Volume 8, Issue 4 (April 2011)

    Heat Treatments of Fe-Mn-Si Based Alloys: Mechanical Properties and Related Shape Memory Phenomena

    (Received 21 September 2010; accepted 21 March 2011)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    Heat treatments are usual means for modifying alloy microstructures and, consequently, to control mechanical properties. The aim of this work was to find suitable processes for improving the shape memory effect (SME) of Fe–Mn–Si-based alloys. In particular, we studied mechanisms that affect the plastic deformation of the austenite phase. A Fe–15Mn–5Si–9Cr–5Ni alloy was deformed by rolling at different temperatures and subsequently annealed at recovery- and recrystallization-temperature. The mechanical properties of the material after processing were evaluated by performing tension and flexure tests. The SME of room temperature deformed specimens was measured after heating them to 550°C for shape recovery. We found that the material rolled at 800°C followed by an annealing treatment at 650°C recovers nearly 95 % of a 3 % deformation. In this thermo-mechanical condition, the material has a yield stress of 450 MPa and an ultimate tensile strength of 880 MPa, corresponding to a total elongation of about 16 %. Optical and electron microscopy observations show that the matrix annealed at high temperature contains a low density of defects. As a consequence, there are fewer nucleation sites for martensite and the associated SME is low. On the other hand, annealing at intermediate temperatures (around 650°C) produces a favorable structure containing a large density of stacking faults.


    Author Information:

    Druker, A.
    Facultad de Cs. Ex., Ingeniería y Agrimensura (UNR), Rosario,

    Perotti, A.
    Facultad de Cs. Ex., Ingeniería y Agrimensura (UNR), Rosario,

    Baruj, A.
    Centro Atómico Bariloche e Instituto Balseiro, San Carlos de Bariloche,

    Malarría, J.
    IFIR, CONICET-Univ. Nacional de Rosario, Rosario,


    Stock #: JAI103399

    ISSN: 1546-962X

    DOI: 10.1520/JAI103399

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    Author
    Title Heat Treatments of Fe-Mn-Si Based Alloys: Mechanical Properties and Related Shape Memory Phenomena
    Symposium 18th IFHTSE Congress, 2010-07-26
    Committee A01