The formation of multipoles during high-temperature creep of austenitic stainless steels

1981 ◽  
Vol 16 (10) ◽  
pp. 2860-2866 ◽  
Author(s):  
P. R. Howell ◽  
J. O. Nilsson ◽  
A. Horsewell ◽  
G. L. Dunlop
Keyword(s):  
High Temperature ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
High Temperature Creep ◽  
Temperature Creep

Stable and Unstable Fatigue Crack Propagation During High Temperature Creep-Fatigue in Austenitic Steels: The Role of Precipitation

1979 ◽  
Vol 101 (3) ◽  
pp. 275-283 ◽  
Author(s):  
G. J. Lloyd ◽  
J. Wareing
Keyword(s):  
Fatigue Crack ◽  
High Temperature ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Austenitic Steels ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Creep Fatigue

The distinction between stable and unstable fatigue crack propagation during high temperature creep-fatigue in austenitic stainless steels is introduced. The transition from one class of behavior to the other is related to the precipitate distribution and to the nature of the prevailing crack path. It is shown by reference to new studies and examples drawn from the literature that this behavior is common to both high strain and predominantly elastic fatigue in austenitic stainless steels. The relevance of this distinction to a mechanistic approach to high temperature plant design is discussed.

Microanalysis for Design and Development of Improved High-Temperature Alloys

2001 ◽  
Vol 7 (S2) ◽  
pp. 544-545
Author(s):  
Philip J. Maziasz
Keyword(s):  
High Temperature ◽  
Creep Resistance ◽  
Power Plants ◽  
Austenitic Stainless Steels ◽  
High Temperature Creep ◽  
Alloy Development ◽  
Temperature Creep ◽  
Microstructural Design ◽  
Engineering Alloys ◽  
Processing Optimization

Alloy development can range from purely empirical, trial-and-error efforts to very theoretical, based on either fundamental first-principles calculations or computational-modeling using various kinds of data base inputs. However, “real-world” efforts to improve or optimize complex engineering alloys often cannot afford the time or cost of either extreme approach. in the past 10-15 years, an alloy development and processing optimization methodology has been developed that utilizes strategic microanalytical data (both detailed microstucture and microcompositional information) as the critical input that then enables efficient and effective design of various kinds of alloys for improved high-temperature performance [1-6]. in many cases, first time tests produce outstanding high-temperature creep or creep-rupture results, and enable improvements without trading off one property for another. This invited paper will highlight several examples of significantly improved creep resistance obtained using such microstructural design.This microstructural design methodology for high-temperature creep-resistance was initially developed for and demonstrated in austenitic stainless steels (Fe-14Cr-16Ni) designed for improved creep-strength and rupture resistance at 700°C and above for superheater and boiler tubing in advanced fossil power plants.

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