Fe-Cr-C-Ni 합금에서 변형유기상변태가 Solid Particle Erosion 저항성에 미치는 영향

Abstract

Fe-10Cr-0.5C-xNi(x=3, 5 and 10 wt.%)의 오스테나이트 합금의 변형유기상변태가 Solid particle erosion 저항성에 미치는 영향에 대하여 고찰하였다. 인장시험을 통하여 Nickel 첨가량에 따른 변형유기상변태 용이성을 측정하였으며 Solid particle erosion 시험을 실시하여 변형유기상변태와 Solid particle erosion 거동 간의 연관성을 관찰하였다. 인장시험 결과 Nickel 첨가량이 증가할수록 변형유기상변태가 일어나는데 필요한 에너지는 증가하였다. Solid particle erosion 시험 결과 Solid particle erosion 저항성은 입사각도에 의해 크게 영향을 받는 것이 관찰되었으며 Ni 첨가량에 따른 변형유기상변태 용이성이 Solid particle erosion 저항성에 미치는 영향은 입사각도에 따라 다른 양상을 보였다. 이는 충돌입자의 입사각도에 따른 Solid particle erosion 거동의 변화가 원인으로 입사각도가 30°, 90° 인 경우 모두에서 cutting 거동과 deformation 거동이 복합적으로 일어나 변형유기상변태를 유발한 반면 입사각도가 45°인 경우 다른 각도에 비하여 cutting 거동이 강하게 유발됨으로 인하여 변형유기상변태가 거의 일어나지 않아 Ni 첨가량에 따른 변형유기상변태 용이성이 Solid particle erosion 저항성에 별다른 영향을 주지 못하였다.; In the present study, the effect of strain induced martensitic transformation on solid particle erosion(SPE) resistance of Fe-10Cr-0.5C-xNi (3, 5 and 10wt%) alloy was investigated. To obtain the relationship between the ability of strain induced martensitic transformation and SPE resistance, The critical strain energy for the strain induced martensitic transformation with Ni content in Fe-10Cr-0.5C-xNi (3, 5 and 10wt%) alloy was measured through the tensile tests. The strain energy to initiate the martensite phase transformation was increased by the addition of nickel. SPE resistance was strongly influenced by the angle of incidence of solid particles. And the relation between SPE resistance and the ability of strain induced martensitic transformation with Ni content has different aspect by the angle of incidence. It was considered to be due to that the SPE mechanism transition by the angle of incidence. When the angle of incidence was 30, 90°, mixed mechanisms of cutting and deformation caused the strain induced martensitic transformation whereas there was no transformation due to the overwhelming cutting mechanism when the angle of incidence was 45°. So, when the angle of incidence was 45°, there was no effect of the tendency of strain induced martensitic transformation on the SPE resistance.