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中文摘要: 为研究具有原始粗片层组织的Ti5321合金热压缩变形过程中流变应力、显微组织等随变形条件的变化，在Gleeble-2800型热模拟试验机上进行高温热压缩试验，试验温度790~850 ℃，应变速率为0.01~1 s-1，变形量为30%~70%。结果表明：Ti5321合金的软化机制与片层组织球化和动态再结晶有关，变形量和变形温度是影响合金片层组织球化及β再结晶的主要因素。同一变形温度和应变速率下，随着变形量的增大.会出现片层α相球化及β相再结晶现象。当应变速率和变形量相同时，低温变形主要发生的是片层α相球化行为，高温变形发生的是β相的再结晶。
Abstract:In order to study the change of flow stress and microstructure of Ti5321 alloy with original coarse lamellar microstructure，the hot compressive deformation behavior was investigated using Gleeble 2800 system thermal simulator machine. The test conditions were set as follows, the temperature range of 790~850 ℃, the strain rate range of 0.01~1 s-1 and the deformation range of 30%~70%. The results show that the softening mechanism of Ti5321 alloy is related to the spheroidization and dynamic recrystallization of the lamellar alpha. The deformation amountand temperatureare the main factors to influence the spheroidization behavior of lamellar alpha and dynamic recrystallization of beta phase. When the deformation temperature and strain rate are the same, the spheroidization behavior of lamellar alpha and dynamic recrystallization of beta phase occur with the increasing of the deformation amount. When the strain rate and deformation amount are the same, lamellar alpha spheroidizing behaviors mainly occur at the low temperature deformation, but recrystallization of beta phase is happened at high temperature deformation.
keywords: titanium alloy lamellar microstructure deformation behavior spheroidization recrystallization
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