scholarly journals Creep crack growth in power plant materials

Sadhana ◽  
1995 ◽  
Vol 20 (1) ◽  
pp. 53-85 ◽  
Author(s):  
Parmeet S Grover ◽  
Ashok Saxena
Keyword(s):  
Power Plant ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Plant Materials ◽  
Creep Crack

Creep Crack Growth Behavior in Power Plant Boiler and Steam Pipe Steels

1988 ◽  
Vol 110 (2) ◽  
pp. 137-146 ◽  
Author(s):  
A. Saxena ◽  
J. Han ◽  
K. Banerji
Keyword(s):  
Power Plant ◽  
Crack Growth ◽  
Test Temperature ◽  
Creep Crack Growth ◽  
Growth Behavior ◽  
Life Assessment ◽  
Impurity Level ◽  
Crack Growth Behavior ◽  
Creep Crack ◽  
Service Degradation

One of the important ingredients in remaining creep crack growth life assessment of elevated temperature power plant components is the material creep crack growth rate data. This report summarizes the currently available data on Cr-Mo and Cr-Mo-V steels most commonly used in steam pipes and boilers. All data are correlated with the crack-tip parameter, Ct. The accompanying creep deformation data and tensile properties are also included. The influence of in-service degradation, test temperature and the welding parameters such as impurity level and post-weld heat treatment (PWHT) on the creep crack growth behavior were examined. It was shown that the influence of nominal material chemistry, service degradation and test temperature can be normalized into a single da/dt versus Ct trend for the base materials. It was also shown that the level of impurities and the PWHT can significantly influence the da/dt versus Ct behavior in weldments.

Estimation of Creep Crack Growth Properties Using Circumferential Notched Round Bar Specimen for 12CrWCoB Rotor Steel

2005 ◽  
Vol 297-300 ◽  
pp. 397-402
Author(s):  
Je Chang Ha ◽  
Joon Hyun Lee ◽  
Masaaki Tabuchi ◽  
A.Toshimitsu Yokobori Jr.
Keyword(s):  
Crack Growth ◽  
Axial Stress ◽  
Creep Crack Growth ◽  
Turbine Rotor ◽  
Rotor Steel ◽  
Creep Ductility ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Round Bar ◽  
Growth Properties

Most heat resisting materials in structural components are used under multi-axial stress conditions and under such conditions ductile materials often exhibit brittle manner and low creep ductility at elevated temperature. Creep crack initiation and growth properties are also affected by multi-axial stress and it is important to evaluate these effects when laboratory data are applied to structural components. Creep crack growth tests using circumferential notched round bar specimens are a simple method to investigate multi-axial stress effects without using complicated test facilities. Creep crack growth tests have been performed using a 12CrWCoB turbine rotor steel. In order to investigate the effects of multi-axial stress on creep crack growth properties, the tests were conducted for various notch depths at 650°C. The circumferential notched round bar specimen showed brittle crack growth behaviour under multi-axial stress conditions. Creep crack growth rate was characterized in terms of the C* parameter. A 12CrWCoB turbine rotor steel has been tested using circumferential notched round bar specimens with different multi-axiality. Circumferential notched round bar specimens show increased brittle creep crack growth behaviour due to the multi-axial stress condition. Creep crack growth properties could be predicted by allowing for the decrease of creep ductility under multi-axial conditions.

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