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采用SEM,TEM和物理化学相分析等方法对铁素体基Ti-Mo微合金钢在2种不同轧制工艺下的析出相分布和粒度进行了观察和统计,结合热力学和动力学计算研究了γ相区变形过程中形变储能对诱导析出的影响,分析了γ相区形变诱导析出量对后续γ→α相变以及相变后α相基体中继续析出时析出相的临界晶核尺寸、相对形核率和相对沉淀开始时间的影响.结果表明,在总变形量相同的情况下,与γ相再结晶区和未再结晶区两阶段轧制相比较,采用γ相再结晶区单阶段轧制更有利于获得析出量大、尺度分布均匀的个位纳米级碳氮化物,这类碳氮化物占析出物总量的75%(质量分数).
The precipitation phase distribution and particle size of ferritic Ti-Mo microalloyed steel under two different rolling processes were observed and analyzed by means of SEM, TEM and physical-chemical phase analysis. The thermodynamic and kinetic calculations were carried out The influence of deformation energy storage during the γ phase transformation on the induced precipitation is analyzed. The critical crystal nucleus size of precipitated phase in the γ phase transformation is analyzed for the subsequent γ → α phase transformation and the subsequent precipitation in the α phase matrix. Relative nucleation rate and relative precipitation start time.The results show that compared with the two-stage rolling of γ-phase recrystallization and non-recrystallization in the same total deformation, single-phase γ recrystallization Rolling is more conducive to the precipitation of a large, uniform distribution of a single-dimensional nanocarbons, carbonitrides accounted for 75% of the total amount of precipitates (mass fraction).