首页|Refinement of α'Martensite by Oxygen in Selective Laser Melted Ti-6Al-4V
Refinement of α'Martensite by Oxygen in Selective Laser Melted Ti-6Al-4V
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Oxygen is crucial in influencing the microstructure evolution of selective laser melted(SLMed)Ti-6Al-4V,significantly impacting its applicability in various sectors.Therefore,this study investigates the influnce of oxygen on microstructure evolution,particularly α'martensite transformation and refinement mechanisms.Four alloys,Ti-6Al-4V-xO(x=0.11,0.16,0.21,and 0.25 wt％),were fabricated by the SLM process.The martensite start temperature(Ms)of Ti-6Al-4V,as evaluated by computation,is 656.8 ℃,and oxygen was found to increase the Ms by about 10 ℃ per 0.1 wt％.The SLMed alloy samples exhibit[001]β growth texture along the build direction.Crystallographic analysis of martensite morphology suggests internal twinning on {10(1)1} planes as the lattice invariant strain,which becomes more predominant with increasing oxygen content.Refinement of α'martensite plates by oxygen is due to increased lattice distortion,reduced prior β grain size,and oxygen seg-regation to β grain boundaries.Our findings contribute to improving the understanding of the effect of oxygen on the trans-formation mechanism of α'martensite during SLM of Ti-6Al-4V.
School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China
Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China
School of Materials and Chemistry/Interdisciplinary Centre for Additive Manufacturing,University of Shanghai for Science and Technology,Shanghai 200093,China
Centre for Adaptive System Engineering,ShanghaiTech University,Shanghai 201210,China
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National Natural Science Foundation of ChinaCAS Interdisciplinary Innovation Team ProjectCAS-TWAS President's Fellowship for International PhD Students
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