摘要
增材制造钛合金因具有外延生长的粗大柱状β晶而导致显著的力学各向异性。合金成分调控作为实现增材制造钛合金从柱状晶向等轴晶转变以改善其各向异性的重要手段,由于伴随着脆性金属间化合物的析出,致使目前存在全等轴化和良好塑性不可兼得的矛盾。不同于常规的单一元素合金化,本文借助相图计算,通过Ni、Fe和B的复合添加,实现了激光直接能量沉积Ti6242S-0.75Ni-1.65Fe-0.05B合金β晶粒的等轴化,并避免了金属间化合物的形成。室温拉伸性能表明,沉积态Ti6242S-0.75Ni-1.65Fe-0.05B合金的力学性能各向异性被基本消除,且横纵方向的强度和塑性均高于Ti6242S合金。
Due to the epitaxial growth of coarse columnar B grains,additive manufactured titanium alloys show significant mechanical anisotropy.Composition regulation is an important means to improve the anisotropy of additive manufectured titanium alloys through a columnar to equiaxed transition.Because of the precipitation of brittle intermetallic compounds,there exists a contradiction between fully equiaxed grains and good plasticity.Different from conventional single element alloying,the full-equiaxed 0 grains of Ti6242S-0.75Ni-l.65-Fe-0.05B alloy are achieved by laser direct energy deposition(DED)with additions of Ni,Fe and B elements through calphad,and the formation of intermetallic compounds is avoided.The tensile properties at room temperature show that the mechanical anisotropy of the Ti6242S-0.75-Ni-1.65Fe-0.05B alloy is basically eliminated,and the strength and plasticity of the Ti6242S-0.75-Ni-l.65Fe-0.05B alloy are higher than those of the Ti6242S alloy in the transverse and longitudinal directions.
作者
袁璐恺
王理林
丁汉林
薛爱堂
林鑫
黄卫东
YUAN Lukai;WANG Lilin;DING Hanlin;XUE Aitang;LIN Xin;HUANG Weidong(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design,Northwestern Polytechnical University,Xfan 710072,China)
出处
《铸造技术》
CAS
2023年第3期233-239,共7页
Foundry Technology
基金
凝固技术国家重点实验室自主研究课题(2022-TS-02)
国家自然基金青年项目(51701155)
国家重点研发计划(2016YFB1100104)。
关键词
激光直接能量沉积
成分调控
微观组织
力学性能
各向异性
laser direct energy deposition
composition regulation
microstructure
mechanical performance
anisotropy
