Hot Ductility and Fracture Behavior of High‐Ti Weathering Steel

Abstract

The hot ductility behavior of high‐Ti weathering steel is studied by high‐temperature tensile testing in the temperature range of 650–1100 ºC. The results reveal a ductility trough in high‐Ti steel in the range of 650–962, 650–925, and 700–880 °C with minimum reduction in area (RA) of 22.21%, 36.53%, and 43.25% at 800 ºC and different strain rates of 1.0 × 10−3, 5.0 × 10−3, and 1.0 × 10−2 s−1, respectively. A number of secondary cracks containing S, N, and Ti propagate along the grain boundary, and the obvious preferred orientation is found in the microstructure near the fracture at 800 °C. With the increase in strain rate, the value of RA is increased in the temperature range of 650–1050 ºC, such that the probability of crack occurrence is decreased. RA does not increase with the increase in strain rate at 1100 °C and strain rate of 1.0 × 10−2 s−1. The underlying reason is that there is not adequate time for the material to recover or recrystallize with the increase in strain rate, resulting in material softening effect that is not completely reflected.

Study on Hot Flow Behaviors and Deformation/Diffusion Mechanisms of V and V–Ti Microalloyed Steels by Physical Constitutive Modeling

“…The Arrhenius model [10] and the Johnson-Cook (J-C) model [11] are two widely used phenomenological models, which have been successfully used to predict the flow behavior of a variety of materials. [12][13][14] However, these models are of little metallurgical significance and cannot reflect the evolution of microstructure. Therefore, different types of physical constitutive models have been proposed, including Zerilli-Armstrong (Z-A) model, [15] model based on dynamic recovery (DRV) and DRX mechanisms, [16,17] model based on dislocation mechanism, [18] and so on; these physical models are proposed with consideration of micromechanisms but have a large number of material constants.…”