Mechanism of Microcrystalline Evolution Behavior during Straightening Process Based on Voronoi Method with Different Process Parameters

TONG Ze; HAN Xing; LI Chang; YU Anliang; WANG Ruhan

doi:10.3969/j.issn.1674-6457.2026.08.022

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (8) : 242-254. DOI: 10.3969/j.issn.1674-6457.2026.08.022

Advanced Manufacturing Technology and Equipment

Mechanism of Microcrystalline Evolution Behavior during Straightening Process Based on Voronoi Method with Different Process Parameters

TONG Ze, HAN Xing^*, LI Chang, YU Anliang, WANG Ruhan

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Abstract

The work aims to explore the micrograin evolution mechanism of stainless steel billets during the straightening process, and thereby reveal the instantaneous evolution laws of temperature and stress under the influence of grain size during the straightening process of stainless steel billets with different process parameters. With a continuous casting unit in a steel plant as the research object, a three-dimensional finite element micro-grain model coupled with thermal-plastic multi-field was established through numerical simulation. The multi-grain structure of the steel billet was generated using the Voronoi method. Hardness data were obtained through nano-indentation experiments, and the variability coefficient of grain mechanical properties was calculated. Based on the characteristics of normal distribution, grains were divided into seven categories, which were randomly assigned to different material properties using Python. The stress and temperature distributions at the grain scale during the straightening process were simulated and analyzed. After introducing grain variability, the stress field exhibited local mutation characteristics highly consistent with the grain morphology; the temperature field showed local differences. When the reduction ratio increased from 5% to 15%, the peak stress increased from 273 MPa to around 450 MPa, and the temperature variation amplitude increased. When the roll speed increased from 0.4 rad/s to 0.8 rad/s, the peak stress decreased from 45.1 MPa to around 31.7 MPa, and the temperature variation amplitude decreased. When the initial temperature decreased from 1 250 K to 1 150 K, the peak stress increased from 139 MPa to around 234 MPa, while the impact on the temperature field was not significant. In conclusion, grain variability is the fundamental reason for the significant differences in the distribution of micro-stress and temperature fields during the straightening process of stainless steel billets. Among them, the reduction ratio and roll speed have significant impacts on the stress and temperature fields, respectively, while the impact of initial temperature is relatively limited.

Key words

straightening machine / grain differentiation / Voronoi method model / stainless steel billet / thermal-mechanical coupling

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TONG Ze, HAN Xing, LI Chang, YU Anliang, WANG Ruhan. Mechanism of Microcrystalline Evolution Behavior during Straightening Process Based on Voronoi Method with Different Process Parameters[J]. Journal of Netshape Forming Engineering. 2026, 18(8): 242-254 https://doi.org/10.3969/j.issn.1674-6457.2026.08.022

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Funding

Open Project of Liaoning Provincial Key Laboratory of Metallurgical Equipment and Process Control (2024KFKT-01); Basic Scientific Research Special Fund of Liaoning Province for Universities (LJ222410146021)