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首页> 外文期刊>Ultramicroscopy >Atomic scale investigation of non-equilibrium segregation of boron in a quenched Mo-free martensitic steel
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Atomic scale investigation of non-equilibrium segregation of boron in a quenched Mo-free martensitic steel

机译：无钼马氏体淬火钢中硼非平衡偏析的原子尺度研究

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B-added low carbon steels exhibit excellent hardenability. The reason has been frequently attributed to B segregation at prior austenite grain boundaries, which prevents the austenite to ferrite transformation and favors the formation of martensite. The segregation behavior of B at prior austenite grain boundaries is strongly influenced by processing conditions such as austenitization temperatures and cooling rates and by alloying elements such as Mo, Cr, and Nb. Here an local electrode atom probe was employed to investigate the segregation behavior of B and other alloying elements (C, Mn, Si, and Cr) in a Cr-added Mo-free martensitic steel. Similar to our previous results on a Mo-added steel, we found that in both steels B is segregated at prior austenite grain boundaries with similar excess values, whereas B is neither detected in the martensitic matrix nor at martensite-martensite boundaries at the given cooling rate of 30 K/s. These results are in agreement with the literature reporting that Cr has the same effect on hardenability of steels as Mo in the case of high cooling rates. The absence of B at martensite-martensite boundaries suggests that B segregates to prior austenite grain boundaries via a non-equilibrium mechanism. Segregation of C at all boundaries such as prior austenite grain boundaries and martensitemartensite boundaries may occur by an equilibrium mechanism. (C) 2015 Elsevier B.V. All rights reserved.
机译：含B的低碳钢具有出色的淬透性。原因通常归因于先前奥氏体晶界处的B偏析，这阻止了奥氏体向铁素体的转变并有利于马氏体的形成。 B在先前奥氏体晶界处的偏析行为受到奥氏体化温度和冷却速率等加工条件以及诸如Mo，Cr和Nb等合金元素的强烈影响。在这里，使用局部电极原子探针来研究B和其他合金元素（C，Mn，Si和Cr）在添加Cr的无Mo马氏体钢中的偏析行为。与我们先前对添加钼的钢的研究结果相似，我们发现两种钢中的B均偏析在先前的奥氏体晶界处，且具有相似的超值，而在给定的冷却条件下，既未在马​​氏体基体中也未检出B速率为30 K / s。这些结果与文献报道一致，即在高冷却速率下，Cr与Mo对钢的淬透性具有相同的影响。马氏体-马氏体边界处不存在B，这表明B通过非平衡机制偏析到先前的奥氏体晶界。在所有边界（例如，先前的奥氏体晶粒边界和马氏体马氏体边界）处的C偏析都可能通过平衡机制发生。 （C）2015 Elsevier B.V.保留所有权利。

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