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The Influence of Ultrasonic Impact Treatment (UIT) on the Mechanical Properties of the Additively Manufactured SS 17-4PH and IN718 Alloys : = An Experimental Investigation.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	The Influence of Ultrasonic Impact Treatment (UIT) on the Mechanical Properties of the Additively Manufactured SS 17-4PH and IN718 Alloys :/
其他題名:	An Experimental Investigation.
作者:	Mazruee Sebdani, Rasool.
面頁冊數:	1 online resource (124 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-07, Section: B.
Contained By:	Dissertations Abstracts International85-07B.
標題:	Plastics. -
電子資源:	click for full text (PQDT)
ISBN:	9798381428469

The Influence of Ultrasonic Impact Treatment (UIT) on the Mechanical Properties of the Additively Manufactured SS 17-4PH and IN718 Alloys : = An Experimental Investigation.
Mazruee Sebdani, Rasool.

The Influence of Ultrasonic Impact Treatment (UIT) on the Mechanical Properties of the Additively Manufactured SS 17-4PH and IN718 Alloys :An Experimental Investigation. - 1 online resource (124 pages)

Source: Dissertations Abstracts International, Volume: 85-07, Section: B.

Thesis (Ph.D.)--Clarkson University, 2023.

Includes bibliographical references

The metal parts manufactured by additive manufacturing (AM) technologies in their as-built condition suffer from a significantly inferior surface finish and a higher prevalence of microstructural defects such as higher porosities compared to conventionally manufactured parts. These undesirable surface and internal defects can degrade mechanical properties, especially the ductility and the fatigue performance under cyclic loading. The primary goal of the research work presented in this thesis is to investigate the effectiveness of extending ultrasonic impact treatment (UIT), a recently developed technique to mitigate internal defects and successfully demonstrated for improving the quasi-static properties of austenitic stainless steel 316L (SS 316L), to martensitic steels and nickel-based superalloys. Stainless steel 17-4 PH (SS 17-4 PH) and Inconel 718 (IN718) are selected for this study as representative materials for the martensitic steel and nickel-based superalloys, respectively. SS 17-4 PH is a high-strength alloy extensively used in advanced technologies such as aerospace applications. Likewise, IN718 is a widely used aerospace alloy for its high performance at elevated temperatures. Both metals have a great tradition in the field of AM. A second major goal of the research work is the development of a technique to perform high throughput surface-finishing of the geometrically complex AM parts.In principle, UIT is an in-situ technique that uses ultrasonic surface peening to plastically deform and consolidate printed layers at regular intervals during AM. Under as-built conditions, the mechanical properties of most AM alloys are inferior to their conventionally manufactured counterparts. As reported in the literature, the inferior properties are attributed to internal pores and defects inherent to the AM process. The consolidation of printed layers with plastic deformation is anticipated to modify and mitigate the internal pores and defects yielding desirable properties. While the method has been successfully demonstrated for enhancing quasi-static properties of SS 316L its effectiveness for martensitic steels, alloys that exhibit poor strain-hardening ability, has not been studied. Likewise, the effectiveness of UIT for enhancing fatigue properties is also unclear.In this research work, first, the enhancement of the quasi-static properties of SS 17-4 PH with the aid of UIT is investigated. The specimens manufactured using powder bed fusion (PBF) and PBF combined with UIT (PBF/UIT) are subjected to the same standard post-build heat treatments for solution hardening and aging. The mechanical testing reveals that the PBF/UIT specimens have a simultaneous enhancement in strength and ductility. The mechanism responsible for this remarkable enhancement in properties is identified with the aid of microstructural characterization and X-ray diffraction (XRD) analysis. The microstructural characterization reveals that the severe plastic deformation drives diffusional reversion of the austenite phase during deposition and inhibition of the martensitic phase transformation during the post-build heat treatment. The severe plastic deformation induced by UIT also drives microstructural relaxation and recrystallization under heat treatment, reducing defects extensively.As the second objective of this study, the effectiveness of UIT in enhancing the low cycle fatigue properties of nickel-based superalloys such as Inconel 718 (IN718) is investigated. The cyclic fatigue results show that the UIT can enhance LCF by about 100%. Such a dramatic enhancement is attributed to a general increase in the strength and toughness of the material due to UIT. Characterization of the fractured surfaces reveals that the crack propagation rate and formation of secondary cracks decrease in the PBF/UIT specimens substantially. The mechanism responsible for the general increase in strength and ductility leading to a dramatic increase in LCF is the increased resistance to fracture propagation due to lattice distortion (residual stress at the nanoscale) introduced by the plastic deformation as established by the XRD analysis.The third and final objective of this study is a novel post-build polishing prototype to enhance the surface finish of geometrically complex AM parts. The method, named vibration-driven high-pressure-abrasive surface polisher (VD-HPA-SP), uses the motion of abrasives at high pressure on the exposed surfaces of the part. The preliminary obtained results established the viability of the proposed concept by quantitatively characterizing the effect of polishing pressure on the smooth surface of the plastic sample in terms of more than 100 times increase in surface roughness.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798381428469Subjects--Topical Terms:

563477
Plastics.
Subjects--Index Terms:

Martensitic steelsIndex Terms--Genre/Form:

554714
Electronic books.

The Influence of Ultrasonic Impact Treatment (UIT) on the Mechanical Properties of the Additively Manufactured SS 17-4PH and IN718 Alloys : = An Experimental Investigation.
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520 $a The metal parts manufactured by additive manufacturing (AM) technologies in their as-built condition suffer from a significantly inferior surface finish and a higher prevalence of microstructural defects such as higher porosities compared to conventionally manufactured parts. These undesirable surface and internal defects can degrade mechanical properties, especially the ductility and the fatigue performance under cyclic loading. The primary goal of the research work presented in this thesis is to investigate the effectiveness of extending ultrasonic impact treatment (UIT), a recently developed technique to mitigate internal defects and successfully demonstrated for improving the quasi-static properties of austenitic stainless steel 316L (SS 316L), to martensitic steels and nickel-based superalloys. Stainless steel 17-4 PH (SS 17-4 PH) and Inconel 718 (IN718) are selected for this study as representative materials for the martensitic steel and nickel-based superalloys, respectively. SS 17-4 PH is a high-strength alloy extensively used in advanced technologies such as aerospace applications. Likewise, IN718 is a widely used aerospace alloy for its high performance at elevated temperatures. Both metals have a great tradition in the field of AM. A second major goal of the research work is the development of a technique to perform high throughput surface-finishing of the geometrically complex AM parts.In principle, UIT is an in-situ technique that uses ultrasonic surface peening to plastically deform and consolidate printed layers at regular intervals during AM. Under as-built conditions, the mechanical properties of most AM alloys are inferior to their conventionally manufactured counterparts. As reported in the literature, the inferior properties are attributed to internal pores and defects inherent to the AM process. The consolidation of printed layers with plastic deformation is anticipated to modify and mitigate the internal pores and defects yielding desirable properties. While the method has been successfully demonstrated for enhancing quasi-static properties of SS 316L its effectiveness for martensitic steels, alloys that exhibit poor strain-hardening ability, has not been studied. Likewise, the effectiveness of UIT for enhancing fatigue properties is also unclear.In this research work, first, the enhancement of the quasi-static properties of SS 17-4 PH with the aid of UIT is investigated. The specimens manufactured using powder bed fusion (PBF) and PBF combined with UIT (PBF/UIT) are subjected to the same standard post-build heat treatments for solution hardening and aging. The mechanical testing reveals that the PBF/UIT specimens have a simultaneous enhancement in strength and ductility. The mechanism responsible for this remarkable enhancement in properties is identified with the aid of microstructural characterization and X-ray diffraction (XRD) analysis. The microstructural characterization reveals that the severe plastic deformation drives diffusional reversion of the austenite phase during deposition and inhibition of the martensitic phase transformation during the post-build heat treatment. The severe plastic deformation induced by UIT also drives microstructural relaxation and recrystallization under heat treatment, reducing defects extensively.As the second objective of this study, the effectiveness of UIT in enhancing the low cycle fatigue properties of nickel-based superalloys such as Inconel 718 (IN718) is investigated. The cyclic fatigue results show that the UIT can enhance LCF by about 100%. Such a dramatic enhancement is attributed to a general increase in the strength and toughness of the material due to UIT. Characterization of the fractured surfaces reveals that the crack propagation rate and formation of secondary cracks decrease in the PBF/UIT specimens substantially. The mechanism responsible for the general increase in strength and ductility leading to a dramatic increase in LCF is the increased resistance to fracture propagation due to lattice distortion (residual stress at the nanoscale) introduced by the plastic deformation as established by the XRD analysis.The third and final objective of this study is a novel post-build polishing prototype to enhance the surface finish of geometrically complex AM parts. The method, named vibration-driven high-pressure-abrasive surface polisher (VD-HPA-SP), uses the motion of abrasives at high pressure on the exposed surfaces of the part. The preliminary obtained results established the viability of the proposed concept by quantitatively characterizing the effect of polishing pressure on the smooth surface of the plastic sample in terms of more than 100 times increase in surface roughness.
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