Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Cooling Rates on Mechanical Properties and Microstructure of Inconel Alloys

인코넬 합금의 미세조직과 기계적 특성에 미치는 냉각속도 영향

  • Park, No-Kyeong (School of Materials Science and Engineering, Kyungpook National University) ;
  • Lee, Ho-Seong (School of Materials Science and Engineering, Kyungpook National University) ;
  • Chai, Young-Suck (School of Mechanical Engineering, Yeungnam University)
  • 박노경 (경북대학교 신소재공학부) ;
  • 이호성 (경북대학교 신소재공학부) ;
  • 채영석 (영남대학교 기계공학부)
  • Published : 2007.10.27
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Abstract

The mechanical properties and microstructure of Inconel 690 and 600 alloys with various cooling rates were investigated. Optical microscopy and scanning electron microscopy observations indicated that in case of the cooling rate of $0.5^{\circ}C/min$, discontinuous carbides along the grain boundaries were formed and when the cooling rate was $10^{\circ}C/min$, continuous carbides were formed in Inconel 690 and 600 alloys. For the annealed Inconel 690 alloy with high Cr content, a lot of annealing twins, which led the preferential growth of (111) planes, were observed. However, the annealed Inconel 600 alloy with low Cr content showed a few annealing twins and the preferential growth of (200) planes. Inconel 600 alloy had a larger value of ultimate tensile strength (UTS) than Inconel 690 alloy.

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