在透射电镜下原位观察低碳低钒钢中细小第?相沉淀粒子(平均直径86nm)对微裂纹的形成与扩展的影响.结果表明,细小的第二相沉淀粒子(VC)群将通过阻碍裂纹尖端前方区域的位错运动,减缓局部区域薄化过程,阻碍微裂纹的形成和扩展,从而对微裂纹的扩展路径起一定的控制作用,而单个细小的第二相沉淀粒子对这种作用的影响将不大
The fine second phase particles, average size about 86 nm, precipitating inferrite matrix of low carbon low vanadium steel will hinder the movement of dislocations infront of crack-tip, retard the thinning process in local area, and then proceed to impede theinitiation and propagation of micro-cracks. The propagating path of micro-cracks is control-led partly by the distribution of precipitates, a single particle has the action aforementionedweakly.
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