Hot deformation and dynamic recrystallization behaviours of a Nb–Ti bearing HSLA steel simulated by compact strip production process

作者：Zhixiang Fu, Gengwei Yang, Xinping Mao, Ruyang Han, Yaowen Xu, Deming Xu · 发表于：Journal of Materials Research and Technology · 年份：2025 · DOI：10.1016/j.jmrt.2025.05.134 · 被引用次数：11 · 研究领域：Metallurgy and Material Forming、Microstructure and Mechanical Properties of Steels、Microstructure and mechanical properties

The hot deformation and dynamic recrystallization (DRX) behaviours of a Nb–Ti bearing HSLA steel simulated by the compact strip production (CSP) process were investigated with the deformation interval of 900–1150 °C/0.01–10 s −1 . According to the peak stress, the constitutive equation was constructed, and the hot deformation activation energy (Q def ) was determined to be 447.153 kJ/mol. Based upon the analysis of the hot processing maps for various true strains, high deformation temperatures or true strain, along with low strain rates are favorable for obtaining a high power dissipation coefficient ( η ), which promotes the DRX and enhances the hot workability. With the deformation interval changed from 900 °C/0.01–1 s −1 and 950 °C/0.1–1 s −1 to 950 °C/0.01 s −1 and 1000–1150 °C/0.01–10 s −1 , the softening mechanism transitioned from discontinuous DRX (DDRX) to continuous DRX (CDRX) + DDRX, the corresponding microstructure transitioned from necklace structure to equiaxed DRX grain. Moreover, the DRX critical strain model and grain size model were constructed based on Z parameter, which has a high degree of validity and accuracy.