EFFECT OF ORIENTATION ON CRYSTALLOGRAPHIC CRACKING IN NOTCHED NICKEL-BASE SUPERALLOY SINGLE-CRYSTAL SUBJECTED TO FAR-FIELD CYCLIC COMPRESSION

被引：21
|
作者：
ASWATH, PB [1 ]
机构：
[1] UNIV TEXAS, MAT SCI & ENGN PROGRAM, ARLINGTON, TX 76019 USA
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1994年 / 25卷 / 02期
关键词：
D O I：
10.1007/BF02647974
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of crystallographic orientation on the fatigue crack initiation and growth under far-field cyclic compression are discussed in single crystals of nickel-base superalloy MAR-M200. Results indicate that cracking occurs primarily due to planar slip on the {111}-type planes. Crystallographic cracking can occur on two or more slip planes simultaneously, but through-thickness cracks are not observed. In addition, it has been shown that the threshold stress intensity for crack initiation shows a strong dependence on orientation. The threshold stress intensity for crack growth in cyclic compression is 5 to 10 times the threshold for crack growth in cyclic tension.
引用
收藏
页码：287 / 297
页数：11
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