scholarly journals Mechanistic Considerations of Oxygen Enhanced Crack Growth in INCONEL 718

2001 ◽  
Author(s):  
R.P. Wei ◽  
C.F. Miller ◽  
Z.-F. Huang ◽  
G.W. Simmons
Keyword(s):  
Crack Growth ◽  
Inconel 718

Scatter in Dwell Time Cracking for a Ni-Based Superalloy in Combination With Overloads

2015 ◽  
Author(s):  
Erik Storgärds ◽  
Jonas Saarimäki ◽  
Kjell Simonsson ◽  
Sören Sjöström ◽  
David Gustafsson ◽  
...  
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Crack Growth ◽  
Material Properties ◽  
Inconel 718 ◽  
Dwell Time ◽  
The Other ◽  
Surface Cracks ◽  
Multiple Tests ◽  
Material Data

In this paper scatter in crack growth for dwell time loadings in combination with overloads has been investigated. Multiple tests were performed for surface cracks at 550°C in the commonly used high temperature material Inconel 718. The test specimens originate from two different batches which also provides for a discussion of how material properties affect the dwell time damage and overload impact. In combination with these tests an investigation of the microstructure was also carried out, which shows how it influences the growth rate. The results from this study show that, in order to take overloads into consideration when analysing spectrum loadings containing dwell times, one needs a substantial amount of material data available as the scatter seen from one batch to the other is of significant proportions.

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

Sustained-Load Crack-Growth in Inconel 718 Under Nonisothermal Conditions

1985 ◽  
Vol 107 (2) ◽  
pp. 172-179 ◽  
Author(s):  
G. K. Haritos ◽  
D. L. Miller ◽  
T. Nicholas
Keyword(s):  
Crack Growth ◽  
Growth Rates ◽  
Inconel 718 ◽  
Temperature Cycling ◽  
Maximum Temperature ◽  
Sustained Load ◽  
Temperature Profiles ◽  
Crack Growth Rates ◽  
Nonisothermal Conditions ◽  
Sustained Load Crack Growth

Sustained-load crack-growth experiments were conducted under isothermal and nonisothermal conditions. Temperature cycling was conducted between 537° and 649°C. Hold times at minimum and/or maximum temperature were included in the temperature profiles. An analytical model was developed to predict crack-growth rates based solely on isothermal data. The linear cumulative damage model was able to predict crack-growth rates in Inconel 718 for all the temperature profiles investigated including a proof test.

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