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.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第3期214-219,共6页
Transactions of Materials and Heat Treatment
关键词
低碳低合金高强钢
CCT
冷却速度
相变模型
low carbon HSLA steel
continuous cooling transformation(CCT)
cooling rate
phase transformation model
