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渗碳结构钢在民用发动机零件上应用较为普遍,如齿轮、联杆、轴类零件等,由于渗层表面硬度较高,磨削时易产生磨削裂纹。我厂生产的长江-750发动机主联杆,材质为20CrMnTi,内孔渗碳层厚0.9～1.2毫米,表而硬度HRC60～64。在1980年生产中,磨削时,发现成批零件出现严重龟纹、金属层剥落。为此,我们从零件材质、模锻件质量、热处理工艺、磨削工艺等方而进行了分析试验,
Carburized structural steel is widely used in civil engine parts, such as gears, connecting rods, shaft parts, etc. Because of the high surface hardness of the permeation layer, it is easy to produce grinding cracks when grinding. My factory production of the Yangtze River -750 engine main link, made of 20CrMnTi, inner hole carburized layer thickness 0.9 ~ 1.2 mm, hardness HRC60 ~ 64 table. In 1980, when grinding, it was found that there was a serious moire in the bulk parts and the metal layer was peeled off. To this end, we from the parts material, forging quality, heat treatment process, grinding process and other parties conducted an analysis test,