| Autor: |
Nurly, Hasfi F., Zhang, Jinhu, Ren, Dechun, Cai, Yusheng, Ji, Haibin, Xu, Dongsheng, Dong, Zhicheng, Wang, Hao, Hu, Qingmiao, Lei, Jiafeng, Yang, Rui |
| Zdroj: |
Acta Metallurgica Sinica (English Letters); May 2024, Vol. 37 Issue: 5 p777-792, 16p |
| Abstrakt: |
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 °C, and oxygen was found to increase the Msby about 10 °C per 0.1 wt%. The SLMed alloy samples exhibit [001]βgrowth texture along the build direction. Crystallographic analysis of martensite morphology suggests internal twinning on 101¯1planes 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 βgrain size, and oxygen segregation to βgrain boundaries. Our findings contribute to improving the understanding of the effect of oxygen on the transformation mechanism of α′ martensite during SLM of Ti–6Al–4V. |
| Databáze: |
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