High Temperature Deformation Behavior of As-cast Ti45A18Nb2Mn0.2B Alloy
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摘要: Ti45Al8Nb2Mn0.2B铸造合金在900-1200℃温度范围,1-10-3/s应变速率条件下进行压缩实验,研究其变形特点以及组织变化.结果发现,形变过程中合金的真应力-真应变曲线上存在一个应力峰值,随后流变应力随着应变量的增加逐渐下降并趋于稳态流变.降低温度和提高应变速率都使合金的应力峰值增加.在实验温度范围内合金的应变速率敏感系数为0.10-0.24;在高温形变过程中发生动态再结晶,合金的组织得到明显细化.再结晶晶粒尺寸随温度的降低和应变速率的增加而减小,也就是随Zener-Hollomonc参数的增加而减小;升高形变温度和降低应变速率均促进再结晶过程.
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关键词:
- Ti45A18Nb2Mn0.2B /
- 高温形变 /
- 动态再结晶
Abstract: Compression tests were conducted with as-cast Ti45A18Nb2Mn0.2B alloy at strain rates of 1-10-3/ s at temperatures of 900-1200℃. Deformation processing and microstructure changes were analyzed. It is found that the strain-rate-sensitivity coefficients range from 0.10 to 0.24 at the test temperatures. The true stress-true strain curve shows a peak stress, then the flow stress decreases into a steady value with the increase in stain. Dynamic re-crystallization occurs in the alloy during the high-temperature deformation and considerable microstructure refinement is achieved. The recrystallized grain size decreases with the decreasing of compression temperature and the increasing of strain rate, that is, with the increase of Zener-Hollomon parameter. Recrystallization processing can be promoted with the increasing of temperature and the decreasing of strain rate.-
Keywords:
- Ti45A18Nb2Mn0.2B /
- high temperature deformation /
- microstructure
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