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Research Papers

Characterization of Structural Embrittlement of Creep Crack Growth for W-Added 12%Cr Ferritic Heat-Resistant Steel Related to the Multiaxial Stress

[+] Author and Article Information
Ryuji Sugiura

Graduate School of Engineering, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japansugiura@md.mech.tohoku.ac.jp

A. Toshimitsu Yokobori

Graduate School of Engineering, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan

Masaaki Tabuchi

 National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan

Akio Fuji

Department of Metallurgy, Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd., 3-1-15 Toyosu, Koto, Tokyo 135-0061, Japan

Takeshi Adachi

Faculty of Science and Engineering, Ishinomaki Senshu University, Shinmito, Minanisakai, Ishinomaki 986-8580, Japan

J. Eng. Mater. Technol 131(1), 011004 (Dec 17, 2008) (9 pages) doi:10.1115/1.3026544 History: Received October 25, 2007; Revised August 28, 2008; Published December 17, 2008

In components under static creep loading condition, the multiaxial stress fields appear due to the plastic constraint and they produce a more brittle type cracking behavior. From a practical standpoint, the characterizations of creep crack growth rates under the multiaxial stress field are important to improve the methods for creep life extension. In this paper, creep crack growth tests were conducted using round bar specimens with sharp circular notches for tungsten-added 12%Cr ferritic heat-resistant steel (W12%Cr steel), and the effect of multiaxiality on creep ductility and creep crack growth rate were investigated. Furthermore, three-dimensional elastic-plastic creep finite element analyses were conducted to clarify the effect of multiaxiality on creep crack growth.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry and size of a circular notched specimen

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Figure 2

The concept of multiaxial stress due to the plastic constraint

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Figure 3

Geometry and size of a C(T) specimen

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Figure 4

The fracture surface of a circular notched specimen for the W12%Cr steel

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Figure 5

The characteristic of load line displacement of circular notched and C(T) specimens for W12%Cr steel under creep condition

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Figure 6

The characteristic of load line displacement of circular notched and C(T) specimens for Cr–Mo–V steel under creep condition

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Figure 7

The relationship between the creep crack growth rate and C* of circular notched specimens for W12%Cr steel

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Figure 8

The relationship between the creep crack growth rate and the load line displacement rate of circular notched specimens for W12%Cr steel

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Figure 9

The relationship between the creep crack growth rate and the stress intensity factor K of circular notched specimens for W12%Cr steel

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Figure 10

The relationship between the creep crack growth rate and the inverse values of the absolute temperature of circular notched specimens for W12%Cr steel in the region of constant crack growth rate

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Figure 11

The relationship between the creep crack growth rate and the initial stress intensity factor of circular notched specimens for W12%Cr steel in the region of constant crack growth rate

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Figure 12

The relationship between the creep crack growth rate and the Q* parameter of circular notched specimens for W12%Cr steel

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Figure 13

Master curve of the estimation of the creep crack growth life of a circular notched specimen for W12%Cr steel based on Q* concept

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Figure 14

The relationship between the life of creep crack growth and the steady-state creep rate for W12%Cr and Cr–Mo–V steels

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Figure 15

Three-dimensional elastic-plastic creep analysis model of a circular notched specimen (Φ=10mm, a0=1.5mm)

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Figure 16

Three-dimensional elastic-plastic creep analysis model of upper half part of a C(T) specimen with SG (W=50.8mm, B=25.4mm)

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Figure 17

The stress triaxial factor TF distribution of a circular notched specimen and C(T) specimens with and without side-grooves for W12%Cr and Cr–Mo–V steels

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Figure 18

Effects of multiaxial stress, material microstructures, and aging on the law of creep crack growth life

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