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通过对纵剖电渣钢锭各部位Al的分析和应用离子探针作微区分析,探索了结构钢宏观和微观Al的不均匀性及其对奥氏体晶粒度的影响。电渣钢锭Al的宏观不均匀度(Al%max/Al%min)可达31;电渣钢材微区Al的不均匀度可达2.5。在一定的热加工条件下,只有在钢中各部分都有适当含量,而且在微区也均匀分布时,Al才能显示出阻止奥氏体晶粒粗化的作用。为了达到这一目的,必须在电渣冶炼中补充足够的Al,热加工中必须,而且只须有一次足够温度的加热(≥1230℃)。为了反映电渣钢锭Al含量的真实性,建议同时考核钢锭头、尾中心部位的Al含量。电弧炉下注钢锭Al的宏观偏析程度较小,但也应在加热中减轻微区Al的不均匀性。
Based on the analysis of Al in the longitudinal section of the electroslag ingot and the ion probe microanalysis, the inhomogeneity of macro and micro Al in structural steel and its influence on the grain size of austenite were explored. The macro-inhomogeneity (Al% max / Al% min) of Al in electroslag steel ingot can reach 31, and the non-uniformity of Al in electroslag steel can reach 2.5. Under certain hot working conditions, Al only shows the effect of preventing the austenite grain coarsening only when the appropriate content is present in all parts of the steel, and also uniformly distributed in the micro zone. In order to do this, it is necessary to add enough Al in the electroslag smelting, which is necessary for thermal processing, and only requires a sufficient temperature for heating (≥1230 ° C). In order to reflect the authenticity of the Al content in the electroslag steel ingot, it is suggested that the Al content in the head and tail center of the ingot be evaluated at the same time. The segregation degree of Al in EAF is smaller, but the heterogeneity of Al in the micro-zone should also be relieved during heating.