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首页> 外文期刊>ISIJ international >Decarburization Kinetics during Annealing of a Semi-processed Electrical Steel
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Decarburization Kinetics during Annealing of a Semi-processed Electrical Steel

机译：半加工电工钢退火过程中的脱碳动力学

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摘要

Semi-processed, non-oriented electrical steels used in motor and transformer cores have their magnetic properties optimized by means of a heat treatment performed under a moistened nitrogen atmosphere containing small amounts of hydrogen. The oxidation of carbon on the steel surface by the oxidizing gases present in this atmosphere decreases the carbon content of the steel. The consequent reduction in the amount of soluble carbon and in the volume fraction of carbides reduces magnetic losses and the susceptibility of the steel to magnetic aging. In this work, a cold-rolled, semi-processed electrical steel was submitted to six thermal treatments covering the most usual conditions employed in industry, combining two types of atmosphere (mixtures of nitrogen with 5 percent and 10 percent H_2) and three dew points (10, 20 and 30 deg C). The treatments were carried out in a pilot electrical oven especially adapted to simulate the thermal cycle and the moistened atmospheres employed in industry. The results obtained show that, at the beginning of the process, the decarburization rate is controlled by the chemical reaction of carbon on the steel surface. Later, an oxide layer may build up, depending on the humidity level of the atmosphere, reducing the rate of decarburization.
机译：通过在含少量氢的潮湿氮气气氛下进行热处理，优化了用于电机和变压器铁芯的半加工无取向电工钢的磁性能。在该气氛中存在的氧化气体在钢表面上的碳氧化会降低钢的碳含量。结果减少了可溶性碳的量和碳化物的体积分数，从而减少了磁损耗和钢对磁老化的敏感性。在这项工作中，对冷轧，半加工电工钢进行了六种热处理，涵盖了工业上最常用的条件，将两种类型的气氛（氮与5％和10％的H_2的混合物）和三个露点结合在一起（10、20和30摄氏度）。这些处理是在中型电烤箱中进行的，该电烤箱特别适合模拟工业中使用的热循环和潮湿的气氛。所得结果表明，在工艺开始时，脱碳速度受钢表面碳的化学反应控制。之后，根据大气的湿度水平，可能会形成氧化层，从而降低脱碳速度。

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