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首页> 外文期刊>Materials Science and Engineering >Effect of thermomechanical treatment and coiling temperature on the strengthening mechanisms of low carbon steels microalloyed with Nb
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Effect of thermomechanical treatment and coiling temperature on the strengthening mechanisms of low carbon steels microalloyed with Nb

机译：热机械处理和卷取温度对铌微合金化低碳钢强化机理的影响

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摘要

One of the options available for coping with current property requirements is to increase microalloying contents. As well as affecting austenite microstructural evolution, this can lead to a larger contribution of precipitation and dislocation density hardening to the mechanical strength. However, it also results in more complex interactions between the strengthening mechanisms, making it difficult to optimize operation parameters. In this work, plane strain compression tests were carried out to produce different austenite microstructures with two low carbon steels microalloyed with different Nb levels (0.0496 and 0.11%), followed by coiling simulations in the 500 to 700 ℃ temperature range. The mechanical properties of the transformed microstructures were determined via tensile testing and the specimens were characterized using optical microscopy, EBSD and TEM. Similar austenite grain sizes and strain accumulation levels were obtained for both steels, and as a result, it was observed that increasing Nb content had a small effect on the grain size of the transformed microstructures. On the other hand, the coiling temperature significantly affected the mechanical strength. The lowest strength values are obtained for 700 ℃; these increase significantly at 600 ℃ (s90 and 140 MPa increase in the Yield Strength (YS) for the low and high Nb steels, respectively) and decrease slightly at 500 ℃. At the conditions investigated, similar dislocation density levels were determined for both steels, which indicates that the larger YS increase observed for the high Nb steel must be mainly due to the effect of precipitates formed during or after phase transformation.
机译：满足当前性能要求的可用选项之一是增加微合金含量。除了影响奥氏体的微观结构演变之外，这还可能导致析出和位错密度变硬对机械强度的更大贡献。但是，这也会导致加强机制之间的相互作用更加复杂，从而难以优化操作参数。在这项工作中，进行了平面应变压缩试验，以使用两种具有不同Nb水平（0.0496和0.11％）的低合金钢生产出不同的奥氏体组织，然后在500至700℃的温度范围内进行卷取模拟。通过拉伸测试确定了转变后的微结构的机械性能，并使用光学显微镜，EBSD和TEM对样品进行了表征。两种钢都获得了相似的奥氏体晶粒尺寸和应变累积水平，结果发现，增加Nb含量对相变组织的晶粒尺寸影响很小。另一方面，卷取温度显着影响机械强度。最低强度值为700℃；这些在600℃时显着增加（低和高Nb钢的s90和140 MPa屈服强度（YS）分别增加），而在500℃时则略有降低。在研究的条件下，两种钢都确定了相似的位错密度水平，这表明高Nb钢观察到的更大的YS增加主要是由于在相变过程中或相变之后形成的析出物。

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