Effect of electric current on recrystallization kinetics in interstitial free steel and AZ31 magnesium alloy

被引：106

作者：

Park, Ju-Won ^{[1
,2
]}

Jeong, Hye-Jin ^{[1
,2
]}

Jin, Sung-Woo ^{[1
,2
]}

Kim, Moon-Jo ^{[3
]}

Lee, Kyooyoung ^{[4
]}

Kim, Jae Joong ^{[5
]}

Hong, Sung-Tae ^{[6
]}

Han, Heung Nam ^{[1
,2
]}

机构：

[1] Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea

[2] Seoul Natl Univ, Res Inst Adv Mat, 1 Gwanak Ro, Seoul 08826, South Korea

[3] Korea Inst Ind Technol, Liquid Proc & Casting R&D Grp, 156 Gaetbeol Ro, Incheon 21999, South Korea

[4] POSCO, Tech Res Labs, 8 Pokposarang Gil, Gwangyang Si 57807, Jeollanam Do, South Korea

[5] POSCO, OSMAF Grp, 5 Haeryongsandart 2 Ro, Suncheon Si 58023, Jeollanam Do, South Korea

[6] Univ Ulsan, Sch Mech Engn, 93 Daehak Ro, Ulsan 44610, South Korea

来源：

MATERIALS CHARACTERIZATION | 2017年 / 133卷

基金：

新加坡国家研究基金会;

关键词：

Annealing; Recrystallization; Electropulsing treatment; Activation energy; Steel; Magnesium; MECHANICAL-BEHAVIOR; CURRENT PULSES; MICROSTRUCTURE; GROWTH;

D O I：

10.1016/j.matchar.2017.09.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of electric current on recrystallization kinetics in interstitial free (IF) steel and AZ31 magnesium alloy was investigated based on Vickers hardness measurements and microstructural observation. Electropulsing treatment (EPT) and furnace heat treatment (HT) for these work-hardened metals were carried out under various temperature and time conditions. The Vickers hardness value after EPT was clearly lower than that after HT at the same annealing condition in both IF steel and AZ31 alloy. The microstructural observation confirms that the reduced hardness value was caused by recrystallization. This implies that the recrystallization kinetics was accelerated by the athermal effect distinct from Joule heating. To identify the athermal effect of the electric current on the recrystallization kinetics, the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation was adopted. In both IF steel and AZ31 alloy, the value of the Avrami exponent, which depends on the nucleation rate in recrystallization, was higher in EPT than in HT. In addition, it was observed that the activation energy for recrystallization was reduced in EPT.

引用

页码：70 / 76

页数：7

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