Abstract
In order to investigate the compressive deformation behavior of 3Cr20Ni10W2 alloy, a series of isothermal upsetting experiments were carried out in the temperature range of 1203-1403 K and strain rate range of 0.01-10 s-1 on a Gleeble-1500 thermo-mechanical simulator. The results indicate that the flow stress initially increases to a peak value and then decreases gradually to a steady state. The characteristics of the curves are determined by the interaction of work hardening (WH), dynamic recovery (DRV) and dynamic recrystallization (DRX). The flow stress decreases with increasing temperature and decreasing strain rate. The relationship between microstructure and processing parameters is discussed to give an insight into the hot deformation behavior of 3Cr20Ni10W2 alloy. Then, by regression analysis for constitutive equation, material constants (n, α, β, A and Q) were calculated for the peak stress. Further, the constitutive equation along the flow curve was developed by utilizing an eighth order polynomial of strain for variable coefficients (including n, α, A and Q). The validity of the developed constitutive equation incorporating the influence of strain was verified through comparing the experimental and predicted data by using standard statistical parameters such as correlation coefficient (R) and average absolute relative error (AARE) that are 0.995 and 4.08% respectively.
Highlights
In this regard, many constitutive equations have been proposed to describe the flow behavior of materials based on the experimental data
Heat-resistant Alloy at Elevated Temperatures Considering the Effect of Strain strain rate on the flow stress is significant for all the tested conditions
The flow stress increases at a declining rate as the softening from dynamic recovery (DRV) becomes higher than the work hardening rate
Summary
Many constitutive equations have been proposed to describe the flow behavior of materials based on the experimental data Among these equations, the Arrhenius type equation has been widely used to describe the elevated temperature flow behavior of materials[7,8,9,10,11]. The object is to characterize the general nature of the influence of strain, strain rate and temperature on the compressive flow behavior of 3Cr20Ni10W2 heat-resistant alloy. Toward this end, a series of hot compression tests were carried out at the temperatures of 1203 K, 1253 K, 1303 K, 1353 K and 1403 K, and the strain rates of 0.01 s–1, 0.1 s–1, 1 s–1 and 10 s–1. The experimental stress-strain data obtained from the compression tests were used to develop the hyperbolic sine constitutive equation describing the relationship of the flow stress, strain rate and temperature by considering
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