-1) is significant. The recrystallization grain size decreases with the increase of strain rate under low strain rate, however, that increase with the increase of strain rate under high strain rate. The maximum extrusion force presented earlier decrease and later increase trend with the increase of extrusion rate. The 690 pipe were succeesfully extruded according to the experiment and FEM results."/>
The Effect of High Strain Rate on Hot Deformation Behavior and Extrusion Feasibility of 690 Alloy
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1.School of Materials Science and Engineering,University of Science and Technology Beijing;2.Zhejiang Jiuli Hi-tech Metals Co., Ltd.
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Abstract:
The effects of high strain rate on hot deformation behavior and extrusion feasibility were investigated by Gleeble thermal-simulation experiment and finite element method (FEM). The results show that the flow stress of 690 alloy is sensitive to the strain rate. The temperature rise in the alloy deformed with high strain rate (above 10 s-1) is significant. The recrystallization grain size decreases with the increase of strain rate under low strain rate, however, that increase with the increase of strain rate under high strain rate. The maximum extrusion force presented earlier decrease and later increase trend with the increase of extrusion rate. The 690 pipe were succeesfully extruded according to the experiment and FEM results.
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[Li Zhengzhou, Nai Qiliang, Wang Baoshun, Su Cheng, Dong Jianxin. The Effect of High Strain Rate on Hot Deformation Behavior and Extrusion Feasibility of 690 Alloy[J]. Rare Metal Materials and Engineering,2018,47(11):3372~3380.] DOI：[doi]