文章信息/Info

Title:

Correlation between Thermodynamics and Kinetics in Non-Equilibrium Phase Transformation of Metallic Material

作者:

張玉兵; 王慷; 彭浩然; 張旭; 陳豫增; 劉峰

（西北工業(yè)大學(xué) 凝固技術(shù)國家重點實驗室，陜西 西安 710072）

Author(s):

ZHANG Yubing; WANG Kang; PENG Haoran; ZHANG Xu; CHEN Yuzeng; LIU Feng

(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China)

關(guān)鍵詞:

熱力學(xué); 動力學(xué); 金屬材料; 相變; 相關(guān)性

Keywords:

thermodynamics; kinetics; metallic materials; phase transformation; correlation

DOI:

10.7502/j.issn.1674-3962.2019.03.07

文獻標志碼:

A

摘要:

金屬熱加工通過相變決定材料最終組織和性能。隨非平衡技術(shù)快速發(fā)展，熱加工工藝趨于極端化和多樣化，控制相變的熱力學(xué)與動力學(xué)機制從簡單近平衡條件下的相對獨立轉(zhuǎn)變?yōu)閺?fù)雜遠平衡條件下的高度關(guān)聯(lián)�；�于熱/動力學(xué)獨立處理的傳統(tǒng)理論已無法應(yīng)對上述相變涉及的機理描述、組織預(yù)測和過程控制。這已然成為高端制造業(yè)迫切需要解決的關(guān)鍵問題，也給金屬材料非平衡相變研究帶來了挑戰(zhàn)和機遇。針對純Fe沿Bain路徑的馬氏體切變、低合金鋼組織調(diào)控中的馬氏體相變、晶界遷移及晶粒長大熱穩(wěn)定性，整理出熱力學(xué)驅(qū)動力和動力學(xué)能壘的定量關(guān)聯(lián)，進而演繹并提出熱/動力學(xué)相關(guān)性。旨在探討相變熱力學(xué)和動力學(xué)間的固有規(guī)律，以指導(dǎo)典型工業(yè)用合金的微觀組織設(shè)計。

Abstract:

The final microstructure and property of metallic materials are determined by hot-working, in terms of phase transformations. With rapid development of the non-equilibrium technology, the processing of hot-working is becoming extreme and versatile, so that the thermodynamics and kinetics controlling the phase transformation is changed from the inter-independence corresponding to brief near-equilibrium process to the highly correlation corresponding to complicated extremely non-equilibrium process. Accordingly, the classical theory, basing on the independent treatment of thermodynamics and kinetics, has become unsuitable to describe the mechanism, predict the microstructure and control the process. This key problem needs to be solved urgently for high-end manufacturing industry, while brings challenges and opportunities for investigations of non-equilibrium phase transformation. The present review is focused on martensitic transition in Fe via Bain path, microstructure regulation by martensitic transformation in low-alloyed steels, and GB migration and the thermal stability of grain growth, quantitatively summarizing the correlation between thermodynamics and kinetics. On this basis, it is aimed to discuss the intrinsic law between thermodynamics and kinetics of phase transition, and thus guide the microstructure design for typical industrial alloys.