合金
融合
材料科学
氢
冶金
过程(计算)
钛合金
激光器
化学
光学
计算机科学
语言学
操作系统
物理
哲学
有机化学
作者
Wangping Wu,Guang He,Jiaqi Huang,Ao Zhang,Liang Gao,Zhengbiao Ouyang,Zilong Sun,Li Guan,Song-Zhu Chu,Peng Li,Peng Jiang,Yi Zhang
标识
DOI:10.1016/j.msea.2022.144339
摘要
Ti–6Al–4V alloy parts were obtained by laser powder bed fusion (L-PBF) process. The influence of electrochemically charged hydrogen on the microstructure, phase identification, and mechanical properties of as-charged Ti–6Al–4V alloy parts from printing and deposition directions was studied. The impact of hydrogen desorption on L-PBF Ti–6Al–4V alloy parts was characterized with oxygen nitrogen hydrogen analyzer, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that as-built Ti–6Al–4V alloy was composed of a unique structure of a kind of equiaxed α (hcp) + intergranular β (bcc) dual-phase. The average surface roughness values for R a and R q were 10.1 ± 1.0 μm and 12.6 ± 1.3 μm, respectively. After electrochemically charged hydrogen, the phase in the part was composed of a solid solution of hydrogen in α-phase, and δ-TiH 2 and δ-TiH x hydride phases. The mechanical properties of as-printed Ti–6Al–4V alloy part from deposition direction were higher than those of as-built part from printing direction. After electrochemically charged hydrogen, the hydrogen content in the as-built Ti–6Al–4V alloy part increased significantly. The mechanical properties of the as-charged parts from printing and deposition directions were decreased significantly. The susceptibility to hydrogen embrittlement significantly depended on the orientation of additively manufactured Ti–6Al–4V alloy parts, the as-printed part from deposition direction had a higher resistance to hydrogen embrittlement compared with printing direction. After electrochemically charged hydrogen, Ti–6Al–4V alloy parts from printing direction was prone to brittle fracture and form the microcracks in α phase or along α/β interface in the as-built part.
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