长期时效处理对21-4NWNb钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2024.07.012

金属热处理 ›› 2024, Vol. 49 ›› Issue (7): 78-83.DOI: 10.13251/j.issn.0254-6051.2024.07.012

长期时效处理对21-4NWNb钢组织与性能的影响

赵守忠, 王守乾, 朱治愿, 闵亮, 徐超凡, 沈佳宝

江苏科技大学材料科学与工程学院, 江苏镇江 212000

收稿日期:2024-01-30 修回日期:2024-05-06 出版日期:2024-07-25 发布日期:2024-08-29
通讯作者: 朱治愿,教授,博士,E-mail: salanganezhu@163.com
作者简介:赵守忠(1997—),男,硕士研究生,主要研究方向为铁基高温合金热加工工艺,E-mail:rain2252413673@163.com。

Effect of long-term aging on microstructure and properties of 21-4NWNb steel

Zhao Shouzhong, Wang Shouqian, Zhu Zhiyuan, Min Liang, Xu Chaofan, Shen Jiabao

School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212000, China

Received:2024-01-30 Revised:2024-05-06 Online:2024-07-25 Published:2024-08-29

摘要/Abstract

摘要： 研究了经过标准热处理(1050 ℃×30 min+750 ℃×4 h)的21-4NWNb钢在750 ℃长期时效过程中的组织转变和力学性能变化情况。结果表明,长期时效过程中21-4NWNb钢的晶粒尺寸变化不明显,时效200 h时,组织中分布有少量规则块状M₂₃C₆型碳化物,时效500 h以后,晶内逐渐出现σ相(AB)。21-4NWNb钢硬度在200 h时最高为324 HV,最大抗拉强度为971 MPa,伸长率为22.2%。时效200 h以后,随着时效时间的延长,其硬度和抗拉强度均表现为逐渐下降的趋势;时效2000 h后钢的伸长率降至15%以下。

关键词: 21-4NWNb钢, 长期时效, σ相

Abstract: Microstructure evolution and mechanical properties change of the 21-4NWNb steel after standard heat treatment (1050 ℃×30 min+750 ℃×4 h) during long-term aging at 750 ℃ were studied. The results show that the grain size of 21-4NWNb steel does not change obvious during long-term aging. When aged for 200 h, a small amount of regular block M₂₃C₆ carbides are distributed in the steel. When the aging time extends to 500 h, σ phase (AB) gradually appears in the grain. The hardness of the 21-4NWNb steel reaches the highest value of 324 HV when aged for 200 h with a maximum tensile strength of 971 MPa and a elongation of 22.2%. With the prolong of aging time from 200 h, the hardness and tensile strength show a gradual decline, and the elongation of the steel drops below 15% after aging for 2000 h.

Key words: 21-4NWNb steel, long-term aging, σ-phase

中图分类号:

TG156.1

赵守忠, 王守乾, 朱治愿, 闵亮, 徐超凡, 沈佳宝. 长期时效处理对21-4NWNb钢组织与性能的影响[J]. 金属热处理, 2024, 49(7): 78-83.

Zhao Shouzhong, Wang Shouqian, Zhu Zhiyuan, Min Liang, Xu Chaofan, Shen Jiabao. Effect of long-term aging on microstructure and properties of 21-4NWNb steel[J]. Heat Treatment of Metals, 2024, 49(7): 78-83.

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长期时效处理对21-4NWNb钢组织与性能的影响

Effect of long-term aging on microstructure and properties of 21-4NWNb steel

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