The dynamic and static softening mechanisms of LX82A steel in double-pass hot compression deformation

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2025-09-08 DOI:10.1007/s10853-025-11412-5

Jing Yang, Qingjuan Wang, Tongyao Yang, Zhongze Du, Wen Wang, Kuaishe Wang

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引用次数: 0

Abstract

This research aims to elucidate the regulatory mechanisms of temperature, strain, and inter-pass holding time on the static softening behavior of LX82A steel during double-pass hot deformation and to uncover the impact of dynamic-static softening coupling on the evolution of microstructure. In this study, single- and double-pass hot compression tests were performed on LX82A steel using the Gleeble-3500 thermal simulator. The dynamic and static softening behavior, as well as the evolution of microstructure, was investigated under deformation temperatures ranging from 900 to 1100 °C, a strain rate of 1 s⁻¹, and holding times varying from 1 to 120s. The results showed that the stress values in the double-pass flow curve decreased as temperature, deformation amount, and holding time increased, and the stress values were all higher than those in the single-pass flow curves. At 900 °C, the static softening mechanism was mainly static recovery. As the temperature increased, the static softening mechanism changed from static recovery to static recrystallization. The nucleation and growth mechanism of static recrystallization followed the strain-induced boundary migration (SIBM) mechanism. Compared to single-pass deformation, the double-pass deformation process was more advantageous for grain refinement. By combining static softening rate and the Avrami equation, a static recrystallization kinetics model was established, and the activation energy for static recrystallization of LX82A steel was calculated to be 218.32 kJ/mol.

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LX82A钢在双道热压缩变形中的动、静态软化机理

本研究旨在阐明温度、应变和间道保温时间对LX82A钢在双道热变形过程中静态软化行为的调节机制，揭示动静软化耦合对组织演变的影响。本文采用Gleeble-3500热模拟器对LX82A钢进行了单道和双道热压缩试验。在900 ~ 1100℃的变形温度、1 s⁻1的应变速率和1 ~ 120s的保温时间下，研究了其动态和静态软化行为以及微观结构的演变。结果表明：随着温度、变形量和保温时间的增加，双通道流动曲线的应力值减小，且均高于单通道流动曲线；900℃时，静态软化机制以静态恢复为主。随着温度的升高，静态软化机制由静态恢复转变为静态再结晶。静态再结晶的成核生长机制遵循应变诱导边界迁移（SIBM）机制。与单道次变形相比，双道次变形更有利于晶粒细化。结合静态软化速率和Avrami方程，建立了LX82A钢静态再结晶动力学模型，计算出LX82A钢静态再结晶的活化能为218.32 kJ/mol。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.