Microstructure evolution and constitutive modeling of Cu-bearing high-strength low-alloy steel during hot deformation

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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Abstract

The microstructural evolution of austenite during hot deformation determines the mechanical properties of steel products. Consequently, industrial applications necessitate a thorough comprehension and modeling of this process. Under varied hot deformation conditions, the flow stress, microstructure evolution, and constitutive modeling of a Cu-bearing steel were examined. At various temperatures and strain rates, compression experiments are conducted, and the resulting microstructures were studied by electron backscatter diffraction (EBSD). Our results indicate that fine prior austenite grains with an average diameter of 22.1 m and a high-angle grain boundary density of 0.25 m1 were produced at a deformation temperature of 950 °C and a strain rate of 1 s−1. The dominating rotating cube components ({001}<110>) in the sample deformed at 1150 °C were gradually replaced by the γ-fiber texture component as the deformation temperature decreased. To accurately predict the flow behavior of this steel, we proposed an improved Arrhenius constitutive model that accounts for strain rate and adiabatic temperature rise. With a correlation coefficient (Rc) of 0.9936, a root mean square error (RMSE) of 4.92%, and a relative error (δ) of 6.05 MPa, our results demonstrate that this model predicts the flow stress of the experimental steel with good precision. This research contributes to the development of high-performance steel products by shedding light on the microstructural evolution and flow behavior of Cu-containing steels under hot deformation conditions.

热变形过程中含铜(Cu)高强度低合金钢的显微组织演化和结构建模
热变形过程中奥氏体的微观结构演变决定了钢铁产品的机械性能。因此,工业应用需要对这一过程进行全面理解和建模。在不同的热变形条件下,对含铜钢的流动应力、微观结构演变和构成模型进行了研究。在不同温度和应变率下,进行了压缩实验,并通过电子反向散射衍射(EBSD)研究了由此产生的微观结构。结果表明,在变形温度为 950 ℃、应变速率为 1 s-1 时,产生了平均直径为 22.1 m、高角度晶界密度为 0.25 m1 的细小先行奥氏体晶粒。随着变形温度的降低,1150 °C变形样品中的主要旋转立方体成分({001}<110>)逐渐被γ纤维纹理成分所取代。为了准确预测这种钢的流动行为,我们提出了一种考虑到应变率和绝热温升的改进阿伦尼乌斯构成模型。相关系数 (Rc) 为 0.9936,均方根误差 (RMSE) 为 4.92%,相对误差 (δ) 为 6.05 MPa。这项研究通过揭示含铜钢在热变形条件下的微观结构演变和流动行为,为高性能钢产品的开发做出了贡献。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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