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首页 > 过刊浏览>2018年第41卷第8期 >34-43. DOI:10.11835/j.issn.1000-582X.2018.08.005
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无取向硅钢中含镁夹杂物的形成机理分析
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中图分类号:

TF557

基金项目:

国家自然科学基金项目（No.51674180）。


Formation mechanism analysis on magnesium-bearing inclusions in non-oriented silicon steels
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    摘要:

    通过取样检测和热力学计算，分析了钢中含镁夹杂物的组成特点和形成机理。结果表明：钢中的氧化物主要是与MgS复合的2MgO·SiO2或MgO-Al2O3-SiO2类夹杂，析出物主要为MgS、AlN；含MgS的复合夹杂物主要为1~2μm的球状夹杂，因为MgS抑制了MnS的析出，钢中不存在任何形式的MnS夹杂。MgS以包裹在球形氧化物表面、均匀镶嵌在球形夹杂物中、以氧化物为基体或与AlN复合定向析出并长大3种形式存在。热力学计算表明，钢中夹杂物的组成与钢中Mg含量及氧化物特征有关。MgS更容易与含MgO多、硫容量大的MgO-Al2O3-SiO2类夹杂复合析出。MgS以氧化物为基体或与AlN复合定向析出形成的夹杂尺寸更大，其析出长大方式与MgS及夹杂物基体的晶体结构有关。合理控制精炼渣中MgO含量有利于形成含MgS的复合夹杂物，从而减少钢中微细MnS的析出，同时降低钢中MgO·Al2O3的含量。

    Abstract:

    The composition characteristics and formation mechanism are analyzed for magnesium-bearing inclusions in the steel by sampling and thermodynamic calculation. The results show the main oxides is MgS precipitating with 2MgO·SiO2 or MgO-Al2O3-SiO2. And MgS and AlN are the main precipitates. MgS-bearing compound oxide inclusions are mainly globular within 1 μm to 2 μm in size. MgS restricts MnS precipitation, and any type of MnS isn't found in the steel. MgS-bearing inclusions exist in the steel with three forms:MgS wrapped with spherical oxide core, MgS uniformly distributed on the surface of spherical oxides, and MgS orientedly precipitated on oxides matrix or with AlN. Thermodynamic calculation results indicate magnesium content and characteristics of oxides decide the composition of inclusions in the steel. MgS is easy to precipitate with MgO-Al2O3-SiO2 complex with high MgO-bearing and sulphur capacity. The size of inclusions forming by MgS orienteering precipitating on oxides matrix or with AlN is much bigger, and their precipitation and growth method is related with the crystal structure of MgS and inclusions matrix. Fine MnS and MgO·Al2O3 can be diminished by controlling MgO content in refining slag to form composite inclusions bearing MgS.

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朱诚意,罗小燕,李光强,冯嘉鑫,严哲锋.无取向硅钢中含镁夹杂物的形成机理分析[J].重庆大学学报,2018,41(8):34-43.

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  • 收稿日期:2018-01-05
  • 在线发布日期: 2018-08-01
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