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Micrstructure and Formation Mechanism of Alpha-case in Cast Titanium Alloy
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Dalian University of Technology

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TG 146. 2 3

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    Abstract:

    The ingot of Ti-6Al-4V alloy was prepared by investment casting. Microstructure and formation mechanism of alpha-case in the surface layer of the ingot were investigated by optical microscope (OM), electron probe micro-analyzer (EPMA) and Vickers hardness. The results show that the alpha-case covers the whole surface of the sample, and the microstructure of the alpha-case features in a coarse plate-shaped structure which ranked as-basketweave. The formation mechanism of alpha-case is associated with the diffusion of interstitial oxygen and carbon atoms in the shell material toward matrix alloy. Depth of alpha-case obtained from micro-hardness testing is slightly deeper than that observed by OM. More reliable results come from the micro-hardness testing for removing the alpha-case completely.

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[Fang Canfeng. Micrstructure and Formation Mechanism of Alpha-case in Cast Titanium Alloy[J]. Rare Metal Materials and Engineering,2016,45(7):1736~1739.]
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History
  • Received:June 25,2014
  • Revised:July 23,2014
  • Adopted:August 12,2014
  • Online: October 09,2016
  • Published: