Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


공학

한국표면공학회지 (33권1호 10-16)

Effect of Mn-Addition on the Cavitation Erosion Resistance of Surface-hardened Fe-20Cr-1Si-1C Aolly

Fe-20Cr-1Si-1C계 경면처리 합금의 cavitation erosion 저항성에 미치는 Mn 첨가의 영향

김수철;박인호;장세기;김선진;강성군;
;;;;;

한양대학교 공과대학 재료공학과;POSCO 기술연구소;
한양대학교 공과대학 재료공학과;POSCO 기술연구소;

Abstract

Characteristics of cavitation erosion resistance of Fe-20Cr-1Si-1C-xMn(x=0, 5, 15) alloys were investigated by SEM and XRD analysis. The effects on strain-induced transformations were considerably reduced with increasing the amounts of Mn due to twining that occurred at 5, 15Mn alloys, activating cavitation erosion rates(mg/$ extrm{cm}^2$) which varied as 0.055, 0.114 and 0.160mg/$ extrm{cm}^2$ for 0, 5, 15Mn. From the results, it was found that the addition of Mn element in Fe-base alloy provides more cracking sites at twins rather than absorbing strain energies, so accelerates cavitation erosion rates.

Keywords