The flow behavior modeling of as-extruded 3Cr20Ni10W2 austenitic heat-resistant alloy at elevated temperatures considering the effect of strain

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 17; no. 2; pp. 451 - 460
• Main Authors: Quan, Guo-Zheng, Mao, Yuan-Ping, Yu, Chun-Tang, Lv, Wen-Quan, Zhou, Jie
• Format: Journal Article
• Language: English
• Published: ABM, ABC, ABPol 01.04.2014; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: 3Cr20Ni10W2 austenitic heat-resistant alloy; Austenitic stainless steels; Constitutive equation; Constitutive equations; Constitutive relationships; Dynamic recrystallization; ENGINEERING, CHEMICAL; flow stress; Heat resistant alloys; material constants; MATERIALS SCIENCE, MULTIDISCIPLINARY; Mathematical models; METALLURGY & METALLURGICAL ENGINEERING; microstructure evolution; Strain; Strain rate; Yield strength; Constitutive equation; flow stress; microstructure evolution; material constants; 3Cr20Ni10W2 austenitic heat-resistant alloy
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/S1516-14392014005000016

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 super(-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, alpha , beta , 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, alpha , 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.