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Effect of Mn-Addition on the Sliding Wear Resistance and the Cavitation Erosion Resistance of Fe-base Hardfacing Alloy

Mn 첨가가 경면처리용 Fe계 신합금의 캐비테이션 에로젼과 슬라이딩 마모저항성에 미치는 영향

  • Kim, Yoon-Kap (Division of materials Science and Engineering, Hanyang University) ;
  • Oh, Young-Min (Division of materials Science and Engineering, Hanyang University) ;
  • Kim, Seon-Jin (Division of materials Science and Engineering, Hanyang University)
  • 김윤갑 (한양대학교 신소재공학부) ;
  • 오영민 (한양대학교 신소재공학부) ;
  • 김선진 (한양대학교 신소재공학부)
  • Published : 2002.07.01

Abstract

The effect of Mn on cavitation erosion resistance and the sliding wear resistance of Fe-base hardfacing NewAlloy was investigated. Mn is known to decrease stacking fault energy and enhance the formation of $\varepsilon$-martensite. Cavitation erosion resistance for 50 hours and sliding wear resistance for 100 cycles were evaluated by weight loss. Fe-base hardfacing NewAlloy showed more excellent cavitation erosion resistance than Mn-added NewAlloys. $\Upsilon-\alpha$' phase transformation that can enhance erosion resistance by matrix hardening occurred in every specimens. But, only in Mn free Fe-base hardfacing NewAlloy, the hardened matrix could repress the propagation of cracks that was initialed at the matrix-carbides interfaces more effectively than Mn-added NewAlloy The Mn free Fe-base hardfacing NewAlloy showed better sliding wear resistance than Mn-added alloys. Mn-addition up to 5wt.% couldn't increase the sliding wear and cavitation erosion resistance of Fe-base hardfacing alloy because it didn't make $\Upsilon\to\varepsilon$ martensite phase transformation. Therefore, it is considered that the cavitation erosion and the sliding wear resistance can be improved due to $\Upsilon\to\varepsilon$ martensite phase transformation when Mn is added more than 5wt.% in Fe-base hardfacing alloys.

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