| 초록 |
The effect of the strain-induced martensitic transformation on the cavitation erosion resistance of Fe-10Cr-0.3C-xMn (x = 5, 10, 12 and 15 wt.%) alloys was investigated for 50 hours using 20 kHz vibratory cavitation erosion test equipment. Low-Mn alloys (＜ 5 wt.% Mn) and high alloys ( ＞ 10 wt.% Mn) exhibited the γ→α` and γ→ε strain-induced martensitic transformation, respectively. Mn-addition above 10 wt.% was observed to increase the cavitation erosion resistance of the Fe-based alloy. It was concluded that the γ→ε strain-induced martensitic transformation would be more beneficial than the γ→α` strain-induced martensitic transformation due to the blocking of the dislocation motion, thus increasing the hardness of the matrix by effective work-hardening. Therefore, in this study, the effect of Mn on the strain-induced martensitic transformation was investigated by measuring the critical strain energy required to initiate γ→α` and γ→ε strain-induced martensitic transformation. The relationship between the critical strain energy and the cavitation erosion resistance was also investigated with Fe-10Cr-0.3C-xMn (x = 5, 10, 12 and 15 wt.%) alloys. |
