期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 26, 期 6, 页码 2572-2582出版社
SPRINGER
DOI: 10.1007/s11665-017-2710-y
关键词
corrosion behavior; direct metal laser sintering; microstructure; tensile test; Ti-6Al-4V
An experimental investigation on the effects of post-annealing treatments on the microstructure, mechanical properties and corrosion behavior of direct metal laser sintered Ti-6Al-4V alloys has been conducted. The microstructure and phase evolution as affected by annealing treatment temperature were examined through scanning electron microscopy and x-ray diffraction. The tensile properties and Vickers hardness were measured and compared to the commercial Grade 5 Ti-6Al-4V alloy. Corrosion behavior of the parts was analyzed electrochemically in simulated body fluid at 37 degrees C. It was found out that the as-printed parts mainly composed of non-equilibrium alpha' phase. Annealing treatment allowed the transformation from alpha' to alpha phase and the development of beta phase. The tensile test results indicated that post-annealing treatment could improve the ductility and decrease the strength. The as-printed Ti-6Al-4V part exhibits inferior corrosion resistance compared to the commercial alloy, and post-annealing treatment can reduce its susceptibility to corrosion by reducing the two-phase interface area.
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