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用金相显微镜和扫描电镜对4Cr5MoV1Si钢热疲劳过程进行了微观分析.结果表明,热疲劳裂纹在最大应变区形核,以主裂纹与其前端孔洞联接方式扩展.
The microstructure and thermal fatigue of 4Cr5MoV1Si steel were investigated by means of optical microscopy and scanning electron microscopy. The results show that the thermal fatigue cracks nucleate in the region of maximum strain and extend with the connection of the main crack and the front hole.