Influence of an aluminide coating on the TMF life of a single crystal nickel-base superalloy

被引：9

作者：

Affeldt, EE ^{[1
]}

机构：

[1] MTU Motoren & Turbinen Union Munchen, D-80976 Munich, Germany

来源：

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME | 1999年 / 121卷 / 04期

关键词：

D O I：

10.1115/1.2818527

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

TMF tests were conducted with bare and aluminide coated single crystal nickel-based superalloy specimens. Temperature cycling was between 400 degrees C and 1100 degrees C with a phase shift (135 deg) that is typical for damaged locations on turbine blades. Stress response is characterized by a constant range and the formation of a tensile mean stress as a result of relaxation in the high temperature part of the cycle which is in compression. Bare specimens showed crack initiation from typical oxide hillocks. Coated specimens showed life reduction with respect to the bare ones caused by brittle cracking of the coating in the low temperature part of the cycle. Isothermal bending tests of coated specimens confirmed the low ductility of the coating at temperatures below 600 degrees C but quantitative correlation with the TMF test results failed.

引用

页码：687 / 690

页数：4

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