Effect of grain size on the fatigue properties of injection moulded Ti-6Al-4V compacts

Kentaro Kudo, Hiroyoshi Ishimitsu, Jungho Choe, Toshiko Osada, Hideshi Miura, Kazunari Shinagawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Metal injection molding (MIM) process offers net shape production and high cost efficiency in order to produce the materials with poor workability such as Ti-6Al-4V. In our previous studies, injection molded Ti-6Al-4V showed high tensile strength and elongation comparable to those of wrought materials. However, fatigue strength of injection molded Ti-6Al-4V was lower than that of wrought materials because of large grain size and retained pores. In this study, the grain size of MIM Ti-6Al-4V compacts was decreased by addition of TiB2 powder and using the fine powder. As a result, the 0.4 mass% Boron added compacts treated HIP showed the fine grain size. Therefore, 93 % of fatigue strength compared to that of wrought material was obtained. In addition, the relationship of grain size and fatigue strength showed good agreement with Hall-Petch relations.

Original languageEnglish
Title of host publicationWorld PM 2016 Congress and Exhibition
PublisherEuropean Powder Metallurgy Association (EPMA)
ISBN (Electronic)9781899072484
Publication statusPublished - Jan 1 2016
EventWorld Powder Metallurgy 2016 Congress and Exhibition, World PM 2016 - Hamburg, Germany
Duration: Oct 9 2016Oct 13 2016

Publication series

NameWorld PM 2016 Congress and Exhibition

Other

OtherWorld Powder Metallurgy 2016 Congress and Exhibition, World PM 2016
CountryGermany
CityHamburg
Period10/9/1610/13/16

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Metals and Alloys

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    Kudo, K., Ishimitsu, H., Choe, J., Osada, T., Miura, H., & Shinagawa, K. (2016). Effect of grain size on the fatigue properties of injection moulded Ti-6Al-4V compacts. In World PM 2016 Congress and Exhibition (World PM 2016 Congress and Exhibition). European Powder Metallurgy Association (EPMA).