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The microstructural changes of Fe-20Mn-12Cr-1Cu alloy have been studied during high temperature gas nitriding (HTGN) at the range of 1000oC~1150oC in an atmosphere of nitrogen gas. The mixed microstructure of austenite and ε-martensite of as-received alloy was changed to austenite single phase after HTGN treatment at the nitrogen-permeated surface layer, however the interior region that was not affected nitrogen permeation remained the structure of austenite and ε-martensite. With raising the HTGN treatment temperature, the concentration and permeation depth of nitrogen, which is known as the austenite stabilizing element, were increased. Accordingly, the depth of austenite single phase region was increased. The outmost surface of HTGN treated alloy at 1000oC appeared Cr nitride. And this was in good agreement with the thermodynamically calculated phase diagram. The grain growth was delayed after HTGN treatment temperature ranges of 1000oC~ 1100oC due to the grain boundary precipitates. For the HTGN treatment temperature of 1150oC, the fine grain region was shown at the near surface due to the grain boundary precipitates, however, owing to the depletion of grain boundary precipitates, coarse grain was appeared at the depth far from the surface. This depletion may come from the strong affinity between nitrogen and substitutional element of Al and Ti leading the diffusion of these elements from interior to surface. Because of the nitrogen dissolution at the nitrogen-permeated surface layer by HTGN treatment, the surface hardness was increased above 150 Hv compared to the interior region that was consisted with the mixed microstructure of austenite and ε-martensite.

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기사명 저자명 페이지 원문 목차
Fe-20Mn-12Cr-1Cu 제진합금의 고온가스 질화처리 성지현, 김영희, 성장현, 강창룡 pp.105-112

CaO 첨가에 의한 AZ31 합금 미세조직의 열적 안정성 변화 전중환 pp.113-119

Mod. 440A 마르텐사이트 스테인리스강의 기계적 성질에 미치는 템퍼링의 영향 권순두, 김영철, 강창룡 pp.120-125

과공석강의 구상화처리에 미치는 Si 첨가의 영향 도영수, 손지하, 박노진, 박용일, 최환, 오명훈 pp.126-131

마그네슘의 안전대책 임석원 pp.132-138
금형 열처리 및 확산계 표면처리. 12, BPN 처리 김성완 pp.139-147

참고문헌 (21건) : 자료제공( 네이버학술정보 )

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