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采用不同旋转速度进行搅拌摩擦加工Cr12MoV模具钢超细晶表面层的制备,并测试分析超细晶表面层的组织与性能。结果表明,采用搅拌摩擦加工方法可在Cr12MoV模具钢表面制备出晶粒尺寸为4~8μm的超细晶表面层。与常规氮化处理Cr12MoV模具钢相比,采用搅拌摩擦加工处理的Cr12MoV模具钢磨损体积减小68%、冲击吸收功增大72%。随旋转速度从200 r/min增大至1 000 r/min,超细晶模具钢的晶粒先细化后粗化,耐磨损性能和抗冲击性能均先提高后下降。搅拌摩擦加工时的旋转速度优选为600 r/min。
The preparation of ultra-fine grained Cr12MoV die steel with different rotating speed was studied. The microstructure and properties of the superfine grained surface layer were tested and analyzed. The results show that the ultrafine grain surface layer with grain size of 4 ~ 8μm can be prepared on the surface of Cr12MoV steel by friction stir processing. Compared with conventional nitrided Cr12MoV die steel, the wear volume of Cr12MoV die steel with friction stir processing decreased by 68% and the impact absorption work increased by 72%. With the rotation speed increasing from 200 r / min to 1000 r / min, the grains of the ultrafine-grained die steel are refined and roughened first, then the wear resistance and the impact resistance of the steel increase and then decrease. The rotational speed during the friction stir processing is preferably 600 r / min.