硼对激光增材制造TC4微观组织及力学性能的影响  

Effect of B on Microstructure and Tensile Properties of Laser Additive Manufactured TC4 Alloy

作　　者：齐振佳 张晓星 王豫跃[1] 霍浩 王宏 张金智 张安峰[2] Qi Zhenjia;Zhang Xiaoxing;Wang Yuyue;Huo Hao;Wang Hong;Zhang Jinzhi;Zhang Anfeng(State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an,Shaanxi 710049,China;State Key Laboratory for Manufacturing Systems Engineering,Xi'an Jiaotong University,Xi'an,Shaanxi 710049,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]西安交通大学机械制造系统工程国家重点实验室,陕西西安710049

出　　处：《中国激光》2020年第6期116-122,共7页Chinese Journal of Lasers

基　　金：国家重点研发计划(2016YFB1100102);国家自然科学基金(51775417)。

摘　　要：在TC4粉中加入不同含量的硼粉进行激光增材制造试验,研究了硼对激光增材制造TC4钛合金微观组织及力学性能的影响。结果表明:添加微量硼可以有效细化原始柱状晶和晶内的板条α相;当硼的质量分数为0.05%时,原始β柱状晶的生长被限制,柱状晶的宽度明显减小;当硼的质量分数为0.1%时,原始柱状晶大量转变为等轴晶,晶内板条α集束的尺寸减小;对比没有添加硼的激光增材制造TC4,TC4-0.05B的塑性明显提高,但强度的变化不明显;沉积态和固溶时效态TC4-0.05B力学性能的各向异性都较小。In this study,B powders of different contents are added into TC4 powders and the laser additive manufacturing(LAM)experiment is conducted.Influence of the addition of B on the microstructure and mechanical properties of samples is investigated.Results show that the addition of trace B can effectively refine the microstructure size of TC4 alloy produced using LAM.The growth of the prior-βgrains in LAM-TC4 alloy is restrained by an addition of 0.05%B,and the grain width is significantly decreased.An addition of 0.1%B can promote the transformation from coarse prior-βcrystals to equiaxed crystals and result in a great reduction of the size ofαbundle.Plasticity of the TC4-0.05B alloy is evidently improved compared with that of the boron-free TC4 alloy,whereas the change in the strength is not significant.Anisotropy of the as-deposited TC4-0.05B alloy and TC4-0.05B-solution aging is low.

关 键 词：激光技术 激光增材制造 晶粒细化 钛合金 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]