁股份有限公司, 浙江丽水 323900

收稿日期:2020-01-22 出版日期:2020-08-25 发布日期:2020-09-07
通讯作者: 吴日铭,副教授,E-mail:15821598182@163.com
作者简介:解文飞(1992—),男,硕士研究生,主要研究方向为模具钢的强化机理,E-mail:370094079@qq.com

Microstructure dynamic evolution of 17-4PH stainless steel aged at 480 ℃

Xie Wenfei¹, Wu Wenyun², Wang Donghong², Yang Lianjin³, Wu Riming¹

1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201600, China;
2. Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201100, China;
3. Zhejiang Tsingshan Steel Co. , Ltd. , Lishui Zhejiang 323900, China

Received:2020-01-22 Online:2020-08-25 Published:2020-09-07

摘要/Abstract

摘要： 将17-4PH不锈钢锻棒固溶处理后油冷,然后选择在最佳的时效温度480 ℃时效保温0～5 h后空冷。通过光学显微镜(OM)、超景深显微镜、XRD、显微硬度仪等测试方法观察固溶、时效过程的组织演变和分析其沉淀硬化机理;采用电阻仪间接测试ε-Cu相动态时效析出过程对电阻的影响;并利用摩擦磨损试验机测试其耐磨性能。研究发现:17-4PH不锈钢固溶和时效过程没有残留奥氏体和逆转变奥氏体出现,热处理后出现板条状和块状两种马氏体形态,板条状马氏体硬度高于块状马氏体,随着时效时间的延长,两种马氏体硬度同步上升,时效析出明显提高了固溶态组织的硬度;时效2.0～2.5 h附近强化效果和耐磨性能最弱,可能与ε-Cu 相长大及与位错交互作用有关;硬度随时效时间的变化趋势与电阻正好相反。

关键词: 17-4PH不锈钢, 马氏体, 显微组织, 电阻, 硬度

Abstract: 17-4PH stainless steel forged rod was solid solution treated with oil cooling, and aged at 480 ℃ for 0-5 h with air cooling. Microstructure evolution and mechanism of precipatate hardening in the aging process were observed and analyzed by means of optical microscopy (OM), ultra-depth-of-field microscopy, XRD and microhardness tester. The effect of dynamic aging precipitation process of ε-Cu phase on electric resistance was indirectly tested by resistor, and the wear resistance was tested by friction and wear tester. The results show that there are no retained austenite and reversed austenite observed in the solid solution and aging process of the 17-4PH stainless steel. After heat treatment, there are two martensite morphologies i.e. lath and block. The hardness of lath martensite is higher than that of block one. With the prolongation of aging time, the hardness of both martensite increases synchronously. Aging precipitation obviously increases the hardness of solution treated structure. Aging for 2.0-2.5 h, the hardening effect and wear resistance are the weakest in the vicinity, which may be related to the growth of ε-Cu phase and the interaction with dislocation. Meanwhile, the change trend of hardness is opposite to that of resistance.

Key words: 17-4PH stainless steel, martensite, microstructure, electric resistance, hardness

中图分类号:

TG178

解文飞, 吴文云, 汪东红, 杨连金, 吴日铭. 17-4PH不锈钢480 ℃时效组织的动态演变规律[J]. 金属热处理, 2020, 45(8): 22-26.

Xie Wenfei, Wu Wenyun, Wang Donghong, Yang Lianjin, Wu Riming. Microstructure dynamic evolution of 17-4PH stainless steel aged at 480 ℃[J]. Heat Treatment of Metals, 2020, 45(8): 22-26.

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17-4PH不锈钢480 ℃时效组织的动态演变规律

Microstructure dynamic evolution of 17-4PH stainless steel aged at 480 ℃

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