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首页> 外文期刊>Materials Science and Engineering >Effects of prior austenite grain size and phase transformation temperature on bainitic ferrite formation in multi-constituent microstructures of a strong ultra-low-carbon steel
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Effects of prior austenite grain size and phase transformation temperature on bainitic ferrite formation in multi-constituent microstructures of a strong ultra-low-carbon steel

机译：先前奥氏体晶粒尺寸和相变温度对强超低碳钢多构成微观结构伯氏体铁氧体形成的影响

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摘要

Bainitic ferrite is a key microstructural constituent in High-Strength Low-Alloy (HSLA) steels, influenced by the prior austenite grain size and heat treatment conditions. This study investigates the decomposition of coarse- and fine-grained austenite under rapid step quenching heat treatments around the martensite-start (M_s) temperature in an ultra-low-carbon HSLA steel. An isothermal-to-nonisothermal transition occurred in the austenite phase transformation behavior after the grain size refinement from～69 μm to ～10 μm resulting in the formation of a complex combination of various ferritic products consisting of quasi-polygonal ferrite, granular bainite, bainitic ferrite, and martensite in the microstructure of the below-M_s-treated samples. Fine bainitic ferrite laths with an average thickness of ～150 nm formed, which were about 70% thinner than those of the above-M_s-treated samples, contributing in part to an ultimate tensile strength of 791 MPa along with a uniform elongation of 6.4% for the below-M_s-treated samples. The results can give insight into the methodologies for transferring the concept of nanoscale bainite to ultra-low-carbon steels.
机译：贝氏体铁氧体是高强度低合金（HSLA）钢的关键微观结构构成，受先前奥氏体粒度和热处理条件的影响。该研究在超低碳HSLA钢中的马氏体开始（M_S）温度周围的快速步骤淬火热处理中研究了粗细胞和细粒淀粉酸盐的分解。在晶粒尺寸细化到从〜69μm至〜10μm的静脉内转换行为中发生等温到非变化的转变，从而形成由各种铁素体，粒状贝氏体，贝氏体组成的各种铁素体产品的复合组合铁氧体和马氏体在低于M_S处理的样品的微观结构中。平均厚度为〜150nm的细贝氏体铁氧体板条，其比上述样品的样品更薄约70％，部分促进791MPa的最终拉伸强度，均匀伸长率为6.4％对于以下M_S处理的样品。结果可以深入了解将纳米型贝氏体概念转移到超低碳钢钢的方法。

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