The thin-wall debit of a typical cast polycrystalline M951 alloy
The thin-wall debit of a typical cast polycrystalline M951 alloy作者机构：Shi-Changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2022年第32卷第1期
页 面：104-113页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：financially supported by the National Natural Science Foundation of China (No.51971214, No.51771191, No.51701212) National Science and Technology Major Project (J2019-VI-0018-0133) Liaoning Provincial Natural Science Foundation of China (No.2019-MS336)
主 题：M951 Thin-wall debit Surface crack Through-grain boundary
摘 要：The effect of specimen thickness on the rupture properties of cast Ni-based polycrystal superalloy M951 was investigated in this paper. The results of the rupture tests in air under 980°C/90 MPa revealed that the rupture life and elongation obviously decreased with decreasing specimen thickness. The thin-wall effect for polycrystal superalloy M951 is associated with several factors. First, the surface oxidation and internal nitridation induce the reduction in the load-bearing section, which accelerates the rupture fracture of thin specimens. Second, the combined effect of oxidation and stress at the surface grain boundary facilitates the premature initiation and propagation of the surface cracks in thin specimen. Third, the through-grain boundaries introduce by specimens machining are detrimental for rupture property. A direct comparison of rupture properties of thin-wall samples with different grain morphologies indicate that thin-wall effect can be diminished by avoiding through-grain boundary introduction.
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