20CrNi2MoV钢连续冷却过程中的相变行为  

Continuous cooling transformation behavior of 20CrNi2MoV steel

作　　者：张建[1] 李长生[1] 李彬周 姜乐[2] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]瓦房店轴承集团有限责任公司,辽宁大连113001

出　　处：《辽宁科技大学学报》2017年第1期60-66,共7页Journal of University of Science and Technology Liaoning

基　　金：国家高新技术研究发展计划(863计划)项目(2012AA03A503);高等学校博士学科点专项科研基金项目(20130042110040)

摘　　要：利用热力模拟试验机研究了20CrNi2MoV钢在变形和未变形条件下的连续冷却相变行为及微观组织演变规律,绘制了该实验钢静态和动态连续冷却转变(CCT)曲线,分析了合金元素、冷却速度和变形条件等对其连续冷却相变行为的影响。结果表明:20CrNi2MoV钢中Cr、Ni、Mo等合金元素使得过冷奥氏体稳定性增强,贝氏体相变可以在较宽的中温转变温度区间发生;随着冷却速度的增加,20CrNi2MoV钢的铁素体相变温度下降,铁素体扩散型相变受到抑制,贝氏体中温区相变得到加强;变形使得20CrNi2MoV钢CCT曲线的铁素体和珠光体转变线明显左移,并且由于变形作用,贝氏体相变温度提高。The continuous cooling transformation behavior and microstructure evolution of the 20CrNi2MoV steel on the condition of deformation and un-deformation were simulated on a thermomechanical simulator. The continuous cooling transformation （CCT） curves were plotted. And the influence of alloying elements, cooling rates, deformation processes on the transformation characteristics were analyzed. The results show that bainite transformation can occur in relatively wide intermediate temperature range due to the alloying ele- ments＇ stabilization effect on the undercooled austenite. With the increasing of cooling rate, Ferrite transfor- mation temperature is decreased and the ferrite transformation is suppressed while bainite transformation is strengthened. Due to the effect of deformation, the CCT curves are shifted to left and bainite transition temper- ature is increased.

关 键 词：20CrNi2MoV钢 连续冷却相变 CCT曲线 贝氏体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]