Effect of high-temperature degradation of heat-resistant steel on the mechanical and fractographic characteristics of fatigue crack growth

1999 ◽  
Vol 35 (4) ◽  
pp. 499-508 ◽  
Author(s):  
O. Z. Student ◽  
W. Dudziński ◽  
H. M. Nykyforchyn ◽  
A. Kamińska
Keyword(s):  
Fatigue Crack ◽  
High Temperature ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant

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

Study on the High Temperature Creep Behavior of 30Cr25Ni20 Heat-Resistant Steel

2019 ◽  
Vol 814 ◽  
pp. 157-162
Author(s):  
You Yang ◽  
Xiao Dong Wang ◽  
Wei Feng Tang
Keyword(s):  
High Temperature ◽  
Internal Structure ◽  
Creep Strain ◽  
High Temperature Creep ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Creep Fracture ◽  
Heat Resistant ◽  
Temperature Creep ◽  
Before And After

The high temperature creep test of heat-resisting steel 30Cr25Ni20 for automobile exhaust manifolds was carried out, and the creep strain-time curves at 650°C and 700°C in the different loads were obtained. The effects of different creep temperature and stress on creep life of materials were studied. The microstructure of the fracture after creep was observed by scanning electron microscopy. Microstructures before and after creep at different temperatures were compared by optical microscopy. The results show that the creep fracture life of heat-resistant steel decreases with the increase of stress at the same temperature. The creep fracture life decreases with the increase of temperature at the same stress, too. The fracture of heat-resistant steel shows good high temperature plasticity and a ductile fracture after creep. The fracture dimples become deeper with the increase of stress. At 650°Cand 700°C, the stress exponent is 8.6 and 6, respectively. When the sample was subjected to high temperature creep at 700°C, the precipitates increase obviously and the reticular structure became very large. At this point, the internal structure of the material is destroyed, and the matrix structure becomes unevenly distributed. The failure of the internal structure leads to the dramatic increase of the creep strain, and the failure of the internal structure will be more serious with the deformation of the sample.

scholarly journals Fatigue crack growth behaviour of Inconel 718 – the concept of a damaged zone caused by high temperature hold times

2011 ◽  
Vol 10 ◽  
pp. 2821-2826 ◽  
Author(s):  
David Gustafsson ◽  
Johan Moverare ◽  
Kjell Simonsson ◽  
Sten Johansson ◽  
Magnus Hörnqvist ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
High Temperature ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Inconel 718 ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Damaged Zone

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.

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