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首页> 外文期刊>ISIJ international >Effect of Equalisation Time on the Austenite Grain Size of Simulated Thin Slab Direct Charged (TSDC) Vanadium Microalloyed Steels
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Effect of Equalisation Time on the Austenite Grain Size of Simulated Thin Slab Direct Charged (TSDC) Vanadium Microalloyed Steels

机译：均化时间对模拟薄板坯直充钒微合金钢奥氏体晶粒尺寸的影响

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The thin slab direct charging process (TSDC) as applied to microalloyed steels has had a considerable development due to its relatively low production costs and ability to produce steels with good mechanical and toughness properties, comparable to those manufactured by the conventional cold charging process (CCC). This research is concerned with the effect of equalisation time on the microstructures. Three equalisation times (53 min, 318 min, and 1333 min) at 1150 deg C were investigated for a vanadium microalloyed steel, which contained a low carbon content (0.073 wt percent) and a high nitrogen content (0.021 wt percent). The experimental results show that MnS precipitates provided the main pinning forces during casting due to the high solubility temperature, but MnS particles did not provide a sufficient pinning force to prevent the austenite grains from growing. The austenite grain growth appears more likely to be abnormal in this stage. AlN precipitates were only identified at the longest equalisation time due to a low precipitation rate. The AlN pinning effect was evident at 1333 min equalisation time, and was able to prevent further austenite grain growth by providing an additional pinning force. The study shows that vanadium does not have any effect on austenite grain growth at 1150 deg C because of its low solubility temperature in austenite. When the steel was water-quenched, vanadium remained supersaturated in the solution but tempering in the ferrite phase field (650 deg C) can promote VN or VCN precipitation often using AlN as the nuclei.
机译：用于薄合金的薄板坯直接装料工艺（TSDC）由于其相对较低的生产成本和生产具有良好机械和韧性性能的钢的能力而取得了长足的发展，与传统的冷装工艺（CCC）相比）。这项研究涉及均衡时间对微观结构的影响。研究了钒微合金钢在1150℃时的三个均化时间（53分钟，318分钟和1333分钟），该钢含碳量低（0.073重量％）和氮含量高（0.021重量％）。实验结果表明，由于高溶解温度，MnS析出物提供了主要的钉扎力，但MnS颗粒却不能提供足够的钉扎力来阻止奥氏体晶粒的生长。在此阶段，奥氏体晶粒的生长似乎更可能异常。由于沉淀速率低，仅在最长的均衡时间才能识别出AlN沉淀。 AlN钉扎效应在1333分钟的均衡时间很明显，并且能够通过提供额外的钉扎力来防止奥氏体晶粒的进一步生长。研究表明，钒在1150℃下对奥氏体晶粒的生长没有任何影响，因为钒在奥氏体中的溶解度较低。对钢进行水淬后，钒在溶液中保持过饱和，但在铁素体相场（650℃）中回火通常可以使用AlN作为核来促进VN或VCN沉淀。

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