薄规格取向硅钢中晶粒取向和尺寸对Goss晶粒异常长大的影响

利用EBSD技术统计了薄规格取向硅钢片中初次再结晶和二次再结晶前期组织中{411}〈148〉、{111}〈112〉、{100}〈025〉取向晶粒尺寸分布,分析了三种不同取向的晶粒对Goss晶粒异常长大的影响。结果表明:初次再结晶组织中不同的取向晶粒对应的平均晶粒尺寸(d)存在差异,{411}〈148〉取向晶粒的平均尺寸最大,其次为{100}〈025〉取向晶粒,{111}〈112〉取向晶粒的平均尺寸最小。Goss取向晶粒异常长大的过程中优先吞噬{111}〈112〉取向晶粒,其次是{411}〈148〉取向晶粒,最后是近{100}〈025〉取向晶粒和近黄铜取向晶粒。{111}〈112〉、{411}〈148〉取向晶粒对Goss取向晶粒异常长大的影响主要体现在二次再结晶的前期。因此,可以推断取向硅钢中最终残留的"岛晶"可能来源于近黄铜取向晶粒或近{100}〈025〉取向晶粒。

Effect of Recrystallized Grain Sizes and Orientations on Abnormal Growth of Goss-oriented Grains in Thin-gauge Grain-oriented Silicon Steel

The grain size distributions of {411}<148>,{111} <112> and {100} <025> in primary recrystallized and secondary recrystallized specimens in TG-CRGO steel were investigated by EBSD technique,and the effects of these three kinds of primary recrystallized grains on abnormal growth of Goss grains were analyzed.The results show that in primary recrystallized specimens,the average grain size order from large to small is { 411 } <148 >,{ 100 } <025> and { 111}<112> grains.The abnormal growth process of the Goss grains could be extracted as follows:the { 111} <112> grains are preferentially swallowed,then the { 411} <148> grains,and finally near the { 100 } < 025 > grains and near the Brass grains.{ 411 } < 148 > and { 111 } <112> grains would hinder the abnormal growth of Goss grains at preliminary stage.Therefore,it could be assumed that the residual island grains after final annealing mainly came from near { 110 } <112> grains or near { 100 } grains.