THERMOMECHANICAL STUDY ON 42CRMO4 STEEL FORMABILITY
To better understand the tensile deformation and fracture behavior of 42CrMo4 steel during hot processing, uniaxial tensile tests at elevated temperatures and different strain rates were performed. The behavior of 42CrMo4 steel was studied by hot tensile tests with the deformation temperature range of 700 – 1000 °C and strain rate range of 0.006 - 0.1 s-1. Effects of deformation condition on the flow behavior, microstructure evolution and fracture characteristic were analyzed. The results indicated that the flow stress was sensitive to the deformation condition. Scanning electron microscope (SEM) images showing both the fracture surfaces and the matrix near the fracture section indicated the ductile nature of the material. However, the fracture mechanisms varied according to the deformation condition, which influences the dynamic recrystallization (DRX) condition.
Key words: hot tensile test, tensile strength, strain rate, ductile fracture, SEM.
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