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为深入了解12CrMo钢的循环塑性变形规律,本文在已有工作的基础上进一步研究循环加载所形成的疲劳位错结构特征。研究用料为12CrMo钢,其主要元素含量为0.10％C,0.53％Cr和0.48％Mo。热轧圆钢锻成板状毛坯后,于930℃加热,进行退火处理,获得等轴状合金铁素体和少量珠光体的显微组织。应用Amsler型高频疲劳试验机进行循环拉伸试验。加载频率为180Hz。试样在疲劳极限(167MPa)的循环应力作用下,经10~7周的循环加载后,
In order to further understand the cyclic plastic deformation law of 12CrMo steel, this paper further studies the structural characteristics of fatigue dislocation formed by cyclic loading based on the existing work. The research materials for the 12CrMo steel, the main elements are 0.10% C, 0.53% Cr and 0.48% Mo. After the hot-rolled round steel is forged into a plate-shaped blank, it is heated at 930 ° C. and annealed to obtain the microstructure of the equiaxed alloy ferrite and a small amount of pearlite. Application of Amsler-type high-frequency fatigue testing machine for cyclic tensile test. Load frequency is 180Hz. The specimen fatigue load limit (167MPa) under cyclic stress, after 10 to 7 weeks of cycle loading,