TC4-DT激光熔丝增材制造微观组织与力学性能研究  

Microstructure and mechanical properties of TC4-DT produced by laser wire-feed additive manufacturing

作　　者：张大越 刘旭明 张建 李彬周 赵阳 王军生 Zhang Dayue;Liu Xuming;Zhang Jian;Li Binzhou;Zhao Yang;Wang Junsheng(Ansteel Beijing Research Institute,Beijing 102200,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102200

出　　处：《钢铁钒钛》2021年第6期97-101,共5页Iron Steel Vanadium Titanium

基　　金：国家重点研发计划资助项目(2017YFB1103703)。

摘　　要：激光熔丝增材制造技术在航空航天、海工船舶等领域应用前景广阔。针对TC4-DT材料,在初步优化的工艺参数下,通过激光熔丝增材制造技术制备金属试样,并对试样进行固溶-强化热处理,研究激光熔丝沉积态及热处理态的微观组织、缺陷及室温拉伸力学性能。研究发现,激光熔丝TC4-DT成形态组织为粗大的柱状晶及针状αʹ马氏体,热处理后转变为等轴晶与柱状晶的双相组织,马氏体分解为针状α+β双相组织,固溶-强化热处理后拉伸力学性能与锻件水平相当。Laser wire-feed metal additive manufacturing technology has a wide application prospect in aerospace,marine engineering and shipbuilding.In this paper,TC4-DT samples were prepared by the laser wire-feed additive manufacturing technology combined with solution strengthening heat treatment method,based on the initial optimized process parameters.The microstructure,defects and room temperature tensile mechanical properties of the samples at as-deposited state and heat-treated state were respectively studied.It is found that the morphology of as-deposited TC4-DT is composed of columnar grains and acicularαʹmartensite.After solution strengthening heat treatment,equiaxed and columnar dual phase structure is formed,andαʹmartensite is decomposed into acicular structure ofα+β.The tensile mechanical properties after heat treatment are equivalent to those of forgings.

关 键 词：TC4-DT 激光熔丝增材制造 αʹ马氏体 固溶强化热处理 

分 类 号：TF823[冶金工程—有色金属冶金] TG115[金属学及工艺—物理冶金]