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利用Gleeble 1500模拟试验机对含Nb低碳钢的热变形行为进行了实验研究,对热变形稳态流变应力和发生动态再结晶时的峰值流变应力与变形条件的关系进行了回归分析,阐述了由于形变诱发Nb(C,N)化合物沉淀对形变激活能的影响,在对金属塑性变形过程中位错增值,螺型位错交滑移回复和刃型位错攀移回复过程分析的基础上,建立了可预测动态回复和动态再结晶同时发生情况下的流变应力理论模型,并对不同变形条件下的流变应力进行了预测,预测结果与实验结果相当吻合。
The thermal deformation behavior of Nb-containing mild steel was experimentally studied by Gleeble 1500 simulator. The regression analysis of the relationship between the peak flow stress and the deformation condition during the steady flow stress of hot deformation and the dynamic recrystallization occurred. The effect of precipitation on the activation energy of deformation due to the deformation induced precipitation of Nb (C, N) compounds is described. During the plastic deformation process, the value of dislocation value, the reciprocal displacement of screw dislocation and the recovery process of edge dislocation climbing are analyzed On the basis of the above, a theoretical model of flow stress under the condition of simultaneous dynamic recrystallization and dynamic recrystallization was established, and the flow stress under different deformation conditions was predicted. The predicted results are in good agreement with the experimental results.