Abstract

The corrosion–fatigue fracture of an ultrafine-grained Ti–2.2Al–2.5Zr pseudo-α titanium alloy (PT-7M alloy), which is used in atomic power engineering, is studied. The formation of an ultrafine-grained structure by rotary forging is found to increase the corrosion–fatigue strength. The parameters in Basquin’s equation are determined, and the slope of the σ_a–log N fatigue curve is shown to nonmonotonically depend on the temperature of annealing of the ultrafine-grained alloy.

中文翻译：

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旋转锻造超细晶粒PT-7M钛合金的腐蚀疲劳断裂

摘要

研究了原子动力工程中使用的超细晶粒Ti–2.2Al–2.5Zr伪α钛合金（PT-7M合金）的腐蚀疲劳断裂。发现通过旋转锻造形成超细晶粒结构会增加腐蚀疲劳强度。在Basquin模型方程的参数被确定，和σ的斜率_一个-log  Ñ示出疲劳曲线nonmonotonically依赖于超细晶合金的退火的温度。