时效处理对Mn-10Cu-4Cr合金显微组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.10.029

金属热处理 ›› 2024, Vol. 49 ›› Issue (10): 175-178.DOI: 10.13251/j.issn.0254-6051.2024.10.029

时效处理对Mn-10Cu-4Cr合金显微组织与力学性能的影响

王文龙¹, 孙立赢², 刘硕³, 龙旦风⁴, 张华伟⁴, 殷福星²

1.中海石油(中国)有限公司湛江分公司, 广东湛江 524057;
2.广东省科学院新材料研究所, 广东广州 510650;
3.河北工业大学材料科学与工程学院天津市材料层状复合与界面控制技术重点实验室, 天津 300130;
4.广东省科学院智能制造研究所, 广东广州 510070

收稿日期:2024-05-13 修回日期:2024-08-29 出版日期:2024-11-28 发布日期:2024-11-28
通讯作者: 孙立赢,工程师,博士,E-mail: sunliying@gdinm.com
作者简介:王文龙,高级工程师,主要研究方向为海洋工程用材料,E-mail: wenlong19832020@163.com。
基金资助:
广东省自然科学基金面上项目(2024A1515011287)

Effect of aging treatment on microstructure and mechanical properties of Mn-10Cu-4Cr alloy

Wang Wenlong¹, Sun Liying², Liu Shuo³, Long Danfeng⁴, Zhang Huawei⁴, Yin Fuxing²

1. Zhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, China;
2. Institute of New Materials, Guangdong Academy of Sciences, Guangzhou Guangdong 510650, China;
3. Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;
4. Institute of Intelligent Manufacturing, Guangdong Academy of Sciences, Guangzhou Guangdong 510070, China

Received:2024-05-13 Revised:2024-08-29 Online:2024-11-28 Published:2024-11-28

摘要/Abstract

摘要： 对Mn-10Cu-4Cr合金进行850 ℃固溶40 min和不同时效处理(400~600 ℃时效8 h和440 ℃时效0~120 h),研究了合金在时效后的组织结构演变和力学性能。结果表明,Mn-10Cu-4Cr合金经固溶处理后的基体TEM组织呈条纹状形貌,条纹宽度约为1.5 nm,还存在无条纹形貌的富铜区,表明由于调幅分解的发生导致了合金成分的不均匀性。此外,组织中还含有α-Mn析出相,随着时效温度的增加或者时效时间的延长,合金的晶粒尺寸无明显变化,而强度和硬度明显增加,伸长率下降,其原因是时效处理导致了富铜纳米颗粒的形成、长大、粗化以及α-Mn相在晶粒内部以及晶粒之间析出。

关键词: Mn-10Cu-4Cr合金, 显微组织, 力学性能

Abstract: Microstructure evolution and mechanical properties of Mn-10Cu-4Cr alloy after solution treatment at 850 ℃ for 40 min and aging at 400-600 ℃ for 8 h and at 440 ℃ for 0-120 h were studied. The results show that the matrix of the alloy after solution treatment shows stripe morphology with width of about 1.5 nm under TEM, and there is a copper-rich region without stripe morphology, indicating that the occurrence of spinodal decomposition leads to the inhomogeneity of alloy composition. Moreover, there is also α-Mn precipitated phase in the microstructure. With the increase of aging temperature and the extension of aging time, the grain size of the alloy changes little, while the hardness and strength increase significantly and the elongation decreases, which is due to the formation, growth and coarsening of Cu-rich nanoparticles, and the formation of the α-Mn phase within and between grains caused by aging treatment.

Key words: Mn-10Cu-4Cr alloy, microstructure, mechanical properties

中图分类号:

TG132

王文龙, 孙立赢, 刘硕, 龙旦风, 张华伟, 殷福星. 时效处理对Mn-10Cu-4Cr合金显微组织与力学性能的影响[J]. 金属热处理, 2024, 49(10): 175-178.

Wang Wenlong, Sun Liying, Liu Shuo, Long Danfeng, Zhang Huawei, Yin Fuxing. Effect of aging treatment on microstructure and mechanical properties of Mn-10Cu-4Cr alloy[J]. Heat Treatment of Metals, 2024, 49(10): 175-178.

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时效处理对Mn-10Cu-4Cr合金显微组织与力学性能的影响

Effect of aging treatment on microstructure and mechanical properties of Mn-10Cu-4Cr alloy

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