碳锰钢中有亚微米和微米两种晶粒尺寸的铁素体,在亚临界时效热处理中具有不同的晶粒长大行为.亚微米尺寸的铁索体在亚临界时效热处理中逐渐长大,材料的硬度逐渐降低;与亚微米尺寸的铁索体不同,微米尺寸的铁素体在亚临界热处理中具有很高的稳定性,晶粒尺寸和材料的硬度基本保持不变.铁素体晶粒的长大行为与晶粒的表面能和晶粒中的第二相有关.
There were two kinds of ferrite grain size in C-Mn steel, i.e. submicron-sized ferrite and micron-sized ferrite. Difference in grain growth during sub-critical annealing in these two ferrite grain sizes was investigated. Subrnicron-sized ferrite was metastable ferrite, which gradually coarsened and softened. This implied a renewed grain coarsening challenge for its wide engineering applications. In marked contrast, micron-sized ferrite was more stable and remained little change in grain size and hardness. This difference in grain growth could be explained by the present thermodynamic considerations, i.e. the grain boundary energy and the second phase particles.
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