Hot deformation behavior of micro-alloyed steel using processing maps developed with different constitutive equations

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2022-01-01 DOI:10.2298/jmmb220114014t

S. Thakur, A. Das, B. Jha

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引用次数: 0

Abstract

The hot workability of microalloyed steel was studied in the deformation temperature range of 850-1200oC and strain rate of 0.001-100s-1. The constitutive relation of flow stress with temperature, strain rate and strain was established to construct processing maps of the microalloyed steel. The processing maps were constructed using conventional power law, integral method and Arrhenius equations. The developed processing maps were used to predict the optimal hot deformation conditions and validated with metallurgical examinations. The safe regime for hot working of the experimental steel was found to be in the intermediate temperature-strain rate range (1000-1150oC- 0.001-10 s-1), where the deformation process is dominated by dynamic recrystallization and dynamic recovery of the austenitic phase. The processing map constructed using Arrhenius equations increases continuously with an increase in deformation temperature and decrease in strain rate and does not reveal relevant information of hot workability with respect to deformation temperature and strain rate. The dynamic recrystallization behavior of experimental steel was affected by both deformation temperature and strain rate which is explained in detail through microstructural examination.

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利用不同本构方程的加工图研究微合金钢的热变形行为

研究了微合金钢在变形温度850 ~ 1200℃、应变速率0.001 ~ 100s-1范围内的热加工性能。建立了流动应力与温度、应变速率和应变的本构关系，构建了微合金钢的加工图。利用幂律法、积分法和阿伦尼乌斯方程构建了加工图。利用开发的加工图预测了最佳热变形条件，并通过金相检验进行了验证。实验钢的热加工安全范围为中间温度-应变速率范围(1000-1150oC- 0.001-10 s-1)，变形过程以动态再结晶和奥氏体相的动态恢复为主。利用Arrhenius方程构建的加工图随着变形温度的升高和应变速率的降低而不断增大，并没有显示出热加工性与变形温度和应变速率的相关信息。实验钢的动态再结晶行为受变形温度和应变速率的影响，并通过显微组织分析予以详细解释。

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来源期刊

Journal of Mining and Metallurgy Section B-Metallurgy 工程技术-冶金工程

CiteScore

2.00

自引率

40.00%

发文量

审稿时长

2 months

期刊介绍： University of Belgrade, Technical Faculty in Bor, has been publishing the journal called Journal of Mining and Metallurgy since 1965 and in 1997 it was divided in two independent journals dealing with mining and metallurgy separately. Since 2009 Journal of Mining and Metallurgy, Section B: Metallurgy has been accepted in Science Citation Index Expanded. Journal of Mining and Metallurgy, Section B: Metallurgy presents an international medium for the publication of contributions on original research which reflect the new progresses in theory and practice of metallurgy. The Journal covers the latest research in all aspects of metallurgy including hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, solidification, mechanical working, solid state reactions, materials processing, surface treatment and relationships among processing, structure, and properties of materials.