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采用OM、SEM、TEM、DSC、XRD等手段,研究了V含量变化(0.5%、0.7%、0.9%、1.1%)对D2钢组织及其性能的影响规律。结果表明,随着V含量增加,D2钢铸态晶粒细化,M_7C_3共晶碳化物数量增加,碳化物形态由细长的棒状逐渐转变为片层状。与片层状碳化物相比,棒状碳化物热稳定性较低,在加热过程中易发生断开和球化,使碳化物尺寸细化;同时,淬火加热时易于溶解,使基体固溶度提高。V含量为0.9%时,D2钢回火态硬度可达60 HRC以上,冲击韧性达20 J/cm~2,具有最佳的综合使用性能。
The effects of V content (0.5%, 0.7%, 0.9%, 1.1%) on the microstructure and properties of D2 steel were studied by means of OM, SEM, TEM, DSC and XRD. The results show that with the increase of V content, the as-cast grain of D2 steel is refined and the amount of M_7C_3 eutectic carbide is increased. The shape of carbide is gradually changed from slender rod to lamellar. Compared with the lamellar carbide, the lower the thermal stability of the rod-shaped carbide in the heating process is prone to broken and spheroidization, the carbide size refinement; the same time, easy to dissolve quenching heating, the matrix solid solubility improve. When the content of V is 0.9%, the hardness of D2 steel is above 60 HRC and the impact toughness is up to 20 J / cm ~ 2, which has the best comprehensive performance.