Research Papers: Materials and Fabrication

Assessment and Test of the Creep-Fatigue Crack Behavior for a High Temperature Component

[+] Author and Article Information
Hyeong-Yeon Lee1

 Korea Atomic Energy Research Institute, 150 Dukjin-dong, Yusong-gu, Daejeon 305-353, Koreahylee@kaeri.re.kr

Jae-Han Lee

 Korea Atomic Energy Research Institute, 150 Dukjin-dong, Yusong-gu, Daejeon 305-353, Korea

Kamran Nikbin

Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK


Corresponding author.

J. Pressure Vessel Technol 131(3), 031403 (Apr 07, 2009) (7 pages) doi:10.1115/1.3110024 History: Received March 16, 2008; Revised October 03, 2008; Published April 07, 2009

Creep-fatigue crack behavior has been investigated for a welded component with 316L stainless steel and Mod. 9Cr–1Mo steel through assessment and test. The evaluation of creep-fatigue crack initiation and propagation was carried out for 316L stainless steel according to the French RCC-MR A16 guide, and the evaluation of creep-fatigue crack initiation for a Mod.9Cr–1Mo steel specimen was carried out with an extended A16 method. A test for a structural specimen with a diameter of 500 mm, height of 440 mm, and thickness of 6.3 mm was performed to compare its results with that by an assessment according to the A16 guide. The specimen was subjected to creep-fatigue loads with 2 h of dwell time at 600°C and various primary loads. The creep-fatigue crack behaviors for the two materials were assessed, observed, and compared. The results showed that the A16 guide for the austenitic stainless steel was fairly conservative for the assessment of creep-fatigue crack initiation while it was reasonably conservative for creep-fatigue crack growth for the present specimen.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 5

3D half symmetric finite element model

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Figure 6

Finite element analysis results (t=5794 s)

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Figure 7

Creep-fatigue incubation envelope in the A16 guide

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Figure 8

The reference stress and reference strain

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Figure 9

Creep-fatigue crack growth for defect No. 1

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Figure 10

Observed images for the creep-fatigue initiation (a) 316L (after 50 cycles) and (b) Grade 91 (after 200 cycles)

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Figure 11

Observed images for defect No. 1 (316L) after 300 cycles

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Figure 12

Observed images for defect No. 2 (Grade 91) after 300 cycles

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Figure 13

Comparison of creep rupture strength for 316L stainless steel and Mod. 9Cr–1Mo steel

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Figure 14

Propagation of a surface defect by the test and the assessment

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Figure 1

A structure test specimen

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Figure 2

Observed locations of the specimen using a portable optical microscope

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Figure 3

Weld details for outer shell

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Figure 4

Thermal load conditions and the mechanical load at the top boundary of the specimen




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