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Effects of stress on martensitic transformation in ferrous alloys. Experiments and numerical simulations

机译：应力对黑色合金中马氏体转化的影响。实验和数值模拟

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Experimental results are presented showing that applied stresses modify the transformations kinetics, the mechanical behaviour as well as the martensite morphology. These modifications are significant when the stress is larger than a threshold stress. The occurrence of a threshold stress is related to a change in the accommodation mechanism of the transformation strains, going from the formation of self-accommodating plates to accommodation by plastic slip in the parent phase. In order to further analyse the experimental results numerical simulations were performed using a 2D finite element micromechanical model. The martensite plate formation was modelled, and the choice of the plate orientation was defined considering a transformation criterion. The mechanical behaviour of the phases was considered either elastic or elasto-plastic. For no applied stress, the results show that self-accommodating arrangements are formed to relax the internal stresses whatever the mechanical behaviour. When increasing the applied stress, the occurrence of transformation strain accommodation by plastic yielding limits the role of the internal stresses, allowing favourable plate orientation. However the contribution of plastic yielding to the total deformation in the stress direction is low as compared to the deformation associated with the transformation.
机译：提出了实验结果表明，施加的应力改变转化动力学，机械行为以及马氏体形态。当应力大于阈值应力时，这些修改很大。阈值应力的发生与变换菌株的容纳机构的变化有关，从形成自容纳板以通过母相中的塑料滑移到容纳。为了进一步分析实验结果，使用2D有限元微机械模型进行数值模拟。模拟马氏体板形成，考虑转化标准定义了板取向的选择。各相的力学行为被认为是弹性或弹性塑料。对于没有施加的应力，结果表明，无论机械行为如何，都形成自适应布置以松弛内部应力。当增加施加的应力时，通过塑料产生转化应变容纳的发生限制了内部应力的作用，允许良好的板取向。然而，与与转化相关的变形相比，应力方向上的塑料的总变形的贡献低。

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