FATIGUE BEHAVIOR OF CMSX 2 SUPERALLOY [001] SINGLE-CRYSTALS AT HIGH-TEMPERATURE .1. LOW-CYCLE FATIGUE OF NOTCHED SPECIMENS

被引：31

作者：

DEFRESNE, A ^{[1
]}

REMY, L ^{[1
]}

机构：

[1] ECOLE MINES PARIS,CTR MAT PM FOURT,CNRS,URA 866,F-91003 EVRY,FRANCE

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1990年 / 129卷 / 01期

关键词：

D O I：

10.1016/0921-5093(90)90343-2

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The low cycle fatigue behaviour of shallow notch specimens of [001] superalloy single crystals was studied at 650 °C. Three notch orientations were used for CMSX 2 alloy and only one for MAR-M200 alloy. Crack initiation and growth were monitored using potential drop measurements and a plastic replication technique. A very large scatter in fatigue life was observed and no clear notch orientation dependence of fatigue life could be discerned. Cracks initiate at casting micropores in CMSX 2 and carbides in MAR-M200. These results are discussed using fractographic and metallographic observations. Emphasis is placed on microcrack growth and on the size and location of the initiating defect. © 1990.

引用

页码：45 / 53

页数：9

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