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Aging Treatment Optimization of Ti-3Al-8V-6Cr-4Mo-4Zr Alloy for Spring Application

스프링용 Ti-3Al-8V-6Cr-4Mo-4Zr 타이타늄 합금의 시효열처리 최적화

  • Received : 2017.11.06
  • Accepted : 2017.11.23
  • Published : 2017.11.30

Abstract

Mechanical properties of titanium alloy can be improved by controlling microstructure through heat treatment. In this study, Ti-3Al-8V-6Cr-4Mo-4Zr metastable beta titanium alloy, was controlled for excellent mechanical property and sound formability through various high temperature heat treatment and aging conditions and the optimum heat treatment conditions were determined. The specimens were heat-treated at $950^{\circ}C$, followed by various aging treatments from $430^{\circ}C$ to $500^{\circ}C$ for 1 to 24 h. As aging temperature and holding time increased, hardness increased by ${\beta}^{\prime}$ phase formation and precipitation of secondary ${\alpha}$ phase in ${\beta}$ matrix. However, the optimum aging temperature and holding time for mechanical properties were at $450{\sim}470^{\circ}C$ for 8~16 hr. Hardness values of the specimen aged at $450^{\circ}C$ for 8 h were found to be the highest. These results can be effectively applied to fabrication of spring with better formability and mechanical property.

Keywords

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Cited by

  1. 순수 타이타늄의 기계적 특성에 미치는 마찰 교반 용접 공정 조건의 영향 vol.32, pp.3, 2017, https://doi.org/10.12656/jksht.2019.32.3.124