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首页> 外文期刊>Journal of Materials Engineering and Performance >Enhancing Mechanical Properties of Hot Wrought Steel by Microalloying and Optimizing Heat Treatments
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Enhancing Mechanical Properties of Hot Wrought Steel by Microalloying and Optimizing Heat Treatments

机译：通过微合金化和优化热处理来提高热锻钢的机械性能

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Novel methods to increase performance of steels without increasing production costs are always sought after. In this study, a chemistry-process-structure-property paradigm was employed to modify rolled homogeneous armor (RHA) steels that contain no nickel (Ni) or chromium (Cr) and instead, microalloying with niobium (Nb). Characterization of 0.02 and 0.05 wt.% Nb additions was targeted in tandem with optimized heat treatments to improve performance without detrimentally increasing carbon equivalence. Designed alloys were cast in a vacuum induction melting furnace and thermo-mechanically processed. Optimal heat treatment conditions were determined with computational simulation software, JMatPro, for materials properties, which resulted in an exploration of three tempering temperatures, 400, 500, and 600 degrees C. Microstructures were investigated by optical and electron microscopy, where Nb additions were determined to reduce average grain area of ferrite, bainite, and martensite by as much as 75, 59, and 58%, respectively. Hardenability was characterized by Jominy end-quench testing and showed a slight increase in average hardness for Nb-bearing alloys due to the precipitation of NbC. Compression and tension tests revealed minimal strain rate sensitivity and a nearly 30% increase in strength in comparison with reference RHA materials. Impact tests showed a moderate increase in energy absorption of up 61%. Fractography of the failed specimens highlighted MnS precipitates as well as NbC and Mo2C carbides. Overall, results showed small (<= 0.05 wt.%) additions of Nb accompanied by an optimized heat treatment resulted in a modified, less-expensive RHA with similar performance to typical Ni/Cr-RHA.
机译：始终追捧了在不增加生产成本的情况下增加钢材性能的新方法。在该研究中，采用化学过程 - 结构 - 性质范式来改变含有镍（Ni）或铬（Cr）的卷起的均匀铠装（rha）钢，并代替微合金化与铌（Nb）。表征0.02和0.05重量％。％Nb添加靶向串联，具有优化的热处理，以改善性能而不会受到碳当量的不利增加。设计的合金铸造在真空感应熔炉中并热机械加工。利用计算模拟软件测定最佳热处理条件，JMATPRO用于材料性质，导致探测三次的回火温度，400,500和600℃。通过光学和电子显微镜研究微观结构，确定了Nb添加以减少铁素体，贝氏体和马氏体的平均谷物面积，分别多达75,59和58％。通过Jominy终骤冷试验表征淬透性，并且由于NBC的沉淀而显示出Nb轴承合金的平均硬度略微增加。压缩和张力试验显示最小的应变速率灵敏度，与参考RHA材料相比，强度升高近30％。冲击试验表明能量吸收增长61％的温和性增加。失败的标本的Fractography突出显示MNS沉淀物以及NBC和MO2C碳化物。总体而言，结果表明，Nb添加的小（<= 0.05重量％）伴随着优化的热处理，导致改性，较少昂贵的RHA，其具有与典型的Ni / Cr-rha相似的性能。

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