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
王文龙 1孙立赢 2刘硕 3龙旦风 4张华伟 4殷福星2
作者信息
- 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
- 折叠
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.
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.
关键词
Mn-10Cu-4Cr合金/显微组织/力学性能Key words
Mn-10Cu-4Cr alloy/microstructure/mechanical properties引用本文复制引用
基金项目
广东省自然科学基金面上项目(2024A1515011287)
出版年
2024
NETL
NSTL
万方数据