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High Throughput Process-Materials Framework for Repairing Ni-Based Superalloys
High Throughput Process-Materials Framework for Repairing Ni-Based Superalloys
High Throughput Process-Materials Framework for Repairing Ni-Based Superalloys

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자료유형  
 학위논문 서양
최종처리일시  
20260202105505
ISBN  
9798263326265
DDC  
530.41
저자명  
Adapa, Venkata Surya Karthik Adapa.
서명/저자  
High Throughput Process-Materials Framework for Repairing Ni-Based Superalloys
발행사항  
[Sl] : Georgia Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
194 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Saldana, Christopher;Melkote, Shreyes.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2025.
초록/해제  
요약This dissertation presents a high-throughput experimental and data-driven modeling framework to guide the repair and design of Ni-based superalloys using directed energy deposition. By leveraging compositionally graded IN625-IN100 alloy mixtures, the study systematically investigates cracking, microstructure evolution, and mechanical performance across varied compositions and processing conditions. The rationale for blending these alloys lies in their differing concentrations of γ'-forming elements Al and Ti in IN625 and IN100, which enables tuning of the γ' volume fraction and thus the resulting mechanical behavior and crack susceptibility. A high-throughput design of experiments efficiently identified crack-prone regimes, revealing that crack susceptibility is strongly influenced by both composition and thermal boundary conditions, which vary with part geometry and inter-layer timing. To support process-structure analysis, CALPHAD-based thermodynamic simulations were used to estimate phase stability and γ' solvus behavior across the varied compositions.Recognizing the virtually limitless design space of compositional and processing combinations, this work employs machine learning models to predict mechanical properties based on alloy chemistry, processing conditions, and microstructural features. Small punch testing and SEM image analysis, coupled with advanced segmentation methods, provide high-throughput material data to train Gaussian Process Regression (GPR) models. Additionally, Principal Component Analysis (PCA) of in-situ thermal histories enabled interpretable classification of cracking behavior under different compositions and conditions. The resulting CPSP models capture latent thermal and microstructural descriptors that govern property variation, enabling real-time process optimization. Altogether, this framework supports scalable, physics-aware process mapping and lays the foundation for accelerated qualification of complex AM components.
일반주제명  
Solidification
일반주제명  
Motion control
일반주제명  
Powder metallurgy
일반주제명  
Energy
일반주제명  
Microstructure
일반주제명  
Scanning electron microscopy
일반주제명  
Raw materials
일반주제명  
Cooling
일반주제명  
Lasers
일반주제명  
Ductility
일반주제명  
Support vector machines
일반주제명  
Stainless steel
일반주제명  
Analytical chemistry
일반주제명  
Industrial engineering
일반주제명  
Materials science
일반주제명  
Optics
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aAdapa,  Venkata  Surya  Karthik  Adapa.
■24510▼aHigh  Throughput  Process-Materials  Framework  for  Repairing  Ni-Based  Superalloys
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a194  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Saldana,  Christopher;Melkote,  Shreyes.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2025.
■520    ▼aThis  dissertation  presents  a  high-throughput  experimental  and  data-driven  modeling  framework  to  guide  the  repair  and  design  of  Ni-based  superalloys  using  directed  energy  deposition.  By  leveraging  compositionally  graded  IN625-IN100  alloy  mixtures,  the  study  systematically  investigates  cracking,  microstructure  evolution,  and  mechanical  performance  across  varied  compositions  and  processing  conditions.  The  rationale  for  blending  these  alloys  lies  in  their  differing  concentrations  of  γ'-forming  elements  Al  and  Ti  in  IN625  and  IN100,  which  enables  tuning  of  the  γ'  volume  fraction  and  thus  the  resulting  mechanical  behavior  and  crack  susceptibility.  A  high-throughput  design  of  experiments  efficiently  identified  crack-prone  regimes,  revealing  that  crack  susceptibility  is  strongly  influenced  by  both  composition  and  thermal  boundary  conditions,  which  vary  with  part  geometry  and  inter-layer  timing.  To  support  process-structure  analysis,  CALPHAD-based  thermodynamic  simulations  were  used  to  estimate  phase  stability  and  γ'  solvus  behavior  across  the  varied  compositions.Recognizing  the  virtually  limitless  design  space  of  compositional  and  processing  combinations,  this  work  employs  machine  learning  models  to  predict  mechanical  properties  based  on  alloy  chemistry,  processing  conditions,  and  microstructural  features.  Small  punch  testing  and  SEM  image  analysis,  coupled  with  advanced  segmentation  methods,  provide  high-throughput  material  data  to  train  Gaussian  Process  Regression  (GPR)  models.  Additionally,  Principal  Component  Analysis  (PCA)  of  in-situ  thermal  histories  enabled  interpretable  classification  of  cracking  behavior  under  different  compositions  and  conditions.  The  resulting  CPSP  models  capture  latent  thermal  and  microstructural  descriptors  that  govern  property  variation,  enabling  real-time  process  optimization.  Altogether,  this  framework  supports  scalable,  physics-aware  process  mapping  and  lays  the  foundation  for  accelerated  qualification  of  complex  AM  components.
■590    ▼aSchool  code:  0078.
■650  4▼aSolidification
■650  4▼aMotion  control
■650  4▼aPowder  metallurgy
■650  4▼aEnergy
■650  4▼aMicrostructure
■650  4▼aScanning  electron  microscopy
■650  4▼aRaw  materials
■650  4▼aCooling
■650  4▼aLasers
■650  4▼aDuctility
■650  4▼aSupport  vector  machines
■650  4▼aStainless  steel
■650  4▼aAnalytical  chemistry
■650  4▼aIndustrial  engineering
■650  4▼aMaterials  science
■650  4▼aOptics
■690    ▼a0791
■690    ▼a0486
■690    ▼a0800
■690    ▼a0546
■690    ▼a0794
■690    ▼a0752
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360315▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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