Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Improvement of the Resistance to Cavitation Erosion by the Formation of $\beta$' Martensite in Flame-Quenched Cu-9Al-4.5Ni-4.5Fe Alloys

화염급냉 표면처리된 Cu-9Al-4.5Ni-4.5Fe 합금의 $\beta$' 마르텐사이트 형성에 의한 케비테이션 침식 저항성 향상에 관한 연구

  • 홍성모 (충남대학교 금속공학과) ;
  • 이민구 (한국원자력연구소 원자력재료기술개발부) ;
  • 김광호 (충남대학교 재료공학과) ;
  • 김경호 (한국원자력연구소 원자력재료기술개발부) ;
  • 김흥회 (한국원자력연구소 원자력재료기술개발부) ;
  • 홍순익 (충남대학교 금속공학과)
  • Published : 2004.08.01
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Abstract

Cavitation erosion properties of the Cu-9Al-4.5Ni-4.5Fe alloys (Al-bronze) surface-modified by flame quenching process have been investigated. After flame quenching at above $T_{\beta}$, the surfaces of Al-bronze with $\alpha$ + $\textsc{k}$ structure have been changed into the $\alpha$ + $\beta$' martensite phases by the eutectoid reaction of $\alpha$ + $\textsc{k}$\longrightarrow$\beta$ followed by the martensite transformation of $\beta$\longrightarrow$\beta$'. As a result of cavitation test, the measured incubation time and erosion rate of the $\alpha$ + $\beta$' alloy was 1.2 times higher and 1.5 times lower, respectively, compared to those of the conventional $\alpha$ + $\textsc{k}$ alloys, showing a remarkable increase of cavitation resistance with the formation of $\beta$' martensite. This is attributed to a preferential erosion of the $\textsc{k}$ precipitates that show the lowest resistance among the $\alpha$, $\textsc{k}$, $\beta$' phases under cavitation loading.ases under cavitation loading.

Keywords

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