MnS在固态低硫钢中析出的实验室研究

采用高温激光共聚焦显微镜对低硫钢试样抛光表面的MnS夹杂物析出进行了观察,利用高温激光共聚焦观察结果进行了控温轧制M nS析出试验,用SEM-EDS和ASPEX分析了析出物的成分.结果表明,MnS在表面的首次析出发生在1067℃并伴随有表面变形,在859.7℃当界面能随表面变形释放后停止,MnS的第二次析出发生在790...

Laboratory study on precipitation of MnS in solid low sulfur steel

MnS inclusions precipitation on polished surface of solid low sulfur steel was observed by confocal microscopy,and by making use of confocal observation results the experiment on MnS precipitation by temperature-controlled rolling was carried out,the composition of precipitated inclusions was analyzed by SEM-EDS and ASPEX.The results show that the first precipitation of MnS occurs at 1067℃with surface distortion,and stops at 859.7℃while the interfacial energy is released with the distorted surface.The second precipitation of MnS occurs at 790℃,the precipitated MnS is micro-granular of 1-2μm.Compared with the MnS inclusions on the surface and subsurface of sample,it is found that surface energy promotes the precipitation of MnS on the surface in a specific temperature range.The low sulfur steel sample is rolled at set temperature between800-950℃using reversible mill rolling,both amount of total MnS and small size MnS are 3-4times as many as billet sample,some of them are rolled broken MnS,and more are small size granular MnS which precipitated during temperature-controlled rolling.It shows that the deformation energy produced by rolling force can promote the precipitation of MnS in a specific temperature range.