Preprint Article Version 1 This version is not peer-reviewed

The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallised Austenite Grains of HSLA Steel

Version 1 : Received: 5 July 2019 / Approved: 8 July 2019 / Online: 8 July 2019 (04:05:10 CEST)

How to cite: Gnapowski, S.; Kalinowska- Ozgowicz, E.; Sniadkowski, M.; Pietraszek, A. The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallised Austenite Grains of HSLA Steel. Preprints 2019, 2019070096 (doi: 10.20944/preprints201907.0096.v1). Gnapowski, S.; Kalinowska- Ozgowicz, E.; Sniadkowski, M.; Pietraszek, A. The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallised Austenite Grains of HSLA Steel. Preprints 2019, 2019070096 (doi: 10.20944/preprints201907.0096.v1).

Abstract

This paper presents the results of investigations of the effects of hot deformation parameters in compression investigation on the austenite grain size in HSLA steel (0.16% C, 0.037% Nb, 0.004% Ti, 0.0098% N). The axisymmetric compression investigations were performed on cylindrical investigation specimens of d=1.2 using the Gleeble 3800 simulator. The strain rate=1s-1÷15.9s-1 and strain degree ε=1.2. Before deformation, the research specimens were austenitized at TA = 1100 ÷ 1250 °C. Metallographic observations of the primary austenite grains were conducted with an optical microscope, while the structure of dynamically recrystallized austenite, inherited by martensite, was examined by EBSD technique using a scanning electron microscope. Based on the analysis of investigation results, it was found that the size of dynamically recrystallized austenite grains in HSLA steel were clearly affected by hot compression parameters. In contrast, no significant impact of austenitising temperature on their size was found.

Subject Areas

HSLA steel; dynamic recrystallization; austenite grain; plastic strain; Gleeble simulator

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