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Effect of a Large Population of Seeded Alumina Inclusions on Crack Initiation and Small Crack Fatigue Crack Growth in Udimet 720 Nickel-Base Disk Superalloy
International Journal of Fatigue ( IF 6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ijfatigue.2020.105953
J. Telesman , T.P. Gabb , P.T. Kantzos , P.J. Bonacuse , R.L. Barrie , C.A. Kantzos

Abstract Crack initiation, crack coalescence and small crack growth behavior were monitored for over 400 seeded inclusions during interrupted low cycle fatigue testing conducted on the P/M Udimet 720 nickel disk alloy at 650 °C. Two types of seeded alumina inclusions with average sizes of 54 µm and 122 µm were used in the study performed at varying loading conditions resulting in LCF lives ranging from 2,000 cycles to over 1,000,000 cycles. The fatigue behavior was sub-categorized into four groups. Visual maps detailing inclusion size/cycle history were developed. The effect of surface residual stresses on the fatigue life was also investigated.

中文翻译:

大量晶种氧化铝夹杂物对 Udimet 720 镍基圆盘高温合金中裂纹萌生和小裂纹疲劳裂纹扩展的影响

摘要 在 650 °C 下对 P/M Udimet 720 镍圆盘合金进行间断低周疲劳试验期间,监测了 400 多个晶种夹杂物的裂纹萌生、裂纹合并和小裂纹扩展行为。在不同负载条件下进行的研究中使用了平均尺寸为 54 µm 和 122 µm 的两种类型的晶种氧化铝夹杂物,导致 LCF 寿命从 2,000 次循环到超过 1,000,000 次循环。疲劳行为被细分为四组。开发了详细说明内含物大小/循环历史的可视化地图。还研究了表面残余应力对疲劳寿命的影响。
更新日期:2021-01-01
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