低碳低合金高强钢的连续转变行为及其相变模型  

Continuous cooling transformation behavior and phase transformation model in low carbon HSLA steel

作　　者：蔡恒君[1] 高喆[2] 宋仁伯[2] 裴宇 于三川[2] 

机构地区：[1]鞍钢股份有限公司冷轧厂,辽宁鞍山114000 [2]北京科技大学材料科学与工程学院,北京100083 [3]精密制造技术航空科技重点实验室,北京100076

出　　处：《材料热处理学报》2015年第3期214-219,共6页Transactions of Materials and Heat Treatment

摘　　要：用DIL805型热膨胀仪研究了低碳低合金高强钢(HSLA)奥氏体连续冷却过程的相变规律,用膨胀法结合金相法建立了实验钢奥氏体的连续冷却转变曲线(CCT),随着冷却速度的增加,实验钢的组织分别发生了铁素体转变、珠光体转变、贝氏体转变和马氏体转变。建立了相变点-冷却速度以及相变量-冷却速度之间的数学方程,并回归计算了拟合度较高的相变模型。结果表明,计算值与试验值之间能很好的吻合,证明了该相变模型的可行性。Phase transformation of austenite continuous cooling process in low carbon HSLA steel was researched by DIL805 thermal mechanical simulate. The austenite continuous cooling transformation( CCT) curve of the tested steel was determined by dilatometry and metallography. With the increase of cooling rate,microstructure of the steel is the ferrite transformation,pearlite transformation,bainite transformation and martensite transformation,respectively. Mathematical equations of phase transformation point-cooling rate and phase variable-cooling rate were established,and phase transformation model of high fit degree was gained by regression calculation. The results show that the calculated value and experimental value are nearly similar,so the phase transformation model is feasible.

关 键 词：低碳低合金高强钢 CCT 冷却速度 相变模型 

分 类 号：TG142.1[一般工业技术—材料科学与工程]