Microstructure Modeling of the Superalloy Ingot Breakdown Process

Abstract

A microstructure evolution model is presented, integrated into the Finite Element Modeling (FEM) software package DEFORM(tm). Recrystallization and grain growth, during and after thermomechanical deformation, are predicted via a phenomenologically-informed Cellular Automata (CA) algorithm. Strain, strain rate, and temperature are computed via FEM and provided as inputs to the model. Examples of a CA technique to predict microstructure evolution during cogging of a nickel base superalloy are presented. Although this model is focused on and will be validated for cogging of nickel base superalloy U720, it is designed to accommodate a range of alloys, thermomechanical processes, and other microstructure evolution algorithms, such as Monte Carlo (MC) and Phase Field (PF) methods as well.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2007
Accession Number
ADA469235

Entities

People

  • Alexander R. Bandar
  • Li Cai
  • Ravi Shankar
  • Wei-tsu Wu

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Algorithms
  • Energy
  • Geometry
  • Grain Boundaries
  • Grain Growth
  • Grain Size
  • Heat Treatment
  • Materials
  • Microstructure
  • Personal Information Managers
  • Phase Transformations
  • Recrystallization
  • Strain Rate
  • Superalloys
  • Temperature Gradients

Fields of Study

  • Materials science

Readers

  • Computational Fluid Dynamics (CFD)
  • Geochemistry
  • Powder metallurgy of Titanium alloys.