Fe-Cr-C-Ni/Mn 합금에서 변형유기상변태가 solid particle erosion 거동에 미치는 영향

Abstract

Fe-12Cr-0.4C-xNi/Mn (x=5, 10wt.%) 오스테나이트 합금에서 변형유기상변태가 solid particle erosion (SPE) 저항성에 미치는 영향에 대하여 고찰하였다. 변형유기상변태의 용이성을 측정하기 위한 방법으로 오스테나이트 안정화원소인 Ni과 Mn을 첨가하여 인장실험을 실시하였으며, SPE 실험을 통해 변형유기상변태와 SPE 거동과의 연관성을 관찰하였다. 인장실험결과 Ni과 Mn의 첨가량이 증가할수록 변형유기상변태가 일어나는데 필요한 에너지, 즉 critical strain energy (CSE)가 증가하였다. SPE 실험결과 입사각도에 관계없이 입사속도가 낮아짐에 따라 작은 CSE를 가진 합금의 SPE 저항성은 점진적으로 향상되었으며, 이는 낮은 입사속도에서 작은 CSE를 가진 합금이 고체입자의 충격에 의한 impact energy를 더욱 잘 흡수함으로써 ἀ 마르텐사이트 volume fraction이 상대적으로 증가했기 때문인 것으로 사료된다. | The effects of nickel and manganese concentrations and also the impact velocity on the solid particle erosion behavior of Fe-12Cr-0.4C-xNi/Mn (x = 5 and 10 wt.%) alloys were investigated with respect to strain-induced martensitic transformation. The critical strain energy (CSE), which is defined as the energy required to initiate the martensitic transformation increased with increasing nickel and manganese concentrations. As the impact velocity decreased, the solid particle erosion resistance of the low CSE alloy improved compared to a high CSE alloy under the given ranges of impingement angles and impact velocities. This result was most likely due to an increase in the volume fraction of martensite that formed during the solid particle erosion test in the low CSE alloy when the impact velocity was decreased.; The effects of nickel and manganese concentrations and also the impact velocity on the solid particle erosion behavior of Fe-12Cr-0.4C-xNi/Mn (x = 5 and 10 wt.%) alloys were investigated with respect to strain-induced martensitic transformation. The critical strain energy (CSE), which is defined as the energy required to initiate the martensitic transformation increased with increasing nickel and manganese concentrations. As the impact velocity decreased, the solid particle erosion resistance of the low CSE alloy improved compared to a high CSE alloy under the given ranges of impingement angles and impact velocities. This result was most likely due to an increase in the volume fraction of martensite that formed during the solid particle erosion test in the low CSE alloy when the impact velocity was decreased.