冷变形后微合金钢碳氮化物的析出与组织

通过固溶时效处理，研究冷变形、时效温度等因素对微合金元素V，Ti，Nb的碳氮化物沉淀析出行为和组织演变过程的影响。结果表明：预变形试验钢的时效动力学曲线和未变形试验钢的时效动力学曲线具有相似的形状，预变形后达到的硬度峰值高，所需的时效时间缩短。预变形对含钒钢和含钛钢的碳氮化物析出动力学的影响很小，组织发生了再结晶并生成铁素体组织。预变形促进了含铌钢的碳氮化物较快析出，阻止再结晶，保持粒状贝氏体组织。

Carbonitride Precipitation and Structure in Microalloy Steel after Cold Deformation

This paper studies the effect of such factors as cold-deformation and aging on carbonitride precipitation and structural evolution in microalloyed steels bearing V,Ti and Nb by the solution ageing treatment.The results show that: the dynamic aging curve from pre-deformed samples is similar to that from un-deformed samples;the hardness value is high after the pre-deformation and the time needed for the peak value is short.It's also found that pre-deformation has little effect on the carbonitride precipitation of microalloyed steel bearing V and Nb,and the structure is recrystallized and transformed into ferrite.On the other hand,pre-deformation promotes carbonitride precipitation,prevents recrystallization,and keeps granular bainite.