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本文以20CrMnMo 钢为对象比较全面地研究了不同渗碳层厚度、渗碳层碳含量以及不同心部组织对扭转流变硬化行为和断裂特征的影响。结果表明,渗碳件的屈服强度和流变硬化行为主要取决于心部组织。在心部组织相同的条件下,渗碳层的成分、组织和渗层厚度主要影响渗碳件的断裂应变,从而影响其断裂韧度。此外,在材质相同、强度水平相近的条件下,渗碳件的接触疲劳寿命随渗层厚度增加而增大的现象,从力学性能角度看是由于断裂应变随渗层厚度增加而增大,使断裂韧度增大所致,其原因与残余压力大小分布随渗层厚度变化有关。
In this paper, the effects of different carburized layer thickness, carbon content of carburized layer and different core tissues on the torsional rheological hardening behavior and fracture characteristics of 20CrMnMo steel were comprehensively studied. The results show that the yield strength and rheological hardening behavior of carburized parts depend mainly on the heart tissue. Under the same conditions of the heart tissue, the composition, microstructure and the thickness of the carburized layer mainly affect the fracture strain of the carburized part, thus affecting the fracture toughness. In addition, under the condition of the same material and similar strength, the contact fatigue life of the carburized parts increases with the increase of the thickness of the carburized layer, which is due to the increase of fracture strain with the increase of the thickness of the carburized layer from the mechanical properties Fracture toughness increases due to the distribution of residual pressure and the size distribution of the thickness of the coating.