rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Ferritic-martensitic steel subjected to equal channel angular extrusion
  name:
    name part: Foley, David Christopher.
    role:
      role term: creator
  name:
    name part: Hartwig, Karl Theodore
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2010
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: electronic
    form: remote
    extent: 1 online resource.
  abstract: Modified 9Cr-1Mo ferritic-martensitic steel (T91) has been extensively investigated as a structural material for GenIV nuclear reactors and Accelerator Driven Transmutation systems. One attractive characteristic of this steel in these applications is its superior radiation damage tolerance in comparison to typical austenitic stainless steels such as 316L. In some GenIV applications, it also has a significantly higher corrosion resistance. Further improvement of both is necessary if GenIV designs are to become commercially viable. Other work has shown an improvement in radiation damage tolerance via cold rolling or sputtering nanoscale multilayered films. Additionally, corrosion resistance can be improved by homogenizing the microstructure. Further, these changes can improve the strength of the material. However, there has been no fabrication of bulk ultra fine grain ferritic-martensitic steel candidates that might offer these avenues of improvement. This work demonstrates the refinement and homogenization of T91 by Equal Channel Angular Extrusion (ECAE) and heat treatment. Processing temperature and strain level were varied to produce multiple levels of refinement. Materials were characterized by microhardness, tensile testing, x-ray diffraction and transmission electron microscopy. An ultra-fine, highly misoriented and homogeneous microstructure was achieved in the material. Refinement was demonstrated both in ferritic and ferritic-martensitic compositions of the steel. Microhardness increased by as much as 70% and ultimate tensile strength by 80%. More significantly, tensile strength was improved by 40% without decreasing ductility.
  note: by David Christopher Foley.
  note: "Major Subject: Mechanical Engineering"
  note: Title from author supplied metadata (automated record created 2010-03-12 12:08:51).
  note: Electronic resource.
  note: Master of Science Texas A&M University 2007 http://hdl.handle.net/1969.1/ETD-TAMU-2537
  note: Includes bibliographical references.
  note: Text (Thesis)
  subject:
    topic: Major mechanical engineering
  subject:
    topic: T91
  subject:
    topic: ECAE
  subject:
    topic: 9Cr-1Mo
  subject:
    topic: ECAP
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2537
  record info:
    record content source: TXA
    record creation date: 100427
    record change date: 20151201120213.0
    record identifier: in00002578479