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研究了不同淬火温度对冷轧变形后的30CrMo减震簧钢的精细组织的影响。研究表明:随淬火温度增加,试验钢中残留奥氏体量增加,且形态由薄膜状向块状转变;碳化物数量增加,形态由短棒状和球状向椭球状转变。试验钢经900℃×10 min油冷+600℃×60 min空冷后获得回火索氏体+弥散分布的细小碳化物+薄膜状残留奥氏体。薄膜状的残留奥氏体均匀分布在铁素体晶内或F/MC相界面,将铁素体基体分割形成了超细化的亚结构甚至超亚单元。这种结构具有良好的形变协调能力,并能有效松弛微观应力集中。大量椭球状的碳化物沿亚单元和超亚单元的界面处析出,弥散分布,使之具有良好的细晶韧化和析出强化效果。
The effect of different quenching temperature on the microstructure of 30CrMo damper steel after cold rolling deformation was studied. The results show that with the increase of quenching temperature, the amount of retained austenite in the test steel increases and the morphology changes from thin film to massive. The amount of carbides increases and the morphology changes from short rod to spherical to ellipsoidal. The test steel was cooled by 900 ℃ for 10 min and air-cooled at 600 ℃ for 60 min to obtain tempered sorbite + fine carbide dispersed in the film and retained austenite in the film. The film-like residual austenite is uniformly distributed in the ferrite crystal or the F / MC phase interface, and the ferrite matrix is divided to form a superfine sub-structure or even an ultra-subunit. This structure has good deformation coordination, and can effectively relax the micro-stress concentration. A large number of ellipsoidal carbides along the sub-unit and super-sub-unit interface precipitation, dispersion distribution, so that it has fine fine grain toughening and precipitation strengthening effect.