非调质钢40MnV热变形后冷却相变动力学Phase transformation kinetics of a non-quenched and tempered steel 40MnV after hot deformation
王敏婷,李学通,刘晓东,杜凤山
摘要(Abstract):
为了实现非调质钢轴类件楔横轧热成形后控制冷却过程性能优化和节能减排,采用物理模拟手段对热变形后的非调质钢40MnV进行了连续冷却和等温冷却相变动力学研究。首先采用膨胀仪测定试验钢临界点Ac1、Ac3温度,然后利用Gleeble 3500热模拟机测定了40MnV钢的冷却过程相变动力学转变曲线,并分析了转变产物的显微组织。结果表明:冷却速度增大将减小铁素体的晶粒尺寸,同时也减小铁素体的体积分数;奥氏体晶粒尺寸和钒都对转变温度有影响,但在相变区快冷时奥氏体晶粒尺寸起主要作用,且晶粒尺寸减小将提高转变温度;相变区冷却速度为3℃/s时相变生成贝氏体,且其形态为典型的上贝氏体,而相变区冷却速度为6℃/s时对应转变的组织是马氏体;随着冷却速度的增加,析出过程中V(C,N)的数量增加,最大颗粒尺寸减小;等温冷却中V(C,N)析出物的形态为圆形和方形且数量很少,析出物的颗粒尺寸随转变温度的降低而减小。
关键词(KeyWords): 非调质钢;冷却;相变动力学;组织
基金项目(Foundation): 国家自然科学基金(51075352);; 河北省自然科学基金(E2012203028,E2011203090);; 燕山大学青年基金(13LGA002)
作者(Author): 王敏婷,李学通,刘晓东,杜凤山
DOI: 10.13289/j.issn.1009-6264.2014.09.010
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