Temperature distribution for controlled-dwell extrusion of γ-TiAl |
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引用本文: | 刘冬,柏春光,崔玉友,杨锐.Temperature distribution for controlled-dwell extrusion of γ-TiAl[J].中南工业大学学报(英文版),2005,12(3):276-279. |
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作者姓名: | 刘冬 柏春光 崔玉友 杨锐 |
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作者单位: | InstituteofMetalResearch,ChineseAcademyofSciences,Shenyang110016,China |
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摘 要: | Ti-47Al-2Cr-2Nb-0.15B alloy (atom fraction) was extruded at temperatures(Ta) of 1250 and 1330℃,respectively. The method of adding a thermal insulating layer was used to overcome the problem associated with the flow stress mismatch between the can and the billet during extrusion. Effects of two kinds of insulations, ZrO2 powders and silica fibers, on the quality of extrude bar along the radial direction were studied, and the process parameters were optimized by combining with finite element method (FEM). Tensile properties of the extruded alloy at room and elevated temperature were tested. The results show that the silica fibers has better thermal insulating property than ZrO2 powders. The temperature distribution in radial is more homogeneous using silica fibers. The alloy has a good balance of yield strength and room temperature ductility and the values are 680 MPa and 3.5%, respectively.
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关 键 词: | TiAl合金 可控挤压 温度梯度 性能 |
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