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经成分优化获得一种新型的贝氏体轴承钢GCr15SiMoAl,通过盐浴等温淬火不同时间及油淬工艺获得不同的组织,利用Gleeble3500研究了试验用钢充氢前后的压缩变形行为,并与常规的GCr15轴承钢进行了对比。结果表明,GCr15SiMoAl轴承钢经0.5h等温获得了贝氏体铁素体、残留奥氏体及马氏体的复合组织,其综合压缩性能最好;随着盐浴等温时间的延长,抗压强度逐渐降低,相对压缩率先升高后降低。且GCr15SiMoAl轴承钢在所有工艺下获得的性能均优于传统的GCr15轴承钢。氢对轴承钢的抗压强度影响较小,但是由于氢会促进残留奥氏体发生应变诱发马氏体转变,严重降低了轴承钢的塑性。
A new type of bainite bearing steel, GCr15SiMoAl, was obtained by component optimization. Different structures were obtained by isothermal quenching in salt bath at different times and by oil quenching. Gleeble3500 was used to study the compressive deformation behavior before and after hydrogenation of test steel. GCr15 bearing steel was compared. The results show that the composite structure of bainitic ferrite, retained austenite and martensite has the best comprehensive compressibility. The compressive strength of GCr15SiMoAl bearing steel increases with the isothermal time of salt bath, Gradually decreased, the relative compression rate first increased and then decreased. And GCr15SiMoAl bearing steel performance obtained in all processes are superior to the traditional GCr15 bearing steel. Hydrogen has little effect on the compressive strength of bearing steel, but due to the hydrogen will promote the strain-induced martensitic transformation of retained austenite, which seriously reduces the plasticity of bearing steel.