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Morphology Study on Inclusion Modifications Using Mg–Ca Treatment in Resulfurized Special Steel

机译：Mg–Ca处理的硫磺特种钢中夹杂物改性的形态研究

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摘要

In resulfurized special steel, MnS and Al2O3 are two main inclusions that deteriorate fatigue life and machinability. It is important that these two inclusions should be well controlled to increase steel quality and usage performance. In the present study, a Mg–Ca treatment was employed to modify the MnS and Al2O3 inclusions in resulfurized steels to reduce detrimental effects on fatigue life and machinability. In the laboratory study, Ni–Mg alloy was added to 16MnCrS5 and 49MnVS3 steels. Both Al2O3 and CaO–Al2O3 were gradually modified to MgO·Al2O3 and MgO, being surrounded by MnS, that is, a complex inclusion with an oxide core and sulfide outer layer was formed. The amount of the complex inclusion increased with Mg content. In the hot forging experiment, non-Mg treated inclusions were in the morphology of long strip, while those with Mg treatment were seen to be less deformed with spherical morphology of low aspect ratio in which case inclusions had less effect on steel mechanical properties. The Mg–Ca treatment was also applied to the manufacture of resulfurized special steel in steel plants. The scanning electron microscope–energy dispersive spectrometer and statistical results agreed well with those in the laboratory studies.
机译：在再硫化的特种钢中，MnS和Al2O3是两个主要的夹杂物，它们会降低疲劳寿命和切削性。重要的是，必须对这两个夹杂物进行良好的控制，以提高钢的质量和使用性能。在本研究中，采用Mg–Ca处理来改性再硫化钢中的MnS和Al2O3夹杂物，以减少对疲劳寿命和切削性的不利影响。在实验室研究中，将Ni-Mg合金添加到16MnCrS5和49MnVS3钢中。 Al2O3和CaO–Al2O3都逐渐被MgO·Al2O3和MgO修饰，并被MnS包围，即形成了具有氧化物核和硫化物外层的复合夹杂物。复杂夹杂物的数量随镁含量的增加而增加。在热锻实验中，未经Mg处理的夹杂物为长条形，而经Mg处理的夹杂物的变形较小，而长径比为球形的则较小，在这种情况下，夹杂物对钢力学性能的影响较小。 Mg-Ca处理还用于钢铁厂中的再硫化特殊钢的生产。扫描电子显微镜-能量色散光谱仪和统计结果与实验室研究相吻合。

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