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采用热模拟及透射电子显微镜结合纳米束能谱技术,研究了Mn-Mo-Nb-B系多元微合金钢奥氏体变形后等温过程中(松弛)的析出行为。实验结果表明:经变形后,在850℃和900℃保温过程中,Mn-Mo-Nb-B多元微合金钢析出颗粒尺寸在各个阶段均小于相同工艺下Nb-Ti钢中析出相的尺寸。统计结果显示,析出颗粒的尺寸均复合正态分布,并且峰位尺寸接近平均尺寸。析出相中Nb/Ti比随着松弛时间而增大。松弛阶段后期,Mo进入(Ti,Nb)(C,N)的晶格当中,其含量随着时间的延长而增加。
The precipitation behavior of austenite in Mn-Mo-Nb-B based microalloyed austenite after isothermal deformation (relaxation) was studied by means of thermal simulation and transmission electron microscopy combined with nano-beam spectroscopy. The experimental results show that the precipitated grain size of Mn-Mo-Nb-B multivariable microalloyed steel during 850 ℃ and 900 ℃ heat preservation is smaller than that of Nb-Ti steel in the same process. The statistical results show that the size of the precipitated particles are all compound normal distribution, and the peak size is close to the average size. The Nb / Ti ratio in precipitated phase increases with relaxation time. In the late relaxation phase, Mo enters the lattice of (Ti, Nb) (C, N) and its content increases with time.