MnS在固态低硫钢中析出的实验室研究  

Laboratory study on precipitation of MnS in solid low sulfur steel

作　　者：沈昶[1,2] 杨峥 郭俊波[1,2] 陆强 SHEN Chang;YANG Zheng;GUO Junbo;LU Qiang(Technical Center of Masteel,Ma’anshan 243002,China;Pivotal Components of Rail Transit Technology Innovation Center of Anhui Province,Ma’anshan 243002,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243002 [2]轨道交通关键零部件安徽省技术创新中心,安徽马鞍山243002

出　　处：《炼钢》2022年第1期49-55,共7页Steelmaking

摘　　要：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MnS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℃,析出的MnS为1~2μm的微颗粒。通过样品表面和皮下的MnS夹杂的对比,发现在特定的温度范围内,表面能可以促进MnS在表面的析出。采用可逆轧机在800~950℃对低硫钢样品进行控温轧制,MnS总量和小尺寸MnS数量都是对比铸坯的3~4倍,其中有的是轧碎的MnS,更多的是在控温轧制过程中析出的小颗粒MnS。结果表明,控温轧制产生的变形能在特定温度范围促进MnS的析出。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.

关 键 词：MnS析出物 共聚焦显微镜 低硫钢 控温轧制 

分 类 号：TF77[冶金工程—钢铁冶金]