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| SIMULATION AND OPTIMIZATION OF THERMAL FIELD DURING CONTINUOUS CONSTRAINED RHEO-ROLLING OF AZ31 ALLOY |
| GUAN Renguo, ZHANG Qiusheng, DAI Chunguang, ZHAO Zhanyong, LIU Chunming |
| College of Materials and Metallurgy, Northeastern University, Shenyang 110819 |
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Cite this article:
GUAN Renguo ZHANG Qiusheng DAI Chunguang ZHAO Zhanyong LIU Chunming. SIMULATION AND OPTIMIZATION OF THERMAL FIELD DURING CONTINUOUS CONSTRAINED RHEO-ROLLING OF AZ31 ALLOY. Acta Metall Sin, 2011, 47(9): 1167-1173.
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Abstract Semisolid metal processing (SSP) is recognized as a new near-shape forming technology, which combines the merits of both the liquid and the solid metal processing. Compared with the traditional rolling process, this technology has the features of low energy consumption, low cost equipment and high yield. Perhaps inevitably, a problem is the solid and liquid phases tend to separate with each other during rheo-rolling process, especially when the semisolid slurry has a low solid fraction. This problem causes macrosegregation and reduces the quality of the strip. Using rectangular groove roller may solve this problem. In this paper, numerical simulation method and experiment were combined for simulation and optimization of thermal field during continuous constrained rheo-rolling of AZ31 alloy. The results show that on the sloping plate surface, alloy temperature decreases gradually from the casting mouth to the exit with a linear pattern, the alloy temperature near the sloping plate surface is lower than that on the above surface, when the casting temperature is higher than 690℃, the melt temperature at the exit of the plate is higher than the liquidus of AZ31 alloy, which will cause product fracture. In the backward slip zone, semisolid metal deformation mainly happens, alloy temperature decreases gradually from the entrance to the exit of the roll gap, semisolid zone length increases with the casting temperature, isothermal lines have twice buckling, the buckling direction on the surface of the alloy is toward the exit of the roll gap, while the buckling direction in the center is toward the entrance of the roll gap, and their bending degree increases gradually from neutral flow plane to the entrance of the roll gap. In the forward slip zone, solid metal deformation mainly takes place, isothermal lines have once buckling, and the buckling direction is toward the exit of the gap. Under the current experimental conditions, the proper casting temperature between 670 and 690℃ is suggested.
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Received: 27 April 2011
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| Fund: Supported by National Natural Science Foundation of China (Nos.50974038 and 51034002) and National Basic Research Program of China (No.2011CB610405) |
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