The effects of grain size and pore size on the high cycle fatigue behavior of injection molded Ti-6Al-4V compacts

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

1 Citation (Scopus)

Abstract

Although titanium alloy compacts manufactured by metal injection molding (MIM) process have the same static mechanical properties as that of wrought materials with similar composition, their fatigue strength shows remarkably lower levels. In this study, improvement of the fatigue strength of injection molded Ti-6Al-4V alloy compacts was performed by refining the pore and grain sizes through different approaches such as the usage of fine powders, dual phase region sintering, and hydrogenation and dehydrogenation treatment. Especially, the effects of pore size and grain size on the fatigue strength were evaluated. Essentially, the relationship between the fatigue strength and the grain size for HIP treated compacts obeyed the Hall-Petch law. On the other hand, for the injection molded compacts with pores, it was found that the largest pore dominates the fatigue strength in the case of the large pore diameter ratio to the grain diameter, while the relative density influences on the fatigue strength when the pore diameter ratio is small.

Original languageEnglish
Title of host publicationAdvances in Powder Metallurgy and Particulate Materials - 2018
Subtitle of host publicationProceedings of the 2018 International Conference on Powder Metallurgy and Particulate Material, POWDERMET 2018
PublisherMetal Powder Industries Federation
Pages243-252
Number of pages10
ISBN (Electronic)9781943694181
Publication statusPublished - Jan 1 2018
Event2018 International Conference on Powder Metallurgy and Particulate Material, POWDERMET 2018 - San Antonio, United States
Duration: Jun 17 2018Jun 20 2018

Publication series

NameAdvances in Powder Metallurgy and Particulate Materials - 2018: Proceedings of the 2018 International Conference on Powder Metallurgy and Particulate Material, POWDERMET 2018
Volume2018-June

Conference

Conference2018 International Conference on Powder Metallurgy and Particulate Material, POWDERMET 2018
CountryUnited States
CitySan Antonio
Period6/17/186/20/18

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Materials Chemistry
  • Surfaces and Interfaces

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