Simultaneously Improving Mechanical Properties and Stress Corrosion Cracking Resistance of High-Strength Low-Alloy Steel
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Simultaneously Improving Mechanical Properties and Stress Corrosion Cracking Resistance of High‑Strength Low‑Alloy Steel via Finish Rolling within Non‑recrystallization Temperature Hongchi Ma1,2 · Baijie Zhao2 · Yi Fan2 · Kui Xiao1,3 · Jinbin Zhao2 · Xuequn Cheng1 · Xiaogang Li1 Received: 12 April 2020 / Revised: 19 July 2020 / Accepted: 9 August 2020 © The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effect of hot rolling process on microstructure evolution, mechanical properties and stress corrosion cracking (SCC) resistance of high-strength low-alloy (HSLA) steels was investigated by varying the finish rolling temperature (FRT) and total rolling reduction. The results revealed granular bainite with large equiaxed grains was obtained by a total rolling reduction of 60% with the FRT of 950 °C (within recrystallization temperature Tr). The larger grain size and much less grain boundaries should account for the relatively lower strength and SCC resistance. A larger rolling reduction of 80% under the same FRT resulted in the formation of massive martensite–austenite (M/A) constituents and resultant low ductility and SCC resistance. In contrast, a good combination of strength, ductility and SCC resistance was obtained via 80% rolling reduction with the FRT of 860 °C (within non-recrystallization temperature Tnr), probably because of the fine grain size and M/A constituents, as well as a high density of grain boundary network. Keywords High-strength low-alloy (HSLA) steel · Finish rolling temperature · Non-recrystallization temperature · Stress corrosion cracking (SCC) · Grain boundary character · Martensite–austenite (m/a) constituents
1 Introduction High-strength low-alloy (HSLA) steels have been widely used in ocean engineering structures such as vessels, bridges and offshore platforms, because of their excellent mechanical properties, formability and weldability [1, 2]. As these structures are usually exposed in corrosive environment for a long time and bear great loading, they are supposed to require a good combination of strength-toughness and
Available online at http://link.springer.com/journal/40195. * Xuequn Cheng [email protected] 1
Key Laboratory for Corrosion and Protection (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Jiangsu Key Laboratory for Premium Steel Materials, Nanjing Iron & Steel United Co., Ltd., Nanjing 210035, China
3
State Key Laboratory of Metal Material for Marine Equipment and Application, Ansteel, Anshan 114021, China
corrosion resistance, especially stress corrosion cracking (SCC) resistance [3–6]. Given that HSLA steels are generally produced through microalloying and thermochemical controlled processing [7, 8], hot rolling processing parameters, especially finish rolling temperature (FRT) and accumulative rolling reduction, usually have a notable influence on the final microstructure and mechanical properties (streng
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