Creep characteristics of austenitic stainless steel foil at elevated temperature

High efficiency and compact recuperator with thin foil corrugated air cell as the primary surface is employed in clean and efficient microturbine system (100 kW). Current primary surface recuperators are made of AISI 347 austenitic stainless steel foils that operate at gas inlet temperature of less...

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Main Author:	Shahrul Azhar, Ilya Izyan
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/42086/1/IlyaIzyanShahrulAzharMFKM2013.pdf
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id	my-utm-ep.42086
record_format	uketd_dc
spelling	my-utm-ep.420862017-07-06T02:39:27Z Creep characteristics of austenitic stainless steel foil at elevated temperature 2013 Shahrul Azhar, Ilya Izyan TA Engineering (General). Civil engineering (General) High efficiency and compact recuperator with thin foil corrugated air cell as the primary surface is employed in clean and efficient microturbine system (100 kW). Current primary surface recuperators are made of AISI 347 austenitic stainless steel foils that operate at gas inlet temperature of less than 650 °C and attain approximately 30 percent of efficiency. Efficiency of greater than 40 percent is possible with the increase in turbine inlet temperature to 1230 °C, and as a result recuperator inlet temperature increase to 843 °C. This study establishes base line creep rupture behaviour of AISI 347 austenitic stainless steel foils at operating temperature of 700 °C and applied stress of 100 MPa. Creep behaviour of the foil shows that the primary creep stage is short and creep life of the foil is dominated by tertiary creep deformation. The time to rupture for the foil specimen is 184 hours with the corresponding rupture strain of 8.6 percent. Creep curves for AISI 347 austenitic stainless steel foil at 700 °C, 100 MPa are represented by the modified Theta-Projection concept model with hardening and softening terms. The creep coefficients, ?1 and ?3, and the exponent a are -0.6849, 0.6726 and 0.0038 respectively. Theta-Projection parameters values of experimental creep at temperature of 700 °C and applied stress of range 54-221 MPa shows a sudden gradient change at applied stress of 150 MPa possibly due to different mechanism of dislocation movements and microstructure changes. Two different creep failure mechanisms for austenitic stainless steel foils are possible since the creep failure data falls very close to the boundary of dislocation and diffusion creep regions in the creep mechanism map for bulk material 2013 Thesis http://eprints.utm.my/id/eprint/42086/ http://eprints.utm.my/id/eprint/42086/1/IlyaIzyanShahrulAzharMFKM2013.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:78209?queryType=vitalDismax&query=Creep+characteristics+of+austenitic+stainless+steel+foil+at+elevated+temperature masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Shahrul Azhar, Ilya Izyan Creep characteristics of austenitic stainless steel foil at elevated temperature
description	High efficiency and compact recuperator with thin foil corrugated air cell as the primary surface is employed in clean and efficient microturbine system (100 kW). Current primary surface recuperators are made of AISI 347 austenitic stainless steel foils that operate at gas inlet temperature of less than 650 °C and attain approximately 30 percent of efficiency. Efficiency of greater than 40 percent is possible with the increase in turbine inlet temperature to 1230 °C, and as a result recuperator inlet temperature increase to 843 °C. This study establishes base line creep rupture behaviour of AISI 347 austenitic stainless steel foils at operating temperature of 700 °C and applied stress of 100 MPa. Creep behaviour of the foil shows that the primary creep stage is short and creep life of the foil is dominated by tertiary creep deformation. The time to rupture for the foil specimen is 184 hours with the corresponding rupture strain of 8.6 percent. Creep curves for AISI 347 austenitic stainless steel foil at 700 °C, 100 MPa are represented by the modified Theta-Projection concept model with hardening and softening terms. The creep coefficients, ?1 and ?3, and the exponent a are -0.6849, 0.6726 and 0.0038 respectively. Theta-Projection parameters values of experimental creep at temperature of 700 °C and applied stress of range 54-221 MPa shows a sudden gradient change at applied stress of 150 MPa possibly due to different mechanism of dislocation movements and microstructure changes. Two different creep failure mechanisms for austenitic stainless steel foils are possible since the creep failure data falls very close to the boundary of dislocation and diffusion creep regions in the creep mechanism map for bulk material
format	Thesis
qualification_level	Master's degree
author	Shahrul Azhar, Ilya Izyan
author_facet	Shahrul Azhar, Ilya Izyan
author_sort	Shahrul Azhar, Ilya Izyan
title	Creep characteristics of austenitic stainless steel foil at elevated temperature
title_short	Creep characteristics of austenitic stainless steel foil at elevated temperature
title_full	Creep characteristics of austenitic stainless steel foil at elevated temperature
title_fullStr	Creep characteristics of austenitic stainless steel foil at elevated temperature
title_full_unstemmed	Creep characteristics of austenitic stainless steel foil at elevated temperature
title_sort	creep characteristics of austenitic stainless steel foil at elevated temperature
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2013
url	http://eprints.utm.my/id/eprint/42086/1/IlyaIzyanShahrulAzharMFKM2013.pdf
_version_	1747816686568865792

Creep characteristics of austenitic stainless steel foil at elevated temperature

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