钢铁钒钛2025，Vol.46Issue(5)：93-101,9.DOI:10.7513/j.issn.1004-7638.2025.05.010
轧制工艺对低碳微Nb钢变形抗力及其模型的影响研究
Study on the effect of rolling process on the deformation resistance of low carbon micro-Nb steel and its model
摘要
Abstract
The deformation resistance of metals during deformation is influenced by various factors.Among them,the deformation temperature,deformation process,and strain-induced phase transforma-tion all have an impact on the deformation resistance.This article focuses on low carbon micro-Nb steel and conducts thermal compression experiments using a Gleeble-3500 thermal simulation testing ma-chine.Simultaneously,the in-situ high-temperature morphology under conventional hot charging and high-temperature direct rolling was observed by high-temperature laser confocal microscope.The res-ults show that as the deformation temperature increases from 800℃ to 1050℃,the maximum deforma-tion resistance during high-temperature direct rolling decreases from 220.9 MPa to 138.9 MPa,while the maximum deformation resistance under the conventional hot charging process decreases from 227.9 MPa to 143.8 MPa.It is mainly because when the deformation temperature gradually increases,the thermal activation energy is enhanced,and the movement of dislocation becomes easier,which leads to a decrease in the deformation resistance.In addition,when the deformation temperature is the same,the deformation resistance of the conventional hot charging process is larger than that of the high-temperat-ure direct rolling process.It is due to the original austenite grain size under the conventional hot char-ging process(98.7 μm)is smaller than that under the high-temperature direct rolling process(107.0 μm).During the cooling process before reheating in the conventional hot charging process,a ferrite phase transformation occurs,and austenitization occurs again after reheating,making the newly formed aus-tenite grains smaller than the original austenite grains.Therefore,the smaller original austenite grain size under the conventional hot charging process leads to the stronger fine-grain strengthening effect,resulting in greater deformation resistance.Additionally,the experimental data of deformation resist-ance under different rolling processes were fitted and corrected by using the deformation resistance models proposed by Guan Kezhi and Zhou Jihua,and a deformation resistance prediction model for the tested steel during high-temperature deformation was established.The coefficient of determination R2 of the models for the conventional hot charging process and the high-temperature direct rolling process reaches 0.986 5 and 0.982 6 respectively,indicating a high fitting accuracy between the model's predic-tions and the experimental results.关键词
低碳微Nb钢/高温直轧/常规热装/晶粒尺寸/变形抗力模型Key words
low carbon micro-Nb steel/high temperature direct rolling/conventional hot charge/grain size/deformation resistance model分类
矿业与冶金引用本文复制引用
郑万杰,庞厚君,曾武,王运峰,徐光,田俊羽..轧制工艺对低碳微Nb钢变形抗力及其模型的影响研究[J].钢铁钒钛,2025,46(5):93-101,9.基金项目
武汉都市圈协同创新科技项目(2024070904020437) （2024070904020437）
湖北省揭榜制科技项目(2025BEB059). （2025BEB059）
