The influence of a martensitic phase transformation on stress development in thermal barrier coating systems

被引：11

作者：

Glynn, ML ^{[1
]}

Chen, MW ^{[1
]}

Ramesh, KT ^{[1
]}

Hemker, KJ ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2004年 / 35A卷 / 08期

关键词：

D O I：

10.1007/s11661-006-0207-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermal barrier coatings (TBCs) provide thermal insulation and oxidation protection of Ni-base superalloys in elevated temperature turbine applications. Thermal barrier coating failure is caused by spallation, which is related to the development of internal stresses during thermal cycling. Recent microstructural observations have highlighted the occurrence of a martensitic bond coat transformation, and this finite-element analysis was conducted to clarify the influence of the martensite on the development of stresses and strains in the multilayered system during thermal cycling. Simulations incorporating the volume change associated with the transformation and experimentally measured coating properties indicate that out-of-plane top coat stresses are greatly influenced by the presence of the martensitic transformation, the temperature at which it occurs relative to the strength of the bond coat and attendant bond coat plasticity. Intermediate values of bond coat strength and transformation temperatures are shown to result in the highest top coat stresses.

引用

页码：2279 / 2286

页数：8

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