Precipitation and Flow Behavior of AISI 630 Stainless Steel Deformed at Elevated Temperatures
Journal article, 2023

Hot compression tests were performed on the samples of AISI 630 stainless steel in the temperature range of 900-1050 degrees C and at strain rates of 10(-3)- 1 s(-1). Single peak stress flow behavior was observed at all deformation conditions. An irregular relationship was found between the peak point of flow curves and processing condition, i.e., temperature and strain rate. The stress relaxation tests at the temperature range of 900-1050 degrees C revealed that dynamic precipitation (DP) of carbides in the matrix and grain boundaries causes the considered irregularities in the peak stress. The FE-SEM studies also showed that DP of carbides could be responsible for the retardation of dynamic recrystallization (DRX). The phase extraction by residual testing ascertained that fine niobium carbides are the major sources for the effect of DP on the microstructural mechanisms. EBSD and optical microscopy confirmed the occurrence of continuous dynamic recrystallization by the progressive evolution of substructure toward the formation of new small grains. The enhancing rotated (cube) or slight weakening of copper and brass/ Goss texture components were mainly associated with the DRX. The hyperbolic sine equation is used in calculating the activation energy at strain of 0.4 as 485.6 kJ/mol.

hot deformation

stress relaxation

dynamic recrystallization

constitutive analysis

AISI 630

dynamic precipitation

Author

Z. Sangarimotlagh

Hamedan University of Technology

B. Tolaminejad

Hamedan University of Technology

A. Momeni

Hamedan University of Technology

Irina Fedorova

Chalmers, Physics, Microstructure Physics

I. S. Zuiko

Belgorod State University

R. Kaibyshev

Belgorod State University

Journal of Materials Engineering and Performance

1059-9495 (ISSN) 1544-1024 (eISSN)

Vol. 32 8 3690-3702

Subject Categories

Applied Mechanics

Other Materials Engineering

Metallurgy and Metallic Materials

DOI

10.1007/s11665-022-07340-z

More information

Latest update

7/7/2023 5