Wear Resistance Characteristics of Iron Weld Overlays by Composite Chromium Powders

복합 크롬 분말에 의한 철계 용접 오버레이의 내마모 특성

  • 김종철 (동명대학 기계재료학과) ;
  • 박경채 (경북대학교 공과대학 금속공학과) ;
  • 최창옥 (동아대학교 공과대학 금속공학과)
  • Published : 2001.10.01

Abstract

Weld overlay has been developed to improve the property of material surface which is used in the severe environment. Weld overlay is the process which uses an arc heat and welds different composition of alloy on the substrate for the improvements of heat resistance and wear resistance. Weld overlay has a lot of advantages which are high hardness, good processing efficiency, easy controlling of layer thickness, good quality and low cost. In this study, weld overlay was performed by MAG welding on the base metal(SS400) with filler metal which contain composite powders(Cr+C+Mn+Mo+NbC) and solid wire(JIS-YGW11). Characterization of hardness and wear resistance were analyzed by EDS, EPMA, XRD and observations of microstructure were performed to investigate characteristics of overlays. The experimental results of overlaid specimens manufactured with Cr+C+Mn+Mo+NbC powders were obtained as fellows. ${\alpha}-phase$, M(Fe, Cr)3C and NbC of overlays were increased with decreasing the wire feed rates and increasing powder feed rates. Also the hardness of overlays were increased and the specific wear were decreased.

Keywords

References

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