THE EFFECT OF SMALL AMOUNTS OF Mg AND Zr ON CREEP CRACK GROWTH BEHAVIOUR OF A Ni-BASE SUPERALLOY

1988 ◽  
pp. 957-962
Author(s):  
Encai Guo ◽  
Fengqin Xu
Keyword(s):  
Crack Growth ◽  
Creep Crack Growth ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Base Superalloy

Influence of Prior Deformation on Creep Crack Growth Behaviour of 316H Austenitic Steels

2012 ◽  
Author(s):  
Hamed Yazdani Nezhad ◽  
Noel P. O’Dowd ◽  
Catrin M. Davies ◽  
Ali N. Mehmanparast ◽  
Kamran M. Nikbin
Keyword(s):  
Crack Growth ◽  
Creep Crack Growth ◽  
Compact Tension ◽  
Fe Analysis ◽  
Austenitic Steels ◽  
Creep Data ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Good Agreement

The influence of pre-strain and pre-stress on creep crack growth behaviour of 316H austenitic steels is studied experimentally and numerically in this paper. Compact tension, C(T), specimens (25mm thickness) have been extracted from two steam headers, one as-received and one uniformly compressed to the strain value of 8%. The C(T) specimen extracted from the as-received header was compressed, introducing a non-uniform strain field. Creep crack growth (CCG) tests were performed at 550°C. Comparisons have been provided with the results from as-received C(T) specimens. Finite element (FE) analysis has been carried out to simulate the CCG behaviour of the C(T) specimens. By choosing the problem parameters appropriately, good agreement may be achieved between the FE predictions and the creep data.

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