激光熔丝Ti6Al4V合金成形工艺、微观组织及强韧性研究  

Forming process,microstructure,strength and toughness of Ti6Al4V alloy by laser wire-feed additive manufacturing

作　　者：张大越 伍新泽 王一甲 司姗姗 姜圆博 李彬周 姜风春 Zhang Dayue;Wu Xinze;Wang Yijia;Si Shanshan;Jiang Yuanbo;Li Binzhou;Jiang Fengchun(Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China;Harbin Engineering University,Harbin 150001,Heilongjiang,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102200 [2]哈尔滨工程大学,黑龙江哈尔滨150001

出　　处：《钢铁钒钛》2024年第1期49-56,共8页Iron Steel Vanadium Titanium

基　　金：国家重点研发计划资助项目(2017YFB1103703)。

摘　　要：采用激光熔丝增材制造技术制备了单道多层的Ti6Al4V合金试样,系统研究了激光功率、扫描速度及送丝速度对Ti6Al4V合金的组织形貌、拉伸性能和冲击性能的影响。单道多层沉积试样的组织由马氏体α'、α集束和网篮状α构成。激光功率提高使β晶粒尺寸增大和马氏体α'分解程度增加,激光功率从3 000 W提升至3 500 W时试样抗拉强度下降了约4%,但延伸率上升了50%,冲击韧性提高了约6%。送丝速度的提高增大了试样的β晶粒平均尺寸,随着送丝速度从10 mm/s增加至30 mm/s,抗拉强度下降了2%,延伸率提高了67%,冲击韧性提高了11%。扫描速度提高会增加试样内的未熔合缺陷和残留马氏体α',扫描速度6 mm/s试样相比扫描速度4 mm/s的试样延伸率提高了约45%,抗拉强度下降了2%,冲击韧性提高了11%。In this paper,single-pass multi-layer Ti6Al4V alloy specimens were prepared by laser wire-feed additive manufacturing technology.The effects of laser power,scanning speed and wire feeding speed on the microstructure,tensile properties and impact properties of Ti6Al4V alloy were systematically studied.The microstructure of single-pass multi-layer deposition samples is composed of martensiteα',αbundle and basket-weave microstructure.The increase of laser power increases theβgrain size and the decomposition degree of martensiteα'.When the laser power increases from 3000 W to 3500 W,the tensile strength of the sample decreases by about 4%,the elongation increases by 50%,and the impact toughness increases by about 6%.With increasing wire feeding speed,the average size of theβgrains of the sample increases.As the wire feeding speed increases from 10 mm/s to 30 mm/s,the tensile strength decreases by 2%,the elongation increases by 67%,and the impact toughness increases by 11%.When the scanning speed increases,the lack-of-fusion and residual martensiteα'in the sample increases.Compared with the sample with a scanning speed of 4 mm/s,the elongation rate of the sample with a scanning speed of 6 mm/s increases by about 45%,the tensile strength decreases by 2%,and the impact toughness increases by 11%.

关 键 词：TI6AL4V 激光熔丝增材制造 激光功率 扫描速度 送丝速度 拉伸性能 冲击性能 

分 类 号：TF823[冶金工程—有色金属冶金]