Separation of overlapping retained austenite decomposition and cementite precipitation reactions during tempering of martensitic steel by means of thermal analysis
Separation of overlapping retained austenite decomposition and cementite precipitation reactions during tempering of martensitic steel by means of thermal analysis
复制标题
DOI：
10.1016/j.tca.2011.09.001
复制
发表时间：
2011-11-10
影响因子：
3.5
通讯作者：
Leitner, H.
中科院分区：
文献类型：
--
作者：
Primig, S.;Leitner, H.
在马氏体钢的等时回火过程中，在一定程度上重叠的温度区域内会发生几种分解反应。对于这些反应的动力学研究，差示扫描量热法和扩张法是公认的互补实验技术。在碳含量增加的马氏体钢的回火阶段II和III，残余奥氏体的同时转变和渗碳体的析出在差示扫描量热仪和膨胀仪中都能产生强烈的信号。为了确定单个的动力学参数和反应焓，必须将这些反应分离，这是本研究的尝试。这是通过在差示扫描量热计中回火室温淬火以及液氮淬火试样来完成的。所研究的材料是SAE 1070，这是一种弹簧钢，淬火至室温后仍保留10%的奥氏体。详细说明了数据评估程序，并将结果与文献数据进行了比较。(C) 2011 Elsevier B.V.版权所有
During isochronal tempering of martensitic steels, several decomposition reactions take place within to some extent overlapping temperature regions. For the kinetic study of these reactions, differential scanning calorimetry and dilatometry are well established complementary experimental techniques. During tempering stages II and III of martensitic steels with increased carbon contents, the simultaneous transformation of retained austenite and the precipitation of cementite produce strong signals as well in the differential scanning calorimeter as in the dilatometer. For the determination of the individual kinetic parameters and reaction enthalpies, these reactions have to be separated, which is attempted in the present study. This is accomplished by tempering room temperature quenched as well as liquid nitrogen quenched specimens in a differential scanning calorimeter. The investigated material is the SAE 1070, a spring-steel with 10 vol% retained austenite after quenching to room temperature. The data evaluation procedure is explained in detail and the results are compared with literature data. (C) 2011 Elsevier B.V. All rights reserved.