Characteristic of Crack Growth Life for W Added 9Cr Ferritic Heat Resistant Steel Under the Conditions of High Temperature Creep-Fatigue Multiplication Based on Non-Equilibrium Science

2007 ◽  
Author(s):  
A. T. Yokobori ◽  
R. Sugiura ◽  
D. Yoshino ◽  
M. Tabuchi ◽  
Y. Hasegawa
Keyword(s):  
Crack Growth ◽  
Resistant Steel ◽  
Boiler Tube ◽  
Tube Material ◽  
P92 Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Creep Fatigue ◽  
Cycle Dependent ◽  
Non Equilibrium

The W added 9Cr ferritic heat resistant steel ASME grade P92, developed as a boiler tube material, is used under the conditions of creep-fatigue multiplication. In this paper, using P92 steel, crack growth tests under the conditions of creep-fatigue multiplication were conducted and the effects of cycle-dependent and time-dependent mechanisms on the crack growth life tf were investigated. Furthermore, on the basis of the concept of non-equilibrium science, the multiple effects of creep and fatigue on the crack growth life tf were clarified.

The Law of Crack Growth Life Under Load Controlled Creep-Fatigue Conditions for W-Added 12% Cr Steel

2016 ◽  
Author(s):  
Yoshiko Nagumo ◽  
A. Toshimitsu Yokobori ◽  
Takahiro Fukuda ◽  
Yoshiki Takahashi ◽  
Ryuji Sugiura
Keyword(s):  
Crack Growth ◽  
Three Dimensional ◽  
Turbine Rotor ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Creep Fatigue ◽  
The Law ◽  
Cycle Dependent ◽  
Dependent Mechanism

W-added 12% Cr ferritic heat resistant steel has been used as a steam turbine rotor material. The turbine rotor material is damaged by high temperature creep and fatigue due to starts and stops and changing load of power generation, which results in crack initiation and growth. In the studies done before, the law of crack growth life under creep-fatigue conditions was characterized and clarified that the characteristics of crack growth life of various load frequencies under different temperatures change from fatigue to creep behavior through an inflection region. The law of crack growth life under creep-fatigue interactive conditions has been reported and evaluated by monotonous linear law. On the other hand, it has been indicated that the characteristics of crack growth life under creep-fatigue condition can be represented mathematically by a three dimensional characteristic curved surface based on non-equilibrium science. In this study, crack growth tests using standardized C(T) specimens of W-added 12% Cr ferritic heat resistant steel were conducted under various conditions of stress holding time, applied stress and temperature. To evaluate the effect of cycle dependent and time dependent mechanisms on crack growth life, a method of separate estimation of cycle dependent mechanism from the time dependent mechanism based on the concept of three dimensional characteristic curved surface based on non-equilibrium science were used. As a result, the effect of load frequency on crack growth life was characterized and the predictive law of crack growth life for W-added 12% Cr ferritic heat resistant steel under creep-fatigue interactive conditions based on the concept of Q* with the transition function of crack growth life was estimated.

131 Law of Crack Growth Life for W-added 9%Cr Ferritic Heat Resistant Steel under the Condition of Creep-Fatigue Multiplication

2009 ◽  
Vol 2009.44 (0) ◽  
pp. 60-61
Author(s):  
Shuji Kimoto ◽  
Ryuji Sugiura ◽  
A. Toshimitsu Jr. Yokobori ◽  
Takashi Matsuzaki ◽  
Daichi Yoshino
Keyword(s):  
Crack Growth ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Creep Fatigue

102 Law of Crack Growth Life for W-added 9%Cr Ferritic Heat Resistant Steel under the Condition of Creep-Fatigue Multiplication

2010 ◽  
Vol 2010.45 (0) ◽  
pp. 8-9
Author(s):  
Shuji Kimoto ◽  
Ryuji Sugiura ◽  
A. Toshimitsu Jr Yokobori ◽  
Takashi Matsuzaki ◽  
Daichi Yoshino
Keyword(s):  
Crack Growth ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Creep Fatigue

169 Law of Crack Growth Life for W-added 12%Cr Ferritic Heat Resistant Steel under the Condition of Creep-Fatigue Multiplication

2014 ◽  
Vol 2014.49 (0) ◽  
pp. 135-136
Author(s):  
Takahiro Fukuda ◽  
Ryuji Sugiura ◽  
A. Toshimitsu Jr Yokobori ◽  
Takashi Matsuzaki
Keyword(s):  
Crack Growth ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Creep Fatigue

Self-Organisation of the Heat Resistant Steel Structure Following Dynamic Non-Equilibrium Processes

2015 ◽  
Vol 220-221 ◽  
pp. 917-921 ◽  
Author(s):  
Mykola Chausov ◽  
Pavlo Maruschak ◽  
Olegas Prentkovskis ◽  
Andriy Pylypenko ◽  
Valentyn Berezin ◽  
...  
Keyword(s):  
Dissipative Structure ◽  
Steel Structure ◽  
Image Correlation ◽  
Experimental Methodology ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Equilibrium Processes ◽  
Equilibrium Process ◽  
Non Equilibrium

Using an original experimental methodology and software for contactless investigation into strains applying the method of digital image correlation, conditions for DNP realization in the test setup with pre-set rigidity have been found. Strain velocities have been determined to be equal to 2...10 s–1 in the processes of forming and developing a dissipative structure of heat resistant steel under the DNP (dynamic non-equilibrium process).

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