论文部分内容阅读
以汽车发动机气门Ti60合金铸件为研究对象,通过Gleeble-3800试验机下的等温压缩试验,研究了汽车发动机气门Ti60合金在960~1110℃和应变率0.001~10.0s~(-1)下的应力-应变特性,探究合金在高温下的变形特性。结果表明,合金的流变应力随应变率的增大而增大,而随温度的升高而减小;合金的α+β相区比于β相区,其流动软化现象更明显;在α+β相区,合金流动软化是由薄片状的α组织球化和组织的高温变形引起,而在β相区,流动软化是由动态回复和再结晶引起。
The Ti60 alloy valve with automotive engine valve was taken as the research object. Through the isothermal compression test under the Gleeble-3800 test machine, the stress of Ti60 alloy engine valve at 960 ~ 1110 ℃ and strain rate of 0.001 ~ 10.0s ~ (-1) - Strain characteristics to investigate the deformation characteristics of alloys at high temperature. The results show that the flow stress of the alloy increases with the increase of strain rate and decreases with the increase of temperature. The α + β phase of the alloy is more obvious than the β phase. The softening of α + β phase region, the softening of the alloy flow is caused by the lamellar α-structure spheroidization and the high-temperature deformation of the structure, whereas in the β-phase region, the flow softening is caused by the dynamic recovery and recrystallization.