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Additive Manufactured Ti-6Al-4V Alloy with Graded Micro-structure by Selective Laser Melting
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Affiliation:

1.Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;2.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;3.Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha 410083, China

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Fund Project:

National Key R&D Program of China (2018YFB0704100); Key-Area Research and Development Program of Guangdong Province (2019B010943001); Natural Science Foundation of Hunan Province (2018JJ3654); Fund of State Key Laboratory of Powder Metallurgy, Central South University; International Exchange Program of China Postdoctoral Science Foundation

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    Abstract:

    Graded Ti-6Al-4V alloys were produced by selective laser melting (SLM). Regulation of laser power and scanning speed was applied separately on each sample along the building direction. The microstructure transformation and phase transition in the graded Ti-6Al-4V were investigated. Results show that due to the rapid cooling rate of the SLM process, the microstructure of Ti-6Al-4V is mainly acicular α′ martensite in prior β column grains. The β column grains are enlarged with the increase of laser power or the decrease of scanning speed. The preferential orientation of α′ grains changes due to the variation of laser power and scanning speed. Moreover, the ascending scanning speed or descending scanning speed during the process may lead to two different defects.

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[Liu Shichao, Lei Pengfei, Liu Min, Zhang Gengming, Chen Chao, Zhou Kechao. Additive Manufactured Ti-6Al-4V Alloy with Graded Micro-structure by Selective Laser Melting[J]. Rare Metal Materials and Engineering,2021,50(10):3543~3549.]
DOI:10.12442/j. issn.1002-185X.20200587

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History
  • Received:August 11,2020
  • Revised:October 17,2020
  • Adopted:December 14,2020
  • Online: October 28,2021
  • Published: October 25,2021