固溶时效处理对21-4NWNb合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2024.05.014

金属热处理 ›› 2024, Vol. 49 ›› Issue (5): 88-93.DOI: 10.13251/j.issn.0254-6051.2024.05.014

固溶时效处理对21-4NWNb合金组织与性能的影响

臧凯, 王守乾, 朱治愿

江苏科技大学材料科学与工程学院, 江苏镇江 212000

收稿日期:2023-07-23 修回日期:2024-03-07 出版日期:2024-05-25 发布日期:2024-06-28
通讯作者: 朱治愿,教授,硕士,E-mail:salanganezhu@163.com
作者简介:臧凯(1998—),男,硕士研究生,主要研究方向为镍基高温合金,E-mail:510481978@qq.com。

Effect of solution treatment and aging on microstructure and properties of 21-4NWNb alloy

Zang Kai, Wang Shouqian, Zhu Zhiyuan

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

Received:2023-07-23 Revised:2024-03-07 Online:2024-05-25 Published:2024-06-28

摘要/Abstract

摘要： 利用XSL-4-12箱式电阻炉、ZEISS金相显微镜、ZEISS Merlin CoMpact场发射扫描电镜、KB 30S全自动硬度测量系统、CMT5305电子万能试验机及JEM-2100F场发射透射电镜,研究了固溶-时效处理对21-4NWNb合金组织与性能的影响。结果表明:固溶处理能有效改善合金的晶粒组织,当固溶温度在1150~1200 ℃时,合金内大量的碳化物几乎都已经固溶到奥氏体基体中,Nb(C,N)相即使在固溶温度为1200 ℃时也无法完全溶解;合金的硬度随固溶温度的升高呈下降趋势,不同工艺时效处理后合金的晶粒尺寸基本不变;在较高时效温度(650~800 ℃)下,合金硬度随着时效温度的升高呈先上升后下降的趋势。1150 ℃×0.5 h固溶+750 ℃×4 h时效后,21-4NWNb合金的抗拉强度达到了1042 MPa,且合金内部存在与Fe基体保持着(110)_WN//(220)_γ位向关系的WN析出相。

关键词: 21-4NWNb合金, 固溶时效, 组织, 性能

Abstract: Effects of solution treatment and aging on microstructure and properties of 21-4NWNb alloy were investigated by means of XSL-4-12 box resistance furnace, ZEISS metallographic microscope, ZEISS Merlin Compact field emission scanning electron microscope, KB 30S automatic hardness test system, CMT5305 electronic universal testing machine, and JEM-2100F field emission transmission electron microscope. The results show that solution treatment can effectively improve the grain structure of the alloys. When the solution treatment temperature is in the range of 1150-1200 ℃, a large amount of carbides in the alloy almost completely dissolve into the austenite matrix, and the Nb(C, N) phases cannot completely dissolve even at the solution treatment temperature of 1200 ℃. The hardness of the alloy decreases with the increase of solution treatment temperature. The grain size of the alloy remains basically unchanged after different aging treatments. At higher aging temperatures (650-800 ℃), hardness of the alloy shows a trend of first increasing and then decreasing with the increase of aging temperature. After solution treatment at 1150 ℃ for 0.5 h and then aging at 750 ℃ for 4 h, the tensile strength of the 21-4NWNb alloy reaches 1042 MPa, and there is a (110)_WN//(220)_γ relationship between the WN precipitate phases in the alloy and the Fe matrix.

Key words: 21-4NWNb alloy, solution treatment and aging, microstructure, properties

中图分类号:

TG156.92

臧凯, 王守乾, 朱治愿. 固溶时效处理对21-4NWNb合金组织与性能的影响[J]. 金属热处理, 2024, 49(5): 88-93.

Zang Kai, Wang Shouqian, Zhu Zhiyuan. Effect of solution treatment and aging on microstructure and properties of 21-4NWNb alloy[J]. Heat Treatment of Metals, 2024, 49(5): 88-93.

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固溶时效处理对21-4NWNb合金组织与性能的影响

Effect of solution treatment and aging on microstructure and properties of 21-4NWNb alloy

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