Effect of prior oxidation on high cycle fatigue performance of RR1000 and role of oxidation in fatigue crack initiation

被引：9

作者：

Cruchley, S. ^{[1
]}

Taylor, M. P. ^{[1
]}

Li, H. Y. ^{[1
]}

Evans, H. E. ^{[1
]}

Bowen, P. ^{[1
]}

Child, D. J. ^{[2
]}

Hardy, M. C. ^{[2
]}

机构：

[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

[2] Rolls Royce PLC, Derby DE24 8BJ, England

来源：

MATERIALS AT HIGH TEMPERATURES | 2015年 / 32卷 / 1-2期

基金：

英国工程与自然科学研究理事会;

关键词：

Oxidation; Fatigue crack initiation; High cycle fatigue; GRAIN-BOUNDARY OXIDATION; NI-BASED SUPERALLOY; MECHANISM; ALLOY; BEHAVIOR; KINETICS; GROWTH; DAMAGE; TIP;

D O I：

10.1179/0960340914Z.00000000064

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of prior oxidation on the room temperature fatigue life of coarse grained Ni based superalloy, RR1000 has been performed at an R ratio of 0.1 with two pre-oxidation times: 100 and 2000 h at 700 degrees C. These pre-exposures produce extensive oxidation damage. The room temperature high cycle fatigue life of the pre-oxidised specimens has been compared to as received specimens. At a maximum applied stress of 800 MPa a significant fatigue life deficit is observed in the pre-oxidised testpieces. This is accompanied with the observations of significant cracking of the external chromia scale and the intergranular internal oxides within the area of maximum stress. Preferential cracking of oxides may lead to early crack initiation and consequently a reduction in total fatigue life.

引用

页码：68 / 73

页数：6

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