PREDICTION OF CARBON CONCENTRATION AND FERRITE VOLUME FRACTION OF HOT-ROLLED STEEL STRIP DURING LAMINAR COOLING

查看全文 作　　者：Y.T. [1,2]Zhang;C.Z. [1]Wang;D.Z. [2]Li;Y.Y. [2]Li 机构地区：[1]School of Material Science and Engineering, Shenyang Ligong University, Shenyang 110168, China;[2]Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2007年第20卷第4期,共7页 摘　　要：A phase transformation model was presented for predicting the phase fraction transformed and the carbon concentration in austenite for austenite to ferrite transformation during laminar cooling on run-out table in hot rolling strip mill. In this model, the parameter k in Avrami equation was developed for carbon steels. The wide range of chemical composition, the primary austenite grain size, and the retained strain were taken into account. It can be used to predict the ferrite volume fraction and the carbon concentration in austenite of hot-rolled steel strip during laminar cooling on run-out table. The coiling temperature controlling model was also presented to calculate the temperature of steel strip. The transformation kinetics of austenite to ferrite and the evolution of carbon concentration in austenite at different temperatures during cooling were investigated in the hot rolled Q235B strip for thickness of 9.35, 6.4, and 3.2mm. The ferrite volume fraction along the length of the strip was also calculated. The calculated ferrite volume fraction was compared with the log data from hot strip mill and the calculated results were in agreement with the experimental ones. The present study is a part of the prediction of the mechanical properties of hot-rolled steel strip, and it has already been used on-line and off-line in the hot strip mill. 关 键 词：碳含量 铁氧体 体积分数 薄层冷却 热轧