Bauschinger Effect in α-γ Dual Phase Alloys Studied by In Situ Neutron Diffraction

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Abstract

<i>In situ</i> neutron diffraction experiments during tension-compression deformation were performed on five Fe–Cr–Ni alloys with the volume fraction of ferrite (α) ranging from 0.0 to 100 %. Tensile deformation was applied in a step by step manner up to a strain of 1.3–2.0 % followed by compressive deformation, and neutron diffraction spectra were recorded during temporary stops of a deformation machine with fixed crosshead. (111) reflection of austenite and (110) of ferrite, respectively, were measured simultaneously by using a position sensitive detector. Elastic lattice strains in both constituent phases were evaluated from measured diffraction spectra as a function of external load. Based on these experimental results, heterogeneous deformation behavior in the α–γ dual phase alloys is discussed considering the Bauschinger effect. It is concluded that large compressive residual lattice strains detected in the γ phase after tensile pre-strain-ing, causes the large Bauschinger effect in α–γ dual phase alloys.

Journal

  • ISIJ International

    ISIJ International 42(5), 551-557, 2002-05-15

    The Iron and Steel Institute of Japan

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