Abstract：The change of microstructure evolution，phase transformation and stress-strain redistribution of direction low-temperature bainite with stress conditions were analyzed using numerical simulation. Representative volume element （RVE） model was built up by the microstructure characteristics of low-temperature bainite observed through scanning electron microscope （SEM） and electron back-scattered diffraction （EBSD）. The stress-strain model of low-temperature bainite was developed through the ABAQUS user material subroutine VUMAT by introducing Serri-Cherkaoui martensite phase transformation criterion. The results show that the retained austenite in low-temperature bainite can effectively regulate the stress distribution in the micro-region during the deformation process. And the regulatory effect is related to the morphology and distribution of the residual austenite. The position of phase transformation is usually not uniform due to the complex distribution of stress in micro-region during the process of deformation. During the entire deformation，the bainite matrix change from the relative ‘hard’ phase to the relative ‘soft’ phase，and the stress distribution of bainite matrix changes greatly with the transformation of retained austenite changes.
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