摘要
通过电弧增材制造原位制备高氧钛,并对高氧钛的成分偏析、显微组织和力学性能进行研究。结果表明,高氧钛试样的显微组织主要呈现为针状α相集束。随着氧含量的增加,试样针状α相逐渐变宽,集束尺寸变大。受氧的强化作用以及晶粒尺寸效应共同影响,试样的强度先提高后下降,伸长率显著下降,断裂形式由塑性断裂向解理断裂过渡。当氧含量达到0.37%(质量分数)时,伸长率约为7%,试样抗拉强度超过730 MPa,约为商业纯钛的2倍。
High oxygen content titanium(HOC-Ti)was manufactured in-situ via wire arc additive manufacturing(WAAM),and its compositional segregation,microstructure and mechanical properties were studied.The results show that the microstructure of the HOC-Ti component is mainly manifested as acicularαcolonies.As oxygen content increases,the acicularαof the sample is broadened and the colonies become larger.Due to the strengthening of oxygen and the grain size effect,the strength change trend is from high to low,and the elongation is reduced significantly.The fracture mechanism is changed from ductile rupture to cleavage fracture.When the oxygen content is 0.37 wt.%,its elongation is about 7%,and the ultimate tensile strength is more than 730 MPa,which is around double that of commercially pure titanium(CP-Ti).
作者
李昌远
刘长猛
鲁涛
郭跃岭
刘彬
Chang-yuan LI;Chang-meng LIU;Tao LU;Yue-ling GUO;Bin LIU(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Astronautical Systems Engineering,China Academy of Launch Vehicle Technology,Beijing 100076,China)
基金
financially supported by the National Natural Science Foundation of China (Nos. 51875041, 51875042)。
关键词
电弧增材制造
纯钛
高氧含量
显微组织
力学性能
wire arc additive manufacturing
pure titanium
high oxygen content
microstructure
mechanical properties
