MICROSTRUCTURES INDUCED BY A STRESS GRADIENT IN A NICKEL-BASED SUPERALLOY

被引：47
|
作者：
IGNAT, M
BUFFIERE, JY
CHAIX, JM
机构：
[1] Laboratoire de Thermodynamique et Physico-Chimie Métellurgiques, ENSEEG, 28402 St Martin d'Hères
来源：
ACTA METALLURGICA ET MATERIALIA | 1993年 / 41卷 / 03期
关键词：
D O I：
10.1016/0956-7151(93)90019-O
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The evolution of the microstructure of single crystals of a nickel-based superalloy during high temperature (1323 K, 1050-degrees-C) creep in bending has been studied. Bending provides both tensile and compressive stress gradients; consequently the effects of varying stress conditions on the evolution of the morphology of the gamma' precipitates can be determined from a single specimen. The morphological changes were analysed by scanning electron microscopy using image analysis techniques and by transmission electron microscopy, then described by dimensionless parameters. We discuss the dependence of the morphological changes in the superalloy on the stresses acting in the sample (magnitude and sign). We also discuss the driving mechanisms for the observed morphological changes.
引用
收藏
页码：855 / 862
页数：8
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