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通过热模拟和透射电镜(TEM)等研究方法对三种不同V含量的V-Mo-N微合金钢在贝氏体铁素体基体中析出粒子分布、形貌和尺寸进行了观察和分析。结果表明:在V-Mo-N微合金钢中,当Mo的添加量较低时,析出粒子为V(C,N),Mo元素全部固溶于基体中起到固溶强化作用,并不会形成Mo的碳氮化物析出。随着V含量的提高,组织中的贝氏体板条逐渐变细并向粒状贝氏体转变。V含量在0.05%~0.16%时,试验钢析出量随V含量增加而增加,同时,钢的硬度也增加。
The distribution, morphology and size of the precipitated V-Mo-N microalloyed steels in bainitic ferrite matrix were observed and analyzed by thermal simulation and transmission electron microscopy (TEM). The results show that V (C, N) precipitates in the V-Mo-N microalloyed steel when the Mo content is low, and all of the Mo elements dissolve in the matrix and do not dissolve in the matrix. The formation of Mo carbonitride precipitation. With the increase of V content, the bainite laths in the microstructure become thinner and transform into granular bainite. When the content of V is 0.05% ~ 0.16%, the amount of precipitation of test steel increases with the increase of V content, meanwhile, the hardness of steel also increases.