Effect of Quench Rate on Mechanical Properties and Microstructure of 6082 Al-alloy

doi:10.11901/1005.3093.2019.382

Chinese Journal of Materials Research

2020, Vol. 34

Issue (5): 337-344 DOI: 10.11901/1005.3093.2019.382

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Effect of Quench Rate on Mechanical Properties and Microstructure of 6082 Al-alloy

WANG Jing¹, XU Guofu¹^,², LI Yao¹, LI Fangfang¹, HUANG Jiwu¹^,², PENG Xiaoyan¹(

)

1.School of Materials Science and Engineering, Central South University, Changsha 410083, China
2.Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China

Cite this article:

WANG Jing, XU Guofu, LI Yao, LI Fangfang, HUANG Jiwu, PENG Xiaoyan. Effect of Quench Rate on Mechanical Properties and Microstructure of 6082 Al-alloy. Chinese Journal of Materials Research, 2020, 34(5): 337-344.

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Abstract

The quenching sensitivity of 6082 Al-alloy used in rail transit was investigated systematically by means of Jominy end-quench (JEQ) test, JMatpro7.0 simulation software, hardness test, tensile test and TEM. Results show that (1) The quenching sensitive temperature range is between 220~425℃. The nasal tip temperature for β'- and β''-phase is 375℃. According to the CCT curve, in order to suppress the precipitation of metastable β'- phase the cooling rate should be greater than 6℃/s during quenching process; (2) The hardness and strength decreased with the increase of the distance from the quenched end, and the depth of aging hardening layer is about 23 mm; (3) the quench-induced β-precipitates preferentially precipitated and grown on the heterogeneous nucleation site of α-(AlMnFeSi) phase, with the decrease of quenching cooling rate. During the subsequent aging process, the β-phase grows and absorbs the surrounding solute atoms, the strengthening precipitated β''-phase is reduced; (4) During the slow cooling process, the vacancy concentration near the grain boundaries decreases, and the precipitationfree precipitation zone (PFZ) at the grain boundaries widens.

Key words: metallic materials 6082 aluminum alloy Jominy end-quench mechanical properties microstructure

Received: 02 August 2019

ZTFLH:

TG146.2

Fund: Scientific Research Program of Guangdong Province(2016B090931004);Postdoctoral Science Foundation of Central South University(220363)

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	Jing WANG
	Guofu XU
	Yao LI
	Fangfang LI
	Jiwu HUANG
	Xiaoyan PENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.382 OR https://www.cjmr.org/EN/Y2020/V34/I5/337

Table 1 Chemical composition of the investigated 6082 aluminum alloy (mass fraction, %)

Fig.1 Jominy end-quench test schematic diagram (a) and the Jominy end-quench sample (b)

Fig.2 Simulation of 6082 alloy by JMatPro 7.0 software (a) TTT curve; (b) CCT curve

Fig.3 Cooling curve of jominy end-quench (a) and Av (b)

Fig.4 mechanical properties of as-aged JEQ bar (a) Hardness curve and hardness loss value; (b) Curve drawn by the tensile result at different positions

Fig.5 TEM structure observation of as-quenched 6082 alloy (a), (d) D=1 mm; (b) D=20 mm; (c), (e), (f) D=70 mm

Fig.6 TEM observation of as-aged 6082 alloy (a), (d) D=1 mm; (b), (d) D=20 mm; (c), (f) D=70 mm

Fig.7 TEM morphology of grain boundary of as-aged 6082 alloy (a) D=1 mm; (b) D=20 mm; (c) D=70 mm

Fig.8 TEM morphology in grain of as-aged 6082 alloy (a), (c) D=1 mm; (b), (d) D=70 mm

Fig.9 Relationship between hardness of alloy in aging state and quenching cooling rate

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