Modeling of flow stress of 42CrMo steel under hot compression

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 499; no. 1; pp. 88 - 92
• Main Authors: Lin, Yong-Cheng, Chen, Ming-Song, Zhang, Jun
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier B.V 15.01.2009; Elsevier
• Subjects: 42CrMo steel; Applied sciences; Constitutive equation; Elasticity. Plasticity; Exact sciences and technology; Flow stress; Hot compression deformation; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Constitutive equation; 42CrMo steel; Hot compression deformation; Flow stress; Hot deformation; Plastic flow; Strain softening; Compression test; Modeling; Alloy steel; True stress true strain curve; Zener Hollomon parameter; Strain rate
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2007.11.119

The compressive deformation behavior of 42CrMo steel was investigated at temperatures from 850 °C to 1150 °C and strain rates from 0.01 s −1 to 50 s −1 on a Gleeble-1500 thermo-simulation machine. The results show that the true stress–true strain curves exhibit peak stresses at small strains, then the flow stresses decrease monotonically until high strains, showing a dynamic flow softening. The stress level decreases with increasing deformation temperature and decreasing strain rate, which can be represented by a Zener–Hollomon parameter in an exponent-type equation. A revised model describing the relationships of the flow stress, strain rate and temperature of the 42CrMo steel at elevated temperatures is proposed by compensation of strain. The stress–strain relations of 42CrMo steel predicted by the proposed models agree well with experimental results.