摘要
对体育器材用Ti60合金铸件进行等温压缩试验,研究了该合金在960~1110℃和应变率0.001~10.0 s^(-1)下的材料特性。以双曲正弦模型为基础构建了合金的热变形本构方程,分析了该合金在高温下的塑性。对比观察实验前后合金的微观组织。结果表明,α+β相区和β相区的表观活化能分别为648、179 k J/mol,原因是α+β相区片状α组织的动态球化作用更剧烈;流动应力与变形温度和应变率有关;应变为0.6时,流动应力随应变率的增大而增大;在应变率一定时,变形温度越高,流动应力越小。
The isothermal compressions expriment of Ti60 alloy casting used in sportse quipment were carried out. Then, the material characteristics of the alloy at 960-1110℃ and strain rate of 0.001-10.0 s-1 were studied. The hot deformation constitutive equation was built based on hyperbolic sine model. The plastic behavior of Ti60 alloy at high temperature was analyzed. The microstructure of the alloy before and after experiment was observed. The results indicate that the apparent activation energy of Ti60 alloy is determined robe 648 kJ/mol and 179 kJ/mol for two-phaseα＋β field and single-phase βfield, respectively, it is because of the fiercer dynamic globularization of lamella α phase in α＋βregion. The deformation temperature and strain rate have a relatioinship with flow stress.When the stain is 0.6, the flow stress increases with the stain rate increasing. Meanwhile, the flow stress decreases with the deformation temperature increasing, when strain rate is fixed.
出处
《热加工工艺》
CSCD
北大核心
2016年第2期84-86,共3页
Hot Working Technology
关键词
体育器材
Ti60合金
高温
塑性
微观组织
sports equipment
Ti60 alloy
high temperature
plastic behavior
microstructure
