热处理对激光选区熔化TA15组织性能的影响  

Effect of heat treatment on microstructure and properties of selective laser melting TA15 alloy

作　　者：王猛 赵琳瑜 刘喜旺 陈志旋 张立平 吴军 WANG Meng;ZHAO Linyu;LIU Xiwang;CHEN Zhixuan;ZHANG Liping;WU Jun(Xi’an Aerospace Power Machinery Co.,Ltd.,Xi’an 710038,China;State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710038,China)

机构地区：[1]西安航天动力机械有限公司,西安710038 [2]西安交通大学金属材料强度国家重点实验室,西安710038

出　　处：《材料工程》2025年第3期125-134,共10页Journal of Materials Engineering

基　　金：国家重点研发计划项目(2018YFB1105800)。

摘　　要：为了提高选区激光熔化TA15合金试样的综合力学性能,本研究开展了选区激光熔化(selected laser melting,SLM)TA15合金在800℃+空冷、950℃+空冷和1050℃+空冷退火条件下的组织和力学性能研究。利用电子背散射衍射表征了不同状态TA15合金组织结构特征。结果表明,800℃和950℃热处理未明显改变α相的取向和织构,呈现网篮组织结构特征;1050℃热处理后,沿[0001]方向出现最大强度为9.18的织构,呈现魏氏体组织特征。随着退火温度的升高,α′/α相的宽度逐渐增加,长宽比先上升后下降,α′/α相内几何必要位错密度逐渐降低。试样维氏硬度值先下降、后上升,未热处理态试样维氏硬度值最大,为(397.2±10)HV。随着退火温度的升高,TA15试样强度逐渐下降,伸长率先上升后下降。未热处理态拉伸试样呈现混合断裂特征;800℃和900℃热处理试样呈现塑性断裂特征;1050℃热处理试样为脆性断裂。To improve the comprehensive mechanical properties of selective laser melting(SLM)TA15 alloy,the microstructure and mechanical properties of SLM TA15 alloy are studied under annealing conditions of 800℃+air cooling,950℃+air cooling,and 1050℃+air cooling.The microstructure characteristics of TA15 alloy under annealing conditions are characterized by electron backscatter diffraction.The results show that the orientation and texture of the α phase are not changed after the heat treatment at 800℃ or 950℃,showing the characteristics of a net basket structure.After the heat treatment at 1050℃,the texture with the maximum strength of 9.18 appears along the direction[0001],showing the characteristic of the weistenite structure.With the increase of annealing temperature:the width of both α'and α phase increases gradually;the aspect ratio of bothα'andαphase increases first and then decreases;the geometrically necessary dislocation density of bothα'andαphase decreases gradually;the Vickers hardness of the sample decreases first and then increases,with the highest Vickers hardness of(397.2±10)HV for the unheat treated sample;the strength of TA15 sample decreases gradually;and the elongation increases first and then decreases.After tensile tests,the unheat treated samples show mixed fracture characteristics,the samples treated at 800℃ and 900℃show plastic fracture characteristics,and the sample treated at 1050℃ show brittle fracture characteristics.

关 键 词：选区激光熔化 热处理 TA15 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TB31[金属学及工艺—金属材料]