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对不同寿命的W6Mo5Cr4V2钢冷辗芯辊疲劳裂纹源区域的表层和次表层碳化物形态进行了比较和分析。研究了疲劳裂纹源的形成机理。结果表明,表层和次表层碳化物的形貌、分布和大小等因素直接影响着疲劳裂纹的萌生。在表层碳化物缺陷处萌生疲劳裂纹一般有两种方式:表层碳化物直接开裂和在碳化物脱落后的凹坑处形成微裂纹;在次表层碳化物处萌生疲劳裂纹则主要是由于其周围孔洞中的应力集中造成的。
The morphology of the surface and subsurface carbide in the fatigue crack source region of W6Mo5Cr4V2 steel with different life span was compared and analyzed. The formation mechanism of fatigue crack source was studied. The results show that the topography and subsurface carbide morphology, distribution and size and other factors directly affect the initiation of fatigue cracks. In the surface carbide defects at the initiation of fatigue cracks in general there are two ways: the surface carbide directly cracking and carbide in the pit after the formation of micro-cracks; in the sub-surface carbides fatigue crack initiation is mainly due to its surrounding holes In the stress concentration caused.