Mechanism for oxygen enhanced crack growth in Inconel 718

被引：45
|
作者：
Miller, CF [1 ]
Simmons, GW
Wei, RP
机构：
[1] Lehigh Univ, Dept Chem Engn, Zettlemoyer Ctr Surface Studies, Bethlehem, PA 18015 USA
[2] Lehigh Univ, Dept Mech Engn & Mech, Zettlemoyer Ctr Surface Studies, Bethlehem, PA 18015 USA
来源：
SCRIPTA MATERIALIA | 2001年 / 44卷 / 10期
基金：
美国国家科学基金会;
关键词：
oxygen enhanced crack growth; X-ray photoelectron spectroscopy (XPS) niobium; crack growth mechanism; Ni base alloy;
D O I：
10.1016/S1359-6462(01)00933-2
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The preferential oxidation of Nb and Cr on heated, polished surfaces of Inconel 718 and the penetration of oxygen ahead of the crack tip (∼150 μ), leading to enrichment and oxidation of Nb and Cr were studied. The more reactive Nb was believed to play a significant role in the intergranular failure of Inconel 718, but the observed Cr enrichment and oxidation ahead of the crack tip cannot be ruled out. The limited reactivity of Ni and Fe at the crack tip is, however, not consistent with crack growth enhancement mechanisms involving Ni and Fe oxidation. The role of Cr in the series of Ni-based superalloys interrupted crack growth mechanisms was investigated.
引用
收藏
页码：2405 / 2410
页数：6
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