Abstract

Thermal mechanisms of microstructural refinement in steels were reviewed. These include thermal cycling, martensite process, and static recrystallization (SRX), in which the dominant stage of microstructural refinement is governed by an annealing treatment of a deformed or an undeformed material. Recent progress in grain refinement by thermal cycling for the body-centered cubic, face-centered cubic, and dual phase (DP) steels was introduced. The application of the cold rolling and subsequent annealing of a martensite starting structure (martensite process) for grain refinement of low-carbon and DP steels was reviewed. The formation and reversion of strain-induced martensite in metastable austenitic stainless steels and their effects on the microstructural evolutions were critically discussed. Moreover, the repetition of the martensite process and its limitations were explained. Important findings on the SRX of ferrite and austenite for grain refinement as well as the recrystallization kinetics were presented. Finally, the concepts of controlled rolling for grain refinement and the interaction of austenite recrystallization and strain-induced precipitation in microalloyed steels during thermomechanical processing were also reviewed. This short overview presents the opportunities that the conventional and innovative processing routes can offer for grain refinement of steels.

Graphic Abstract

中文翻译：

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钢中晶粒细化的热机理：综述

摘要

综述了钢中微观组织细化的热机理。这些包括热循环，马氏体工艺和静态再结晶（SRX），其中微结构细化的主要阶段由变形或未变形材料的退火处理控制。介绍了通过热循环对体心立方，面心立方和双相（DP）钢进行晶粒细化的最新进展。综述了冷轧和马氏体起始组织随后的退火（马氏体工艺）在低碳和DP钢晶粒细化中的应用。严格讨论了亚稳态奥氏体不锈钢中应变诱发马氏体的形成和回复及其对微观组织演变的影响。此外，解释了马氏体过程的重复及其局限性。提出了关于铁素体和奥氏体晶粒细化的SRX以及重结晶动力学的重要发现。最后，还综述了控制轧制以细化晶粒的概念，以及微合金钢在热机械加工过程中奥氏体再结晶和应变诱发析出的相互作用。简短的概述为传统和创新的加工路线提供了精炼钢晶粒的机会。还综述了控制轧制以细化晶粒的概念，以及微合金钢在热机械加工过程中奥氏体再结晶和应变诱发析出的相互作用。简短的概述为传统和创新的加工路线提供了精炼钢晶粒的机会。还综述了控制轧制以细化晶粒的概念，以及微合金钢在热机械加工过程中奥氏体再结晶和应变诱发析出的相互作用。简短的概述为传统和创新的加工路线提供了精炼钢晶粒的机会。

图形摘要