Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


HDOAK_MTHESIS_FINAL.pdf (76.55 MB)

ETD Abstract Container

Abstract Header

EFFECT OF PROCESS VARIABLES ON SUB-MELT THERMAL BEHAVIOR AND SOLID-STATE PHASE TRANSFORMATIONS IN BEAM-BASED ADDITIVE MANUFACTURING OF TI-6AL-4V

Doak, Heather N
http://rave.ohiolink.edu/etdc/view?acc_num=wright1377509936

Abstract Details

2013, Master of Science in Engineering (MSEgr), Wright State University, Mechanical Engineering.
The success of laser and electron beam-based fabrication processes for additive manufacture and repair applications requires the ability to control melt pool geometry while maintaining a consistent and desirable microstructure. Previous work has employed a process map approach to link melt pool geometry to solidification microstructure (grain-size and morphology) in beam-based fabrication of Ti-6Al-4V. The current work extends the approach to investigate the effects of process variables on solid-state phase transformations below the solidification temperature through Finite Element Modeling, the 3-D Rosenthal Solution, and experimentation. Process maps for solid-state microstructure could be used to help maintain consistent and reliable mechanical properties during deposition of complex features. The characterization of seventeen Ti-6Al-4V samples was completed through Electron Backscatter Diffraction, X-ray Diffraction, Vickers Hardness tests. The solid-state transformation of Ti-6Al-4V was investigated to find trends in beta grain size, alpha lath thickness, and types of alpha microstructures. Thermal conditions and melt pool areas were verified with Finite Element Analysis and the fitted Rosenthal solution. Results suggest the solid-state alpha morphology is uniform because of constant melt pool area, constant grain area, and constant Vickers Hardness tests.
Nathan Klingbeil, Ph.D. (Advisor)
Raghavan Srinivasan, P.E., Ph.D. (Committee Member)
Jaimie Tiley, P.E., Ph.D. (Committee Member)
151 p.
Mechanical Engineering
mechanical engineering

Recommended Citations

Citations

  • Doak, H. N. (2013). EFFECT OF PROCESS VARIABLES ON SUB-MELT THERMAL BEHAVIOR AND SOLID-STATE PHASE TRANSFORMATIONS IN BEAM-BASED ADDITIVE MANUFACTURING OF TI-6AL-4V [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1377509936

    APA Style (7th edition)

  • Doak, Heather. EFFECT OF PROCESS VARIABLES ON SUB-MELT THERMAL BEHAVIOR AND SOLID-STATE PHASE TRANSFORMATIONS IN BEAM-BASED ADDITIVE MANUFACTURING OF TI-6AL-4V. 2013. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1377509936.

    MLA Style (8th edition)

  • Doak, Heather. "EFFECT OF PROCESS VARIABLES ON SUB-MELT THERMAL BEHAVIOR AND SOLID-STATE PHASE TRANSFORMATIONS IN BEAM-BASED ADDITIVE MANUFACTURING OF TI-6AL-4V." Master's thesis, Wright State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1377509936

    Chicago Manual of Style (17th edition)

wright1377509936
522
© 2013, some rights reserved.Creative Commons License EFFECT OF PROCESS VARIABLES ON SUB-MELT THERMAL BEHAVIOR AND SOLID-STATE PHASE TRANSFORMATIONS IN BEAM-BASED ADDITIVE MANUFACTURING OF TI-6AL-4V by Heather N Doak is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Wright State University and OhioLINK.