Study on a Constitutive Model for Predicting Hot Defor-mation Behavior of 34CrNi3MoA Steel for Reducer of Mining Equipment

X. F. Zhang, C. F. Huang

DOI: https://doi.org/10.64486/m.65.2.5
Online publication date: November 7, 2025

Abstract: As a high-strength medium-carbon quenched and tempered steel, 34CrNi3MoA is used in mining equipment reducer gears primarily due to its excellent mechanical properties, wear resistance, and impact resistance, meeting high-load demands under complex conditions. To develop an accurate constitutive model for predict-ing its high-temperature flow behavior, thermal compression tests were conducted on a Gleeble-3800 simulator at (1000–1200) °C and (0.01–10) s⁻¹ strain rates. A strain-compensated Arrhenius model was established using test data, with its predictability analyzed via correlation coefficient (R) and average absolute relative error (ARRE). Results show the model accurately predicts flow behavior under these conditions, with R = 0.9933 and ARRE = 5.244 %. These findings provide a reference for initial design and numerical prediction of 34CrNi3MoA’s high-temperature flow behavior, and are significant for numerical simulation and parameter optimization in its hot forming processes.

Keywords: 34CrNi3MoA steel; high-temperature flow behavior; constitutive model; reducer

This article is published online first and will appear in Metalurgija, Vol. 65, Issue 2 (2026).