Precipitation of α'-Phase in Fe-Cr-Al Alloy during Thermal Cycling Process
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摘要: 通過1200℃緩冷至室溫熱循環過程,由于鉻組元非平衡偏聚,加快鉻在Fe25Cr5Al合金中向晶界擴散,并產生富鉻的α'相沿晶及晶內沉淀;相變導致合金脆化,在晶界可觀察到微米級α'相,并產生穿晶解理斷裂失效破壞。Abstract: By thermal cycling treatment from 1200℃ to room temperature, a considerable acceleration of Cr diffusion to grain boundaries in Fe25Cr5Al alloy occurred due to nonequilibrium Cr element segregation, and resulted in the precipitation of Cr-rich α'-phase at grain boundaries and within grains; micrometer scale of α'-phase was observed at the grain boundary, the phase transformation resulted in the failure of the alloy by a mode of transgranular deavage fracture.
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