The addition of anadium and nitride alloy on the solidification structure and hardness of M2 high-speed steel
In order to fully exploit the potential role of vanadium-Nitride alloy on high-speed steel,the evolution of solidification structure and hardness of M2 high-speed steel with vanadium-Nitride alloy addition had been investigated by using a rapid solidification melt-sampling apparatus,where the vana-dium-nitride alloy was added into the standard M2 high-speed steel specified by GB/T 9943-2008,an experimental exploration was conducted.Thermo-Calc and JMatPro software,in combination with op-tical microscopy,scanning electron microscopy,X-ray diffraction apparatus,and hardness tester,were employed for the observation of substrate grain morphologies,sizes,and distributions at various loca-tions subsequent to the solidification of M2 high-speed steel with different N content(0.036 5％,0.016 5％).Additionally,observations were made on carbide types,morphologies,sizes,and distributions,while hardness variations were measured.The results indicate that the addition of vanadium-nitride alloy can help refining the size of substrate grains.In the case of the 0.036 5％N experimental steel,equiaxed grains were observed at the center,1/2 radius,and periphery;whereas the 0.016 5％N experimental steel exhibited columnar grains at 1/2 radius.The addition of vanadium-nitride alloy could not alter the precipitation type of carbides during the solidification process,but it facilitated the fragmentation of carbides.The addition of vanadium-nitride alloy resulted in higher hardness.The increased hardness in the case of the 0.036 5％N experimental steel is attributed to the refinement of substrate grains and an augmented quantity of M(C,N)particles.
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