Effects of the Quenching Rate on the Microstructure, Mechanical Properties and Paint Bake-Hardening Response of Al–Mg–Si Automotive Sheets

Gao, Guanjun; Li, Yong; Wang, Zhaodong; Di, Hongshuang; Li, Jiadong; Xu, Guangming

doi:10.3390/ma12213587

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Effects of the Quenching Rate on the Microstructure, Mechanical Properties and Paint Bake-Hardening Response of Al–Mg–Si Automotive Sheets

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State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

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Materials 2019, 12(21), 3587; https://doi.org/10.3390/ma12213587

Received: 20 September 2019 / Revised: 22 October 2019 / Accepted: 28 October 2019 / Published: 31 October 2019

(This article belongs to the Collection Additive Manufacturing: Alloy Design and Process Innovations)

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Abstract

The quenching rate of Al–Mg–Si alloys during solution treatment is an important parameter for the automotive industry. In this work, the effect of the different quenching rates on the microstructures, mechanical properties, and paint bake-hardening response of Al–Mg–Si sheets was studied. Large dimples form on the fracture surface of a sample at a quenching rate of 0.01 °C/s. When the quenching rate increased to 58.9 °C/s, the dimples became smaller. The recrystallized grains and textures were slightly affected by quenching rates beyond 1.9 °C/s. Thus, higher r values of the samples were achieved with slower quenching rates. Furthermore, only the Al(FeMn)SiCr insoluble phases were observed in samples with a rapid quenching rate. Sufficient solute atoms and vacancies resulted in the improvement of the precipitation kinetics and paint bake-hardening capacity for Al–Mg–Si sheets at rapid rates. With a decrease in the quenching rate, the formation of the rod-like coarse β′ phases consumed many solute atoms and vacancies, leading to the deterioration of the paint bake-hardening capacity. This study provides a critical reference on quenching rates for industrial practices, so that good mechanical properties can be achieved using precision control of the quenching process. View Full-Text

Keywords: Al–Mg–Si alloy; quenching rate; microstructures; mechanical properties; paint bake-hardening; precipitates

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MDPI and ACS Style

Gao, G.; Li, Y.; Wang, Z.; Di, H.; Li, J.; Xu, G. Effects of the Quenching Rate on the Microstructure, Mechanical Properties and Paint Bake-Hardening Response of Al–Mg–Si Automotive Sheets. Materials 2019, 12, 3587. https://doi.org/10.3390/ma12213587

AMA Style

Gao G, Li Y, Wang Z, Di H, Li J, Xu G. Effects of the Quenching Rate on the Microstructure, Mechanical Properties and Paint Bake-Hardening Response of Al–Mg–Si Automotive Sheets. Materials. 2019; 12(21):3587. https://doi.org/10.3390/ma12213587

Chicago/Turabian Style

Gao, Guanjun, Yong Li, Zhaodong Wang, Hongshuang Di, Jiadong Li, and Guangming Xu. 2019. "Effects of the Quenching Rate on the Microstructure, Mechanical Properties and Paint Bake-Hardening Response of Al–Mg–Si Automotive Sheets" Materials 12, no. 21: 3587. https://doi.org/10.3390/ma12213587

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