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Vol.46, No.4, 189 ~ 199, 2008
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| Title |
| Effect of Rolling Conditions on Microstructure and Mechanical Properties of HCC AZ31 Alloy Plate |
| 김영민 Young Min Kim , 천은영 Eun Young Chun , 임창동 Chang Dong Yim , 유봉선 Bong Sun You , 이재현 Je Hyun Lee |
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| Abstract |
| The changes in microstructure and mechanical properties of AZ31 alloy subjected hot-rolling process were investigated. The AZ31 plates fabricated by horizontal continuous casting process were prepared and have hot-rolled from 30 mm to 1 mm in thickness under different processing conditions. At the rolling temperature of 400℃, little surface and side crack was observed up to 20% reduction rate. As total reduction and reduction rate increase to more than 75% and 20% pass, respectively, Grains were more uniformly refined through overall thickness, and particularly lots of shear bands were appeared to be inclined at less than 20° along the rolling direction. Average grain size of less than 5 μm and tensile properties of YS ≥ 250 MPa, UTS ≥ 300 MPa and El. ≥ 13% were acquired for hot-rolled AZ31 sheets without post-heat treatment. Maximum intensity of (0002) pole figure was decreased with an increase in reduction rate, indicating the improvement of texture by means of high reduction rate. |
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| Key Words |
| magnesium alloys, hot-rolling, horizontal continuous casting, microstructure, texture |
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