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RESEARCH PAPERS: Reliability, Stress Analysis, and Failure Prevention Papers

Evaluation of Creep-Fatigue Damage Interaction in HK40 Alloy

[+] Author and Article Information
S. Konosu, K. Maeda

Material Research Department, Research and Development Division, JGC Corp., Japan

T. Koshimizu

Gobo Power Station, Kansai Electric Power Co., Inc., Japan

T. Iijima

No. 2 Plant Engineering Department, Design Engineering Division, JGC Corp., Japan

J. Mech. Des 115(1), 41-46 (Mar 01, 1993) (6 pages) doi:10.1115/1.2919322 History: Received July 01, 1991; Online June 02, 2008

Abstract

In order to establish design criteria for materials which may sustain creep-fatigue damage, the creep rupture and creep-fatigue behavior of a high-carbon centrifugal cast steel was investigated at three different temperatures of 800, 900, and 1000°C, using HK-40 alloy which is a typical furnace tube material for fuel cell plant reformers and so on. The strain waveforms used for the creep-fatigue tests consisted of triangular waveforms—pp waves (fast-fast waves), cc waves (slow-slow waves), pc waves (fast-slow waves), and cp waves (slow-fast waves)—and a trapezoidal waveform holding the peak strain at the tension side. The applicability of various creep-fatigue interaction damage assessment methods were evaluated with particular emphasis on the life fraction rule (LFR) employed in ASME Section III, Boiler & Pressure Vessel Code Case N-47 and the strain range partitioning method (SRP). As it turned out that through the LFR life evaluation of HK-40 alloy subjected to strain cycling with holding at the tension side was well interpreted, design criteria for reformer tubes were established by applying the LFR to creep-fatigue life evaluation.

Copyright © 1993 by The American Society of Mechanical Engineers
Topics: Creep , Fatigue , Alloys
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