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  • 1.
    Andersson, Magnus
    KTH, Superseded Departments, Materials Science and Engineering.
    Enthalphy change of the ε→γ transformation in Fe-Mn-Si alloys1997Report (Other academic)
  • 2.
    Andersson, Magnus
    KTH, Superseded Departments, Materials Science and Engineering.
    Thermal and stress induced gamma to epsilon martensitic transformations in Fe-Mn-Si shape memory alloys1997Doctoral thesis, comprehensive summary (Other scientific)
  • 3.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Forsberg, Annika
    KTH, Superseded Departments, Materials Science and Engineering.
    Ågren, John
    KTH, Superseded Departments, Materials Science and Engineering.
    Martensitic and magnetic transformations in Fe-Mn-Si shape memory alloys1993In: Transactions of the materials research society of Japan, 1993, p. 973-976Conference paper (Other academic)
  • 4.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Stalmans, Rudy
    Ågren, John
    KTH, Superseded Departments, Materials Science and Engineering.
    The Influence of External Stresses on the Transformation Behaviour in a Fe-Mn-Si Alloy1997In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 7, no C5, p. 411-416Article in journal (Refereed)
    Abstract [en]

    The influence of external stresses on the transformation behaviour has been studied for a polycrystalline Fe-3 IMn-SSi alloy exhibiting the y-+& martensitic transformation. Samples have been loaded at temperatures above the M, temperature, cooled with a constant external load to a temperature below the M, temperature and subsequently heated without load to a temperature above the A, temperature of the alloy. Stress, strain and temperature have been continuously measured and transformation temperatures and strains have been determined from the change in strain during the transformation. It has been found that the M, temperature during cooling with load is not influenced by 0.3-2 % plastic pre-deformation of the austenite whereas there is a substantial increase in the transformation strain, i.e. variants with a favourable orientation are enhanced by pre-strain of austenite.

  • 5.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Stalmans, Rudy
    Ågren, John
    KTH, Superseded Departments, Materials Science and Engineering.
    Unified thermodynamic analysis of the stress-assisted γ→ε martensitic transformation in Fe–Mn–Si alloys1998In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 46, no 11, p. 3883-3891Article in journal (Refereed)
    Abstract [en]

    A unified thermodynamic analysis has been developed which allows the combined complex effects of applied stresses and alloy composition on the martensite start temperature, Ms(σ), to be explained and predicted. In this unified analysis, a thermodynamic analysis of the effect of applied stress on the relative stability of the high and low temperature phase is combined with existing thermodynamic descriptions of the alloy system. The calculated results are compared with experimental results for the γ martensitic transformation in Fe–Mn–Si shape memory alloys. For single crystals, the comparison shows that the influence of applied stresses can be directly predicted with a reasonable accuracy for a wide composition range. By integrating a polycrystallinity parameter in the analysis it is shown that the calculations are also valid for polycrystalline alloys. Application of this analysis to experimental values of Ms(σ) can also generate useful data for future optimizations of the thermodynamic description of several alloy systems.

  • 6.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Van Humbeeck, Jan
    Ågren, John
    KTH, Superseded Departments, Materials Science and Engineering.
    Effects of recrystallization and grain size on the martensitic transformation in Fe-31% Mn-5% Si alloy1996In: Materials transactions, JIM, ISSN 0916-1821, Vol. 37, no 7, p. 1363-1370Article in journal (Refereed)
    Abstract [en]

    The effects of recrystallization and grain size have been studied in an Fe-31%Mn-5%Si shape memory alloy. The amount of martensite formed in samples which have been hot rolled at 1373 K and subsequently homogenized for 24 h at 1273 K followed by a final 30 min anneal at 1323 K is twice as large as in samples which have been hot rolled and homogenized in the same way as the former followed by a compression and a subsequent recrystallization at 1323 K for 30 min. The only difference between the samples is the plastic deformation induced by the compression. We thus conclude that some effect of the compressive deformation remains despite the recrystallization and suppresses the subsequent martensite formation. However, we have not yet been able to identify this effect. This matter will be subject to further investigations.

    No significant change is found in the M(S) and A(S) temperatures for the gamma <----> epsilon transformations determined by DSC. When the grain size varies between 40 and 160 mu m in completely recrystallized samples the variation in transformation temperatures is small, less than 10 K.

  • 7.
    Andersson, Magnus
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Ågren, John
    KTH, Superseded Departments, Materials Science and Engineering.
    Effect of Prestraining and Training on the γ→ε Transformation in Fe-Mn-Si Alloys1995In: Journal de Physique IV: Colloque, ISSN 1155-4339, E-ISSN 1764-7177, Vol. 5, no C8, p. 457-462Article in journal (Refereed)
    Abstract [en]

    The effect of training and predeformation on the martensitic transformation is investigated. It is concluded that MS as a function of predeformation strain must have a maximum at around 3% strain. Prestrains less than 5% will enhance the martensitic transformation whereas larger prestrains depress it due to strain hardening of the γ phase.

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