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Microstructural Investigations of 17-4 PH Stainless Steel Fabricated via Laser Powder Bed Fusion

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Microstructural Investigations of 17-4 PH Stainless Steel Fabricated via Laser Powder Bed Fusion/ Maxwell Moyle.
Author:	Moyle, Maxwell,
Description:	1 electronic resource (173 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-08, Section: B.
Contained By:	Dissertations Abstracts International86-08B.
Subject:	Industrial engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31863792
ISBN:	9798304902267

Microstructural Investigations of 17-4 PH Stainless Steel Fabricated via Laser Powder Bed Fusion
Moyle, Maxwell,

Microstructural Investigations of 17-4 PH Stainless Steel Fabricated via Laser Powder Bed Fusion [electronic resource] /Maxwell Moyle. - 1 electronic resource (173 pages)

Source: Dissertations Abstracts International, Volume: 86-08, Section: B.

Additive manufacturing (AM) offers significant advantages, such as design freedom and a reduction in material waste, compared to conventional manufacturing. 17-4 precipitate hardening (PH) stainless steel is used in a variety of applications including within the aerospace, marine, and chemical processing industries, largely due to its combination of corrosion resistance and its high strength, which is achieved by the formation of nanoscale Cu rich precipitates during thermal aging treatments. Owing to its favourable combination of properties, 17-4 PH has been widely researched for its applicability for AM via laser powder bed fusion (LPBF). However, a number of microstructural aspects of LPBF 17-4 PH remain unclear. There is inconsistency in literature surrounding the phase composition of as-printed builds. Furthermore, there has never been any systematic study using atom probe tomography (APT) to investigate the nanoscale Cu rich precipitates in additively manufactured 17-4 PH, despite the integral nature of these precipitates to the strength of the alloy. Given the fine scale of these precipitates in the industrially relevant heat treated states of 17-4 PH, APT is currently the only microscopic technique capable of adequately characterising them. This thesis applies multiple materials characterisation techniques, including APT, to comprehensively analyse 17-4 PH LPBF builds across multiple length scales and correlates these changes in the microstructure to mechanical properties. An initial study of the printing process on the grain structures and texture formed within builds was performed primarily using electron backscattered diffraction analysis. The next two chapters use APT to characterise the nanoscale precipitation behaviour of this material. The first investigates the effect of changing the intrinsic heat treatment on the Cu clustering and precipitation behaviour. The second analyses the phase transformation pathways in two variants of LPBF 17-4 PH resultant from standard heat treatments post AM. Finally, an in depth investigation of the mechanical properties and residual stress of builds as well as their microstructures' response to deformation is undertaken, correlating these effects with data from neutron scattering and tomography. This thesis provides a deeper understanding of how LPBF can affect the microstructures and properties of builds, driving towards greater industrial adoption of AM.

English

ISBN: 9798304902267Subjects--Topical Terms:

679492
Industrial engineering.
Subjects--Index Terms:

Additive manufacturing

Microstructural Investigations of 17-4 PH Stainless Steel Fabricated via Laser Powder Bed Fusion
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520 # $a Additive manufacturing (AM) offers significant advantages, such as design freedom and a reduction in material waste, compared to conventional manufacturing. 17-4 precipitate hardening (PH) stainless steel is used in a variety of applications including within the aerospace, marine, and chemical processing industries, largely due to its combination of corrosion resistance and its high strength, which is achieved by the formation of nanoscale Cu rich precipitates during thermal aging treatments. Owing to its favourable combination of properties, 17-4 PH has been widely researched for its applicability for AM via laser powder bed fusion (LPBF). However, a number of microstructural aspects of LPBF 17-4 PH remain unclear. There is inconsistency in literature surrounding the phase composition of as-printed builds. Furthermore, there has never been any systematic study using atom probe tomography (APT) to investigate the nanoscale Cu rich precipitates in additively manufactured 17-4 PH, despite the integral nature of these precipitates to the strength of the alloy. Given the fine scale of these precipitates in the industrially relevant heat treated states of 17-4 PH, APT is currently the only microscopic technique capable of adequately characterising them. This thesis applies multiple materials characterisation techniques, including APT, to comprehensively analyse 17-4 PH LPBF builds across multiple length scales and correlates these changes in the microstructure to mechanical properties. An initial study of the printing process on the grain structures and texture formed within builds was performed primarily using electron backscattered diffraction analysis. The next two chapters use APT to characterise the nanoscale precipitation behaviour of this material. The first investigates the effect of changing the intrinsic heat treatment on the Cu clustering and precipitation behaviour. The second analyses the phase transformation pathways in two variants of LPBF 17-4 PH resultant from standard heat treatments post AM. Finally, an in depth investigation of the mechanical properties and residual stress of builds as well as their microstructures' response to deformation is undertaken, correlating these effects with data from neutron scattering and tomography. This thesis provides a deeper understanding of how LPBF can affect the microstructures and properties of builds, driving towards greater industrial adoption of AM.
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650 # 4 $a Industrial engineering. $3 679492
650 # 4 $a Nanotechnology. $3 557660
650 # 4 $a Atoms & subatomic particles. $3 1372795
650 # 4 $a Stainless steel. $3 716611
650 # 4 $a Fractures. $3 645746
650 # 4 $a Yield stress. $3 1466222
650 # 4 $a Lasers. $3 557748
650 # 4 $a Residual stress. $3 1083680
650 # 4 $a Spectrum analysis. $3 582358
650 # 4 $a Materials science. $3 557839
650 # 4 $a Tensile strength. $3 1215672
650 # 4 $a Heat treating. $3 1372793
650 # 4 $a Scanning electron microscopy. $3 768680
650 # 4 $a Stress analysis. $3 1219176
650 # 4 $a Stress concentration. $3 895604
650 # 4 $a Microstructure. $3 643376
650 # 4 $a Solidification. $3 685755
650 # 4 $a Writing. $3 561099
650 # 4 $a Tomography. $3 528407
650 # 4 $a Mechanical properties. $3 1004682
653 # # $a Additive manufacturing
653 # # $a Laser powder bed fusion
653 # # $a Precipitate hardening
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690 $a 0546
690 $a 0652
710 2 # $a University of New South Wales (Australia). $e degree granting institution. $3 1503548
720 1 $a Primig, Sophie $e degree supervisor.
720 1 $a Haghdadi, Nima $e degree supervisor.
720 1 $a Ferry, Michael $e degree supervisor.
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791 $a Ph.D.
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