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In situ High Energy X-Ray Diffraction Characterization of Phase Transformations and Mechanical Behavior in Rapid Solidified Titanium and Stainless Steel Alloys.

Record Type:	Electronic resources : Monograph/item
Title/Author:	In situ High Energy X-Ray Diffraction Characterization of Phase Transformations and Mechanical Behavior in Rapid Solidified Titanium and Stainless Steel Alloys./
Author:	Johnson, Nathan Scott.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	412 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
Contained By:	Dissertations Abstracts International83-02B.
Subject:	X rays. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28264300
ISBN:	9798516976261

In situ High Energy X-Ray Diffraction Characterization of Phase Transformations and Mechanical Behavior in Rapid Solidified Titanium and Stainless Steel Alloys.
Johnson, Nathan Scott.

In situ High Energy X-Ray Diffraction Characterization of Phase Transformations and Mechanical Behavior in Rapid Solidified Titanium and Stainless Steel Alloys. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 412 p.

Source: Dissertations Abstracts International, Volume: 83-02, Section: B.

Thesis (Ph.D.)--Colorado School of Mines, 2021.

This item must not be sold to any third party vendors.

Advanced manufacturing techniques like additive manufacturing (AM) have poised themselves to revolutionize metal manufacturing. A wide range of AM techniques are capable of manufacturing metal components with unique, complex geometries and hastening the scientific-engineering-development cycle. Metal AM relies on a layer-by-layer rapid manufacturing process to build components from the substrate up. Rapid solidification is a large departure from traditional metal manufacturing due to its complex physics. Characterization of rapid solidification is difficult, stemming from the small volumes used in AM and the fast dynamics of the process. High energy X-ray diffraction (HEXRD) is a solution to the characterization problems of rapidly solidified alloys and AM. HEXRD can probe small volumes at fast rates and provides a wide range of thermomechanical and kinetic information. This thesis presents the application of HEXRD to rapidly solidified titanium and stainless steel alloys through a series of case studies. In the first two studies, HEXRD is applied torapidly solidified titanium and stainless steel welds. The materials are characterized for their temperature history, phase changes, kinetics, and microstructural evolution. In the next case study, HEXRD is applied to characterize phase changes in elastocaloric NiTi shape memory alloys (SMAs) under thermomechanical load. HEXRD, in conjunction with other tools,is used to explain the superior performance of the additively manufactured SMAs. In the final two case studies, HEXRD is used to measure the mechanical response of AM parts with complex geometries; namely, the octet truss lattice. Diffraction reveals a wide range of materials information about the AM microstructure including unexpected phases, texture,and mechanical response to loading. The mechanical results from HEXRD and then compared with theoretical predictions about the performance of octet truss lattices. Summarily, HEXRD is a diverse tool that is poised to address the complex characterization problems of many aspects of the additive manufacturing process.

ISBN: 9798516976261Subjects--Topical Terms:

3682558
X rays.
Subjects--Index Terms:

Additive manufacturing

In situ High Energy X-Ray Diffraction Characterization of Phase Transformations and Mechanical Behavior in Rapid Solidified Titanium and Stainless Steel Alloys.
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300 $a 412 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
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506 $a This item must not be sold to any third party vendors.
520 $a Advanced manufacturing techniques like additive manufacturing (AM) have poised themselves to revolutionize metal manufacturing. A wide range of AM techniques are capable of manufacturing metal components with unique, complex geometries and hastening the scientific-engineering-development cycle. Metal AM relies on a layer-by-layer rapid manufacturing process to build components from the substrate up. Rapid solidification is a large departure from traditional metal manufacturing due to its complex physics. Characterization of rapid solidification is difficult, stemming from the small volumes used in AM and the fast dynamics of the process. High energy X-ray diffraction (HEXRD) is a solution to the characterization problems of rapidly solidified alloys and AM. HEXRD can probe small volumes at fast rates and provides a wide range of thermomechanical and kinetic information. This thesis presents the application of HEXRD to rapidly solidified titanium and stainless steel alloys through a series of case studies. In the first two studies, HEXRD is applied torapidly solidified titanium and stainless steel welds. The materials are characterized for their temperature history, phase changes, kinetics, and microstructural evolution. In the next case study, HEXRD is applied to characterize phase changes in elastocaloric NiTi shape memory alloys (SMAs) under thermomechanical load. HEXRD, in conjunction with other tools,is used to explain the superior performance of the additively manufactured SMAs. In the final two case studies, HEXRD is used to measure the mechanical response of AM parts with complex geometries; namely, the octet truss lattice. Diffraction reveals a wide range of materials information about the AM microstructure including unexpected phases, texture,and mechanical response to loading. The mechanical results from HEXRD and then compared with theoretical predictions about the performance of octet truss lattices. Summarily, HEXRD is a diverse tool that is poised to address the complex characterization problems of many aspects of the additive manufacturing process.
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