Effect of single plastic prestraining on crack resistance. 1. The rate of fatigue crack growth in heat-resistant steel

1988 ◽  
Vol 20 (12) ◽  
pp. 1552-1558 ◽  
Author(s):  
V. T. Troshchenko ◽  
P. V. Yasnii ◽  
V. V. Pokrovskii ◽  
B. T. Timofeev ◽  
V. A. Fedorova
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Resistance ◽  
Crack Growth ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Plastic Prestraining

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.

Double influence of hydrogen on fatigue crack growth in heat-resistant steels

1995 ◽  
Vol 30 (4) ◽  
pp. 403-409
Author(s):  
H. M. Nykyforchyn ◽  
O. Z. Student ◽  
I. D. Skrypnyk
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Heat Resistant ◽  
Heat Resistant Steels

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.

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