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通过对四组不同非马氏体层深度的20CrMnTi 钢渗碳滚轮试样所进行的组织形态、应力分析和接触疲劳试验发现,渗碳层表面非马氏体组织是极细珠光体、针状珠光体和上贝氏体。这类非马氏体层愈深,表面张应力愈大,次表层最大压应力愈小。与组织和应力对应,接触疲劳寿命随非马氏体层深的增加而降低。而非马氏体沿层深分布的不均匀性弱化了表面组织性能,是导致疲劳寿命下降的主要原因。
The morphology, stress analysis and contact fatigue test of four groups of 20CrMnTi steel carburized roller specimens with different non-martensite depths showed that the surface of carburized layer was non-martensite with very fine pearlite, acicular Pearlite and bainite. The deeper this type of non-martensite, the greater the surface tension, the smaller the maximum subsurface compressive stress. Corresponding to the organization and stress, the contact fatigue life decreases with the increase of non-martensite layer depth. The non-uniformity of non-martensite distribution along the layer weakens the surface microstructure, which is the main reason for the decrease of fatigue life.