室温变形对低碳钢中析出物的影响

Effects of Deformation at Room Temperature on the Precipitates in Low Carbon Steel

以一种低碳微合金钢为对象,通过热模拟实验研究了室温变形对最终组织中析出物的分布、尺寸以及成分等的影响.实验用试样的原始组织为铁素体、珠光体加少量贝氏体,采用一种快速加热短时保温的工艺方法探讨室温变形的作用.研究结果表明:室温变形通过影响试样内部的位错密度,不仅有效增加了析出物的弥散程度,还能够在一定程度上降低析出物的尺寸;从试样的组织形貌来看,采用该工艺,室温变形在维持等轴晶的前提下还有效减小了晶粒尺寸;另外,与未施加室温变形的试样比较发现,室温变形能够在一定程度上促进溶解度较大的微合金元素V的析出.

For a kind of low carbon micro-alloyed steel, a thermal simulation test was conducted with samples of F＋B＋P microstructure and the effects of its cold deformation at room temperature on the distribution, size and composition of precipitates were investigated via a technological process for rapid heating and short holding time. The results indicate that the dispersity of the precipitates increases with the change in dislocation density which is influenced by the deformation at room temperature, while the size of the precipitates decreases to a certain extent. And the size of equiaxed grains decreases with increasing deformation at room temperature in view of their morphology. Also, the deformation at room temperature can expedite the vanadium precipitation to a certain extent because of its high solubility.