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Effect of heat treatment on the microstructure and hardness of a novel Ti-6Al-6Mo alloy formed by laser solid forming
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Affiliation:

1.School of Material Science and Engineering,Chang’an University,Xi’an;2.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an

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Fund Project:

The National Key Research and Development Program of China (No. 2016YFB0700301, No. 2016YFB1100103), China Postdoctoral Science Foundation (No. 2016M592731)

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    Abstract:

    A novel Ti-6Al-6Mo alloy sample was fabricated by laser solid forming (LSF) using blended elemental powders as raw material. The microstructure of as-deposited sample and the effects of solution and aging treatment on the microstructure and microhardness of LSF Ti-6Al-6Mo alloy were discussed. The results showed that the heat treatment conducted in this study has no significant effect on the morphologies of prior b grains of the alloy. The solution temperature, solution time, and the cooling method after solution treatment have a significant effect on the morphology and size of the α phase in the prior β grains and the microhardness of the LSF Ti-6Al-6Mo alloy. When the aging time exceeds 4 hours, the microstructure and microhardness of the alloy change little with increasing aging time. Based on the analysis of precipitation and strengthening effect of the primary α laths and secondary α laths on the b matrix in LSF Ti-6Al-6Mo alloy under different heat treatment conditions, the influence mechanism of heat treatment on the microstructure and microhardness of LSF Ti-6Al-6Mo was revealed.

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[Zhang Fengying, Hu Tengteng, Tan Hua, Qiu Ying, Mei Min, Yang Haiou. Effect of heat treatment on the microstructure and hardness of a novel Ti-6Al-6Mo alloy formed by laser solid forming[J]. Rare Metal Materials and Engineering,2019,48(2):357~365.]
DOI:10.12442/j. issn.1002-185X.20180526

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History
  • Received:May 22,2018
  • Revised:June 21,2018
  • Adopted:June 27,2018
  • Online: March 15,2019
  • Published: