Characterization and Modelling of Microstructure Evolution and Flow Stress of Single-Phase Austenite and Ferrite Phases in Duplex Stainless Steels

Metals, vol. 15, pp. 130

Abstract

This paper presents an experimental and modeling study to investigate and predict the microstructure evolution for single-phase austenite and ferrite steels with the chemistry of the corresponding phases in a duplex stainless steel SUS329J4L under hot forming conditions. For steels with the compositions corresponding to both austenite and ferrite phases, single-pass hot uniaxial compression tests, stress relaxation tests, and heat treatment tests have been conducted for a temperature range of 1000–1250 °C and strain rates ranging from 0.3 to 30 s−1. The dynamic and static recrystallization mechanisms, as well as the grain growth behavior, were studied, and the material parameters of each mechanism were identified for a semi-empirical microstructure model called StrucSim. Double-compression tests in the same temperature and strain rate range were performed to validate the model, and a good correlation of the flow stress between the experiment and simulation was observed.

Authors 4

1. Holger Brüggemann corresponding Aachen Institute of Metal Forming

   RWTH Aachen University

   Affiliation as printed

   Institute of Metal Forming (IBF), RWTH Aachen University, Intzestr. 10, 52072 Aachen, Germany

2. Shunsuke Sasaki

   JFE Steel Corporation (Japan)

   Affiliation as printed

   Tubular Products & Casting Research Department, Steel Research Laboratory, JFE Steel Corporation, 1, Kawasaki-cho 1-chome, Handa 475-8611, Japan

3. Tatsuro Katsumura

   JFE Steel Corporation (Japan)

   Affiliation as printed

   Tubular Products & Casting Research Department, Steel Research Laboratory, JFE Steel Corporation, 1, Kawasaki-cho 1-chome, Handa 475-8611, Japan

4. David Benjamin Bailly Aachen Institute of Metal Forming

   RWTH Aachen University

   Affiliation as printed

   Institute of Metal Forming (IBF), RWTH Aachen University, Intzestr. 10, 52072 Aachen, Germany