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Efecto de la microestructura en la tenacidad al impacto en aceros de elevada resistencia mecánica

机译:显微组织对高机械强度钢冲击韧性的影响

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One of the major challenges in the development of new steel grades is to get increasingly high strength combined with a low ductile brittle transition temperature and a high upper shelf energy. This requires the appropriate microstructural design. Toughness in steels is controlled by different microstructural constituents. Some of them, like inclusions, are intrinsic while others happening at different microstructural scales relate to processing conditions. A series of empirical equations express the transition temperature as a sum of contributions from substitutional solutes, free nitrogen, carbides, pearlite, grain size and eventually precipitation strengthening. Aimed at developing a methodology that could be applied to high strength steels, microstructures with a selected degree of complexity were produced at laboratory in a Nb-microalloyed steel. As a result a model has been developed that consistently predicts the Charpy curves for ferrite-pearlite, bainitic and quenched and tempered microstructures using as input data microstructural parameters. This model becomes a good tool for microstructural design.
机译:开发新钢种的主要挑战之一是要获得越来越高的强度,同时还要具有低的韧性脆性转变温度和高的上层储能。这需要适当的微结构设计。钢的韧性是由不同的显微组织成分控制的。它们中的一些(如夹杂物)是固有的,而其他发生在不同微观结构尺度上的则与加工条件有关。一系列经验方程式将转变温度表示为置换溶质,游离氮,碳化物,珠光体,晶粒大小和最终析出强化的贡献之和。为了开发一种可应用于高强度钢的方法,实验室在铌微合金钢中生产了具有一定复杂度的微结构。结果,开发了一个模型,该模型使用输入数据的微结构参数来一致地预测铁素体-珠光体,贝氏体以及淬火和回火的微结构的夏比曲线。该模型成为微结构设计的良好工具。

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