Abstract
Neutron diffraction has been used to follow in situ the stress-induced martensitic transformation during uniaxial tensile testing of polycrystalline Fe-25 wt% Ni-0.4 wt% C. This method provides data on the extent of transformation, the development of crystallographic texture and the evolution of lattice strain. Two types of specimen were examined: unswaged, and swaged at 200 °C. The swaged material was further aged with greater yield strength, enhancing the transformation. Moreover, it exhibited a stronger texture than the unswaged material. The extent of the transformation is shown to be dependent on grain orientation, with austenite grains having 〈100〉 parallel to the tensile axis transforming preferentially. The internal stress state shows that, during plastic flow, the load is transferred from the original austenite to the evolving martensite phase.
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