锰含量对无取向硅钢夹杂物析出的影响在线观察

In-situ Observation of Non-metallic Inclusion Precipitation in Non-ori ented Silicon Steel with Different Manganese Concentrations

借助高温激光共聚焦显微镜,在线观察了不同Mn含量下无取向硅钢试样中的夹杂物析出、变化情况。结果表明,Mn含量为0.77%、0.32%时,对应试样的夹杂物数量分别为1 000万个/mm3、1 600万个/mm3。其中,0.77%Mn含量试样,夹杂物在1 115~1 098℃、1 068~1 032℃析出;0.32%Mn含量试样,夹杂物在1 086~1 068℃析出。0.77%Mn含量试样,优先析出球形、椭球形Mn S夹杂,其析出夹杂数量较少,尺寸较大,能有效抑制Al N、CuxS夹杂析出;0.32%Mn含量试样,优先析出相当数量Mn S夹杂,并作为Al N夹杂析出核心,形成Mn S＋Al N复合夹杂。这种复合夹杂物数量较多,尺寸也较大。

Based on the high temperature optical microscope, in-situ observation on precipitation of non- metallic inclusion in non-oriented silicon steel with different manganese concentration had been carried out. The observation showed that the numbers of non-metallic inclusions was 1 000×10^4/mm3 and 1 600×10^4/ mm3 when the manganese concentration was 0.77% and 0. 32%, respectively. The precipitation temperature range of non-metallic inclusions was from 1 115℃to 1 098 ℃and from 1 068℃ to 1 032 ℃for 0.77% manganese concentration, and was from 1 086 ℃ to 1 068℃ for 0.32% manganese concentration. For the 0.77% manganese concentration the spherical and elliposidal MnS will precipitate first, with small quantity and large size, can retard the precipitation of AlN and CusS effectively; on the other hand, MnS will precipitate first and can be adopted as the core of AlN, and form the composition of MnS and AlN during the reheating and cooling processes, which is more and larger for 0.32% manganese concentration.