AN INVESTIGATION OF THE CREEP-FATIGUE-ENVIRONMENT INTERACTION IN A NI-BASE SUPER-ALLOY

被引：27

作者：

FLOREEN, S

KANE, RH

机构：

[1] Inco Research and Development Center, Suffern, New York, 10901, Sterling Forest

来源：

FATIGUE OF ENGINEERING MATERIALS AND STRUCTURES | 1979年 / 2卷 / 04期

关键词：

D O I：

10.1111/j.1460-2695.1979.tb01097.x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Abstract— This work was conducted to study the significant increases in fatigue crack growth rates at low frequencies commonly observed at high temperature. Creep tests and fatigue tests at 0·01, 0·1 and 1·0 Hz were conducted at 650°C in air and in helium on samples of INCONEL alloy 718 in two different heat treatments. Creep crack growth rates were 50–100 times greater in air than in helium. Fatigue tests in helium showed little sensitivity to frequency, but tests in air showed considerable increases in crack growth rates at lower frequencies. The results indicate the air environment played a predominant role in both the creep and the fatigue tests. Oxygen diffusion into grain boundaries appeared responsible for the accelerated crack growth in air. An overaging heat treatment reduced the crack growth rates. Copyright © 1979, Wiley Blackwell. All rights reserved

引用

页码：401 / 412

页数：12

共 13 条

[1]

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[2]

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[10]

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