Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Alloy Design and Properties of Ni based Superalloy LESS 1: I. Alloy Design and Phase Stability at High Temperature

Ni기 초내열 합금 LESS 1의 합금설계 및 평가: I. 합금 설계 및 고온 상 안정성 평가

  • Youn, Jeong Il (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Kang, Byung Il (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Choi, Bong Jae (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Kim, Young Jig (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
  • 윤정일 (성균관대학교 신소재공학과) ;
  • 강병일 (성균관대학교 신소재공학과) ;
  • 최봉재 (성균관대학교 신소재공학과) ;
  • 김영직 (성균관대학교 신소재공학과)
  • Received : 2013.09.05
  • Accepted : 2013.10.22
  • Published : 2013.10.31
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Abstract

The alloys required for fossil power plants are altered from stainless steel that has been used below $600^{\circ}C$ to Ni-based alloys that can operate at $700^{\circ}C$ for Hyper Super Critical (HSC) steam turbine. The IN740 alloy (Special Metals Co. USA) is proposed for improved rupture strength and corrosion resistance at high temperature. However, previous studies with experiments and simulations on stable phases at about $700^{\circ}C$ indicated the formation of the eta phase with the wasting of a gamma prime phase, which is the most important reinforced phase in precipitation hardened Ni alloys, and this resulted in the formation of precipitation free zones to decrease the strength. On the basis of thermodynamic calculation, the new Ni-based superalloy named LESS 1 (Low Eta Sigma Superalloy) was designed in this study to improve the strengthening effect and structure stability by depressing the formation of topologically close packed phases, especially sigma and eta phases at high temperature. A thermal exposure test was carried out to determine the microstructure stability of LESS 1 in comparison with IN740 at $800^{\circ}C$ for 300 hrs. The experimental results show that a needle-shaped eta phase was formed in the grin boundary and it grew to intragrain, and a precipitation free zone was also observed in IN740, but these defects were entirely controlled in LESS 1.

Keywords

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