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    Controlling Phase Composition in Selective Laser Melted Stainless Steels

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    2012-33-Starr.pdf (564.9Kb)
    Date
    2012-08-22
    Author
    Starr, Thomas L.
    Rafi, Khalid
    Stucker, Brent
    Scherzer, Christopher M.
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    Abstract
    Commercially important stainless steels can be austenitic or martensitic and this phase composition fundamentally controls the mechanical properties of the material. With selective laser melting (SLM), 17-4 stainless steel can be produced in either phase depending on powder composition, SLM conditions and post-build heat treatment. This behavior is examined using optical and electron microscopy and high temperature x-ray diffraction in order to better understand the formation of metastable austenite and its transformation to martensite. Control of phase composition can produce a material with either extremely large strain-to-failure or high yield strength and can provide a method for completely eliminating residual stress.
    Department
    Mechanical Engineering
    Subject
    selective laser melting
    stainless steels
    phase composition
    URI
    https://hdl.handle.net/2152/88426
    http://dx.doi.org/10.26153/tsw/15363
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