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DESCRIPTION:Benjamin Brown\, a doctoral candidate in mechanical engineering
 \, will defend their dissertation titled “Process-Structure-Property Relati
 onships in Laser Powder Bed Fusion Produced 17-4 PH Steel.” Their advisor\,
  Dr. Frank Liou\, is a professor in the mechanical and aerospace engineerin
 g department and director of the manufacturing engineering program. The dis
 sertation abstract is provided below. \n\nLaser powder bed fusion (LPBF) is
  a metal additive manufacturing method that produces non-traditional micros
 tructures as a result of the rapid solidification and thermal cycling inher
 ent to the process. When using LPBF-produced material in application\, thes
 e unique microstructures challenge the applicability of well developed mech
 anical property databases achieved by conventional heat treatments. For wid
 er adoption of this technology\, a more holistic understanding is necessary
  on how process attributes develop material structure\, which dictate mecha
 nical properties. This dissertation explores the process structure-property
  relationships in LPBF 17-4 PH steel through systematic evaluation of atmos
 pheric processing and heat treatment effects on microstructure and mechanic
 al performance. Specimens were fabricated under controlled build environmen
 ts\, subjected to a range of solutionizing\, homogenizing\, and aging treat
 ments\, and characterized using optical microscopy\, electron back scatter 
 diffraction (EBSD)\, and X-ray diffraction (XRD) to quantify phase evolutio
 n. Tensile testing was performed to directly link heat treatment pathway an
 d nitrogen absorption to mechanical performance. This work demonstrates whe
 re conventional heat treatment standards are applicable to LPBF 17-4 PH ste
 el and where modifications are required. By directly correlating phase stab
 ility\, nitrogen effects\, and tensile response\, this work provides practi
 cal guidelines for tailoring post-processing strategies. These findings und
 erscore that successful application of LPBF 17-4 PH steel requires explicit
  consideration of both build environment and post-processing. By linking pr
 ocessing conditions to microstructure and performance\, this work advances 
 understanding of critical variables that govern reliability of additively m
 anufactured precipitation-hardened stainless steels in demanding applicatio
 ns.
DTEND:20251104T230000Z
DTSTAMP:20260420T194242Z
DTSTART:20251104T210000Z
GEO:37.954213;-91.774099
LOCATION:Toomey Hall\, 144
SEQUENCE:0
SUMMARY:Final Doctoral Defense for Benjamin Brown
UID:tag:localist.com\,2008:EventInstance_51029141802744
URL:https://calendar.mst.edu/event/final-doctoral-defense-for-benjamin-brow
 n
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