不同疲劳热环境下GH4169高温合金形变行为研究  

Study on Deformation Behaviors of GH4169 High Temperature Alloy Under Different Fatigue Thermal Environment

作　　者：琚子来[1] 黄曼曼[1] 

机构地区：[1]唐山工业职业技术学院机械工程系,河北唐山063020

出　　处：《铸造技术》2017年第6期1308-1309,共2页Foundry Technology

摘　　要：以镍基高温合金GH4169为对象,研究了600℃时不同取向的3种镍基单晶合金在不同低周疲劳下的循环变形行为,采用计算机软件对试验数据进行拟合分析。结果表明,3种取向[001]、[011]和[111]的镍基单晶合金,在不同总应变幅下的硬化曲线均在高总应变幅时表现为循环硬化,在低总应变幅时为循环稳定的特征;[001]取向的合金在0.6%总应变幅下的应力-应变为线性关系,显示出弹性变形的特点;在0.85%总应变幅下发生塑性变形;当总应变幅增加到1%时,可以观察到合金中位错缠结,且位错密度明显增大。Taking GH4169 high temperature alloy as research object, the deformation properties of the nickel single crystal alloy at 600℃ in three different orientations were studied, and the data was fitted by a computer soRware. The results show that the nickel single crystal superaUoy with [001], [011] and [111] orientation shows the cycling hardening behavior under different high strain and low strain, and the stable cycling characterization. Under 0.6% total strain, the nickel alloy with [001] orientation shows a linear stress-strain relationship and an elastic deformation behavior; under 0.85% total strain, the alloy shows a plastic deformation; when the total strain reach 1%, a dislocation tangling can be observed with increasing dislocation density.

关 键 词：GH4169高温合金 低周疲劳 计算机拟合 

分 类 号：TG132.3[一般工业技术—材料科学与工程]