Fe-Cr-C-Si합금에서 solid particle erosion 저항성에 미치는 Ti, V, Nb, B의 영향

Abstract

Fe-20Cr-2.4C-1Si 합금에 탄화물형성 원소로 알려진 Ti, V, Nb 을 각각 1,3 wt% 첨가하여 합금에 형성되는 탄화물의 종류, 분율이 solid particle erosion 저항성에 미치는 영향에 대해 알아보았으며, 결정립 미세화 및 변형유기상변태를 촉진시키는 원소로 알려진 B을 0.3, 0.6wt% 첨가하여 solid particle erosion 저항성에 미치는 변형유기상변태의 영향에 대해 알아보았다.

Ti, V, Nb 첨가에 따른 탄화물의 종류 및 분율에 따른 solid particle erosion 거동을 관찰하기 위해 SPE 실험 전후의 표면분석을 실시하였다. solid particle erosion실험결과 Ti, V, Nb 첨가에 의해 형성된 MC-TYPE 탄화물이 particle 입자의 impact에 의해 떨어져 나가 solid particle erosion 저항성에 좋지 않은 영향을 미치는 것으로 나타났다.

Fe-20Cr-2.4C-1Si 합금에 B의 첨가량이 증가될수록 미세구조가 fine 해지며 마식 저항성도 함께 증가한다. 변형유기 마르텐사이트 상변태 경향 분석을 위한 X선 회절 분석 결과, B 첨가 합금에서 높은 상변태 경향성을 가짐이 확인된다. 이러한 효과는 B 첨가에 따라 미세화 및 분산된 탄화물이 partial dislocation의 이동을 효과적으로 차단하여 dislocation interaction을 증가시키기 때문인 것으로 판단된다. |In the present study, the effects of Ti, V, Nb and B on the solid particle erosion behavior of Fe-20Cr-2.4C-1Si-xTi, V, Nb (x = 1 and 3 wt.%) alloys and Fe-20Cr-2.4C-1Si-xB (x= 0.3 and 0.6 wt%) alloys were investigated with respect to carbide and strain-induced martensitic transformation. It was found that the solid particle erosion resistance of alloys decreased with addition of Ti, V, Nb. The decrease of resistance was considered to be due to the formation of MC-Type carbide falling apart from matrix by impact. Solid particle erosion resistance of alloys increased with addition of B. Solid particle erosion resistance was strongly influenced by grain size refinement and strain induced martensitic transformation by addition of B.; In the present study, the effects of Ti, V, Nb and B on the solid particle erosion behavior of Fe-20Cr-2.4C-1Si-xTi, V, Nb (x = 1 and 3 wt.%) alloys and Fe-20Cr-2.4C-1Si-xB (x= 0.3 and 0.6 wt%) alloys were investigated with respect to carbide and strain-induced martensitic transformation. It was found that the solid particle erosion resistance of alloys decreased with addition of Ti, V, Nb. The decrease of resistance was considered to be due to the formation of MC-Type carbide falling apart from matrix by impact. Solid particle erosion resistance of alloys increased with addition of B. Solid particle erosion resistance was strongly influenced by grain size refinement and strain induced martensitic transformation by addition of B.