Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy

<p>Inconel 718 is a nickel-based superalloy with a series of superior properties, such as high strength, creep-resistance, and corrosion-resistance. Additive manufacturing (AM) is appealing to Inconel 718 because of its near-net-shape production capability to circumvent poor machinability. How...

Full description

Bibliographic Details
Main Author:	Johnson, Alexander Scott
Other Authors:	Tonya W. Stone
Format:	Others
Language:	en
Published:	MSSTATE 2017
Subjects:	Mechanical Engineering
Online Access:	http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-102735/

id	ndltd-MSSTATE-oai-library.msstate.edu-etd-03232017-102735
record_format	oai_dc
spelling	ndltd-MSSTATE-oai-library.msstate.edu-etd-03232017-1027352019-05-15T18:44:00Z Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy Johnson, Alexander Scott Mechanical Engineering <p>Inconel 718 is a nickel-based superalloy with a series of superior properties, such as high strength, creep-resistance, and corrosion-resistance. Additive manufacturing (AM) is appealing to Inconel 718 because of its near-net-shape production capability to circumvent poor machinability. However, AM parts are prone to detrimental porosity, reducing their fatigue resistance. Thus, further understanding of AM fatigue behavior is required before widespread industrial use. The microstructural and fatigue properties of heat treated AM Inconel 718, produced using Laser Engineered Net Shaping (LENS<sup>TM</sup>), are evaluated at room and elevated temperatures. Fully reversed, strain-controlled fatigue tests were performed on cylindrical specimens at strain amplitudes of 0.001 to 0.01 mm/mm. Fracture surfaces were inspected using a scanning electron microscope (SEM). Heat treatment caused initial dendritic microstructure to mostly re-form into an equiaxed grain structure. AM specimens experienced reduced fatigue life in testing as compared to wrought material due to inclusions or pores near the surface </p> Tonya W. Stone Nima Shamsaei Haley R. Doude Matthew W. Priddy MSSTATE 2017-04-18 text application/pdf http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-102735/ http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-102735/ en unrestricted I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, Dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Mississippi State University Libraries or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, Dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, Dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, Dissertation, or project report.
collection	NDLTD
language	en
format	Others
sources	NDLTD
topic	Mechanical Engineering
spellingShingle	Mechanical Engineering Johnson, Alexander Scott Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy
description	<p>Inconel 718 is a nickel-based superalloy with a series of superior properties, such as high strength, creep-resistance, and corrosion-resistance. Additive manufacturing (AM) is appealing to Inconel 718 because of its near-net-shape production capability to circumvent poor machinability. However, AM parts are prone to detrimental porosity, reducing their fatigue resistance. Thus, further understanding of AM fatigue behavior is required before widespread industrial use. The microstructural and fatigue properties of heat treated AM Inconel 718, produced using Laser Engineered Net Shaping (LENS<sup>TM</sup>), are evaluated at room and elevated temperatures. Fully reversed, strain-controlled fatigue tests were performed on cylindrical specimens at strain amplitudes of 0.001 to 0.01 mm/mm. Fracture surfaces were inspected using a scanning electron microscope (SEM). Heat treatment caused initial dendritic microstructure to mostly re-form into an equiaxed grain structure. AM specimens experienced reduced fatigue life in testing as compared to wrought material due to inclusions or pores near the surface </p>
author2	Tonya W. Stone
author_facet	Tonya W. Stone Johnson, Alexander Scott
author	Johnson, Alexander Scott
author_sort	Johnson, Alexander Scott
title	Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy
title_short	Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy
title_full	Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy
title_fullStr	Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy
title_full_unstemmed	Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy
title_sort	fatigue behavior and microstructure of direct laser deposited inconel 718 alloy
publisher	MSSTATE
publishDate	2017
url	http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-102735/
work_keys_str_mv	AT johnsonalexanderscott fatiguebehaviorandmicrostructureofdirectlaserdepositedinconel718alloy
_version_	1719086060323995648

Fatigue behavior and microstructure of direct laser deposited Inconel 718 alloy

Similar Items