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对不同氧含量的16Mn钢进行了La处理,观察实验钢中夹杂物和组织的变化。利用带有能谱仪的扫描电镜和光学显微镜研究了实验钢中夹杂物种类、大小分布及实验钢铸态的组织,同时对夹杂物诱导晶内铁素体形核机制进行了分析。结果表明:随着氧含量的增加,试样中夹杂物主要为LaAlO3和La2O2S复合夹杂及其各自单独夹杂物。在实验条件下,随着氧含量的增加,试样中晶内针状铁素体含量逐渐减少,有利于晶内针状铁素体生成的最佳氧含量约为45×10-6。错配度计算表明,所有的镧氧化物均有形核能力,而La2O2S夹杂形核能力比其他更好。
The La content of 16Mn steel with different oxygen content was measured and the changes of inclusions and microstructure in the experimental steel were observed. The types, size distributions and microstructures of inclusions in experimental steels were studied by scanning electron microscopy and optical microscopy with energy dispersive spectroscopy. The mechanism of inclusions induced intragranular ferrite nucleation was also analyzed. The results show that with the increase of oxygen content, the inclusions in the sample are mainly LaAlO3 and La2O2S composite inclusions and their individual inclusions. Under the experimental conditions, with the increase of oxygen content, the content of intragranular acicular ferrite gradually decreases, which is favorable for the optimum oxygen content of intragranular acicular ferrite to be about 45 × 10-6. Mismatch calculations show that all lanthanum oxides have nucleation capability, while La2O2S inclusions have better nucleation ability than others.