Al-Mn-Sc合金的选区激光熔化工艺优化及室温与高温力学性能研究

Optimization of Selective Laser Melting Process for Al-Mn-Sc Alloy and Its Mechanical Properties at Room and High Temperature

熊孝经 ¹吴晓鹏 ²张唯 ³汤华平¹

扫码查看

作者信息

1. 季华实验室,广东佛山 528200
2. 季华实验室,广东佛山 528200;东北大学,辽宁沈阳 110819
3. 广东峰华卓立股份有限公司,广东佛山 528200
折叠

摘要

通过探究能量密度对Al-4.5Mn-1.5Mg-0.6Sc-0.2Zr(wt.%)合金致密度的影响,优化其成形工艺,并进一步分析该合金在时效过程中组织变化及其室温与高温力学性能.结果表明:随着能量密度增大,合金致密度先增后减.当能量密度为77.6 J/mm3时,即激光功率275 W、扫描速率985 mm/s、扫描间距0.12 mm、层厚0.03 mm,可获得致密的、缺陷少的合金材料.沉积态合金显微组织由等轴晶和柱状晶组成,周围分布着细小富Mn相;300℃/5 h时效后,晶内析出大量纳米Al3(Sc,Zr)相.同时,时效后合金表现出优异的室温与高温力学性能,其室温屈服强度、抗拉强度和伸长率分别是500 MPa、536 MPa和12.3%,高温(250℃)屈服强度、抗拉强度和伸长率分别为224 MPa、299 MPa和11.5%.

Abstract

This article examines the influence of energy density on the density of the Al-4.5Mn-1.5Mg-0.6Sc-0.2Zr alloy,introduces an improved forming methodology,and examines microstructural evolution and mechanical properties at room and high temperature.The results show that as energy density rises,the alloy density initially escalates before subsiding.When the energy density reached 77.6 J/mm3(laser power 275 W,scanning speed 985 mm/s,scanning pitch 0.12 mm,and layer thickness 0.03 mm),defect-free dense alloys were realized.The as-deposited microstructure consists of equiaxed grains and columnar grains,encircled by Mn-rich phases.After aging treated at 300℃for 5 h,a large quantity of nano-sized Al3(Sc,Zr)phase precipitates.Simultaneously,the aged alloy demonstrates outstanding mechanical properties,exhibiting room temperature yield strength,tensile strength,and elongation of 502.3 MPa,536.3 MPa,and 12.3%,respectively.At elevated temperatures(250℃),these remain at 223.5 MPa,299.1 MPa,and 11.5%,respectively.

关键词

选区激光熔化/Al-Mn-Sc/高温力学性能

Key words

selective laser melting/Al-Mn-Sc/high temperature mechanical properties

引用本文复制引用

基金项目

季华实验室自立项目(X200171TM200)

出版年

2024

铸造

沈阳铸造研究所中国机械工程学会铸造分会

铸造

CSTPCD

影响因子：0.499

ISSN：1001-4977

参考文献量12

段落导航