本文研究了钢中Al含量对晶粒取向3％Si-Fe磁性的显著影响。用氢抽取法测定了钢中固溶氮及化合氮,结果表明:有效抑制初次晶粒正常长大的AlN量随钢中Al含量的变化而显著不同,酸溶铝量为0.005—0.02％时(N～0.007％),析出的有效AlN量最高。考虑到最佳磁性所对应的酸溶铝量的范围,则不难明白,钢中的Al主要是通过形成AlN抑制相而对成品磁性产生影响。
Studies were made of the effect of A1 on the magnetic properties of grainoriented 3%Si-Fe containing about 0.007 wt-% N and 0.001—0.0088 wt-% A1. The nitrogen content, both soluted and combined in steels were determined by hydrogen extracting method. It is shown that every optimum range of A1 content in steels is available to its own soaking temperature for the purpose of obtaining proper magnetic properties as B_(10)≥1.8T and P15/50≤1.05W/kg, such as 0.008—0.018, 0.005—0.022, 0.004—0.03 and 0.05 wt-% A1 correspond 1200, 1250, 1300 and 1350℃ respectively. If any A1 content was beyond the optimum range, their magnetic properties would be steeply fallen to such extent even as a value of the non-oriented steel. It is also found that the A1 content influences markedly upon the proportion of A1N which is an effective inhibitor to normal grain growth.Most effective A1N may be precipitated while the acid soluble A1 is within 0.005—0.02%. Owing to the aforementioned results together with that of electron microscope observation and thermodynamical consideration of A1N and MnS, an approach about the behaviour of A1 on magnetic properties of grain-oriented 3%Si-Fe was proposed, namely, the Al is associated with N to form AlN, and then A1N exists as an effective inhibitor.
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