Small crack behavior and fracture of nickel-based superalloy under ultrasonic fatigue

被引：44

作者：

Chen, Q

Kawagoishi, N

Wang, QY

Yan, N

Ono, T

Hashiguchi, G

机构：

[1] Kochi Natl Coll Technol, Dept Engn Mech, Nankoku, Kochi 7838508, Japan

[2] Kagoshima Univ, Fac Engn, Dept Mech Engn, Kagoshima 8900065, Japan

[3] Sichuan Univ, Dept Civil Engn & Mech, Chengdu 610065, Peoples R China

[4] Tohoku Univ, Dept Nanomech, Div Mech Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan

[5] Kagawa Univ, Fac Engn, Dept Intelligent Mech Syst Engn, Takamatsu, Kagawa 7610396, Japan

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2005年 / 27卷 / 10-12期

关键词：

ultrasonic; fatigue; nickel-based superalloy; small crack; high cycle; HIGH-CYCLE FATIGUE; PROPAGATION BEHAVIOR; INCONEL; 718; ELEVATED-TEMPERATURES; GROWTH; FREQUENCY; STRENGTH; INITIATION; ROOM;

D O I：

10.1016/j.ijfatigue.2005.07.022

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fracture and small crack behavior in the very high cycle domain of 109 cycles were investigated with a nickel-based superalloy under ultrasonic fatigue in ambient air at room temperature. The influence of ultrasonic frequency is examined by comparing the results with those C in conventional low frequency fatigue. It is found that fatigue strength increases as frequency is raised up to 19.5 kHz and the most of fatigue life is consumed in nucleating and propagating small cracks up to 100 mu m. Transition of fracture mode from transgranular ductile fracture to cleavage-dominated fracture occurs beyond a critical stress intensity factor range of approximately 21 MPa root m, leading to the catastrophic failure under ultrasonic fatigue. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1227 / 1232

页数：6

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