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MA법으로 제조된 Ni기 합금에서 Y2O3 첨가에 따른 인장강도변화와 시효처리 효과 KCI 등재

Variation of Tensile Strength by Addition of Y2O3 and Effect of Aging Treatment in Ni Base Alloy Fabricated by MA Method

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한국분말야금학회지 (Journal of Korean Powder Metallurgy Institute)
한국분말재료학회(구 한국분말야금학회) (Korean Powder Metallurgy Institute)
초록

Ni-20Cr-20Fe-5Nb alloy with or without was manufactured by mechanical alloying process and consolidated by spark plasma sintering (SPS). The grain size of the alloy with was smaller than that of alloy without which results from the effect of suppressing grain growth. The tensile strength at room temperature was increased by the addition of but decreased abruptly at temperature above . It seems to result from the change of deformation mechanism due to fine grain size, that is, grain boundary sliding is predominant at above while internal dislocation movement is predominant at below . After conventional heat treatment process of solution treatment and aging, a small amount of phase was formed in Ni-20Cr-20Fe-5Nb alloy while a large amount of was formed in Inconel 718 in the previous report. This is due to exhaustion of Nb content by the formation of NbC during consolidation.

저자
  • 김일호 | Kim Il-Ho
  • 이원식 | Lee Won-Sik
  • 고세현 | Ko Se-Hyun
  • 장진만 | Jang Jin-Man
  • 권숙인 | Kwun Sook-In