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首页> 外文期刊>Journal of Materials Engineering and Performance >Characteristics of steels in annealing combined with hot-rolling preheating
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Characteristics of steels in annealing combined with hot-rolling preheating

机译：退火与热轧预热相结合的钢的特性

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摘要

The rates of transformation and the morphologies after full annealing and industrial rolling without reheating were determined to establish the degree of similarity. Steels with 0.1–1% C and almost nil to 17% alloying addition (M2 steel) were isothermally transformed in a dilatometer after various thermomechanical processing (TMP) sequences. For annealing, the heat treatment was performed at about 880 °C, depending on C content, and then cooled for transfer to the dilatometer. In some cases, specimens were rolled to 50% reduction in 3 passes before cooling. The rolling schedule was simulated by preheating to 1150 °C followed by slow cooling to 950 °C for finish rolling as above before transfer to the dilatometer. Some specimens were directly cooled to transformation. The high preheat thoroughly homogenized the austenite (except for the M2 steel) and slowed the transformation by a factor >10 as the alloying content rose. In all cases, the hot rolling accelerated the transformation. After the high preheat the rate and microstructure were restored to those of standard annealing for hypo-eutectoid and M2 steel.
机译：确定完全退火和工业轧制而无需再加热后的相变速率和形态，以建立相似度。经过各种热机械加工（TMP）顺序后，在膨胀计中等温转变具有0.1–1％C和几乎为零至17％合金添加量的钢（M2钢）。为了退火，根据C含量在约880℃下进行热处理，然后冷却以传递至膨胀计。在某些情况下，冷却前3道次将试样轧制至50％的压下率。通过预热至1150°C，然后缓慢冷却至950°C以进行上述精轧来模拟轧制计划，然后转移至膨胀计。将一些标本直接冷却至相变。较高的预热使奥氏体（M2钢除外）充分均质化，并且随着合金含量的增加，相变速度降低了10倍以上。在所有情况下，热轧均可加速转变。经过高预热后，次共析和M2钢的速度和组织恢复到标准退火的水平。

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