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The sensitivity of the microstructure and properties to the peak temperature in an ultrafast heat treated low carbon-steel

机译：超快热处理低碳钢的组织和性能对峰值温度的敏感性

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摘要

In this work, we investigate the sensitivity of the microstructure and mechanical properties of an ultrafast heat treated low carbon-steel to the peak temperature. In all studied cases, the steel was heated within the intercritical temperature range (i.e. between the A_(C1) and A_(C3) temperatures). Both the peak temperature and soaking time were varied, and their effect on the size, the fraction of individual microstructural constituents and their tensile mechanical response were investigated. It is shown that the increasing peak temperature and soaking time promote austenite formation and recrystallization processes in the ferritic matrix. The highest nanohardness is shown by martensitic grains, while recovered ferrite demonstrated slighdy higher nanohardness compared to recrystallized ferrite. The applied heat treatment parameters have a strong effect on the nanohardness of martensite, whereas the nanohardness of ferrite microconstituents is not sensitive to variations of peak temperature and soaking time. The non-recrystallized ferrite is harder than its recrystallized counterpart due to the higher dislocation density of the former. Increasing peak temperatures promote strengthening in the material at the expense of its ductility mainly due to increased martensite fraction. The steel demonstrates enhanced strain hardening ability independently of the peak temperature. Analysis of the experimental results showed that the industrial processing window of ±10 ℃ may lead to some heterogeneity of the local microstructure in the ultrafast heat treated sheets. However, the latter should not have any negative effect on the overall mechanical behavior of the ultrafast heat treated steel sheets on the macro-scale.
机译：在这项工作中，我们研究了超快热处理低碳钢对峰值温度的组织和力学性能的敏感性。在所有研究的情况下，钢都在临界温度范围内（即A_（C1）和A_（C3）温度之间）加热。峰值温度和均热时间均发生变化，并且研究了它们对尺寸，单个微结构成分的分数及其拉伸机械响应的影响。结果表明，峰值温度和保温时间的增加促进了铁素体基体中奥氏体的形成和再结晶过程。马氏体晶粒显示出最高的纳米硬度，而与再结晶的铁素体相比，回收的铁素体显示出更高的纳米硬度。施加的热处理参数对马氏体的纳米硬度有很大影响，而铁素体微成分的纳米硬度对峰值温度和保温时间的变化不敏感。未重结晶的铁素体比重结晶的铁素体硬，这是因为前者的位错密度更高。峰值温度的升高主要由于马氏体分数的增加而以延展性为代价来促进材料的增强。该钢具有与峰值温度无关的增强的应变硬化能力。对实验结果的分析表明，±10℃的工业加工窗口可能会导致超快热处理板材中局部微观结构的异质性。但是，后者在宏观上不应对超快热处理钢板的整体机械性能产生任何负面影响。

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