低合金钢TMCP中相变热力学/动力学相关性探讨*
收稿日期: 2016-08-01
网络出版日期: 2016-08-24
基金资助
* 国家自然科学基金项目51431008和凝固技术国家重点实验室自主研究课题项目117-TZ-2015资助
DISCUSSIONS ON THE CORRELATION BETWEEN THERMODYNAMICS AND KINETICS DURING THE PHASE TRANSFORMATIONS IN THE TMCP OF LOW-ALLOY STEELS
Received date: 2016-08-01
Online published: 2016-08-24
Supported by
Supported by National Natural Science Foundation of China (No.51431008) and Research Fund of the State Key Laboratory of Solidification Processing (No.117-TZ-2015)
刘峰 , 王慷 . 低合金钢TMCP中相变热力学/动力学相关性探讨*[J]. 金属学报, 2016 , 52(10) : 1326 -1332 . DOI: 10.11900/0412.1961.2016.00341
Thermo-mechanical control process (TMCP) plays a key role in the manufacturing of hot-rolled low-alloy steels, as well as the optimization of microstructures and properties. However, the various phase transformations involved in the TMCP of steels and its impact on the microstructures/properties are still not fully understood. In the present work, on the basis of classical theories of phase transformations and previous experimental results, the key parameters controlling the phase transformation processes are analyzed, from which the correlation between thermodynamics and kinetics of the phase transformations are proposed; then, this correlation in the phase transformations of low-alloy steels and its effect on the competing mechanisms of transformations are analyzed; based on well-established theories (i.e. the first-principles calculations and the double well potential in phase field methods), the energetics of the Bain path of Na and the fcc/bcc transformation of Fe are calculated to demonstrate the correlation between thermodynamics and kinetics. Eventually, the current work is summarized and the potential applications of the correlation between thermodynamics and kinetics of phase transformations are proposed.
Key words： low-alloy steel; phase transformation; thermodynamics; kinetics; correlation
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