低合金钢TMCP中相变热力学/动力学相关性探讨  

DISCUSSIONS ON THE CORRELATION BETWEEN THERMODYNAMICS AND KINETICS DURING THE PHASE TRANSFORMATIONS IN THE TMCP OF LOW-ALLOY STEELS

作　　者：刘峰[1] 王慷[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《金属学报》2016年第10期1326-1332,共7页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目51431008;凝固技术国家重点实验室自主研究课题项目117-TZ-2015资助~~

摘　　要：基于经典相变理论,分析相变中关键热力学/动力学参量,提出相变热力学/动力学相关性概念;结合低合金钢控制轧制与控制冷却工艺(TMCP)涉及相变的实验研究,总结热力学驱动力、动力学能垒与相变条件间关联;进而探讨相变中热力学/动力学相关性;最后对热力学/动力学相关性的潜在应用进行了展望.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.

关 键 词：低合金钢 相变 热力学 动力学 相关性 

分 类 号：TG113.12[金属学及工艺—物理冶金]