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VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Engineering Seminar: Twin-related Grain Boundary Engineering f
 or Laser Additive Manufacturing
X-WR-TIMEZONE:Central Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260612T200539Z
UID:tag:localist.com\,2008:EventInstance_52365443747439
DTSTART:20260403T160000Z
DTEND:20260403T170000Z
DESCRIPTION:Dr. Xiaoyuan Lou\, Associate Professor in School of Nuclear Eng
 ineering and School of Materials Engineering at Purdue University will giv
 e a seminar titled "Twin-related Grain Boundary Engineering for Laser Addi
 tive Manufacturing" to the interested faculty and students at Discovery Pa
 rk.\n\n \n\nAbstract\n\nLaser based additive manufacturing (AM)\, such as 
 laser powder bed fusion (L-PBF) and laser directed energy deposition (L-DE
 D)\, has enabled unprecedented flexibility in fabricating complex\, high
 ‑performance components\, but often produces heterogeneous grain structu
 res and non‑ideal grain boundary networks that limit the performance and
  reliability in service environments. In comparison\, coherent twin bounda
 ries offer greater thermal\, chemical and mechanical stabilities than disl
 ocation structures and random grain boundaries.  Twin boundaries have been
  demonstrated to offer better fatigue resistance\, corrosion/oxidation res
 istance\, creep resistance\, and less prone to detrimental GB precipitates
  under thermal aging. Conventional manufacturing of wrought products typic
 ally use the multi-step thermomechanical process to enable twin-related gr
 ain boundary engineering (GBE). However without complex thermomechanical t
 reatment\, a strategy to create high-density twin boundaries during laser 
 AM has not been established.\n\nThis talk will provide a broad overview of
  our continuing efforts to understand the formation mechanisms of twins un
 der rapid laser solidification and post-AM heat treatment. Attention will 
 be given to how process variables and alloy composition influence twin for
 mation and grain boundary character distributions. In particular\, the tal
 k will discuss the fundamentals of microstructure development related to t
 wo main strategies\, including (1) recrystallization-induced twinning\, (2
 ) phase transformation-induced twinning. We demonstrated for the first tim
 e that GBE of LPBF AM 316L SS\, with twin boundary fraction exceeding the 
 best practice of conventional GBE wrought 316L SS\, can be achieved.\n\n \
 n\nBio\n\nDr. Xiaoyuan Lou is an associate professor in School of Nuclear 
 Engineering and School of Materials Engineering at Purdue University. He e
 arned his Ph.D. in materials science and engineering from Georgia Institut
 e of Technology. Before joining Purdue\, he was an associate professor at 
 Auburn University and a lead material scientist at GE Global Research. Dr.
  Lou’s work involves understanding the damage and degradation mechanisms
  of metallic alloys in nuclear environments\, and developing advanced manu
 facturing methods and alloys for extreme environments. Dr. Lou was recogni
 zed with two times for “Best Paper Award” by Journal of Nuclear Materi
 als (2019\, 2023)\, "Top Cited Paper Award" by International Journal of Pl
 asticity\, three GE Corporate awards\, Outstanding Faculty Teaching Award 
 from Auburn University College of Engineering\, and Paul C. Zmola Scholar 
 of Nuclear Engineering Award from Purdue Nuclear Engineering.
GEO:33.253134;-97.148579
LOCATION:Discovery Park Building\, B155
SUMMARY:Engineering Seminar: Twin-related Grain Boundary Engineering for La
 ser Additive Manufacturing
URL;VALUE=URI:https://calendar.unt.edu/event/es-202604031100
CATEGORIES:Lectures & Speakers
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