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将两种Mo含量不同的Nb-Mo-V微合金钢在1200℃固溶0.5 h后淬火,然后在450-650℃间不同温度回火4h,研究Mo含量对其在回火过程中组织变化和碳化物形成的影响。结果表明:低Mo含量微合金钢样品的硬度峰值出现在550℃回火,高Mo含量的出现在600℃回火;在650℃回火后,高Mo含量样品中碳化物颗粒尺寸比低Mo含量的小。其原因是,Mo偏聚在碳化物外层抑制了Nb、V从铁素体基体扩散进入碳化物,并降低了基体中C和合金元素向碳化物扩散的速率,从而抑制了碳化物颗粒长大。
The two kinds of Nb-Mo-V microalloyed steels with different Mo contents were solution-hardened at 1200 ℃ for 0.5 h and then tempered at different temperatures of 450-650 ℃ for 4h. The effects of Mo content on the microstructure of the Nb-Mo- And carbide formation. The results show that the hardness of microalloyed steel with low Mo content is tempered at 550 ℃, and the high Mo content is tempered at 600 ℃. After tempering at 650 ℃, the carbide particle size ratio is lower than that of Mo Small content. The reason is that the segregation of Mo in the carbide outer layer suppresses the diffusion of Nb and V from the ferrite matrix into the carbide and reduces the rate of diffusion of C and alloying elements into the carbide in the matrix and suppresses the growth of the carbide particles Big.