Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effects of Heat Treatment and Ti addition on Microstructures in Modified Invar Alloys

개량형 인바합금의 미세조직에 미치는 열처리 및 Ti 첨가 영향

  • Huh, Min-Sun (Department of Metallurgy & Materials Science, Changwon National University) ;
  • Lee, Jung-Han (Department of Metallurgy & Materials Science, Changwon National University) ;
  • Lee, Chan-Gyu (Department of Metallurgy & Materials Science, Changwon National University) ;
  • Lee, Jae-Hyun (Department of Metallurgy & Materials Science, Changwon National University)
  • 허민선 (창원대학교 금속재료공학과) ;
  • 이정한 (창원대학교 금속재료공학과) ;
  • 이찬규 (창원대학교 금속재료공학과) ;
  • 이재현 (창원대학교 금속재료공학과)
  • Received : 2000.11.08
  • Published : 2000.11.30
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Abstract

There has been a considerable attention on Invar alloys due to its low thermal expansion property. A low thermal expansion property of Invar alloys, lower than $10^{-6}$ near the room temperature, is attractive for electric transmission lines and precision machine tools. However, the expansion property of Invar alloys is limited below about 520K, and mechanical properties are relatively low to apply to electric transmission line. In order to improve mechanical properties in this alloy, Ti alloying element was added to the $Ni_{38}-Mo_2-Cr_1-Fe$ invar alloy. The microstructure Ti added alloy showed finer than that of the unalloyed one. It was found that the (Mo, Ti), Mo carbide formed by Ti addition obstacled grain growth by pinning effect and supplyed recrystallization sites during heat-treatment. Optimum heat-treatment conditions with Ti addition were also discussed in the modified Invar alloy.

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