电解萃取研究稀土元素对耐候钢中夹杂物的影响  

Effect of rare earths on inclusions in weathering resistant steel by electrolytic extraction

作　　者：许洁 李玲霞[1] 李继康[1] 陈鹰[1] 吴赵波 XU Jie;LI Lingxia;LI Jikang;CHEN Ying;WU Zhaobo(Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院中心实验室,北京100081

出　　处：《物理测试》2022年第5期12-16,共5页Physics Examination and Testing

摘　　要：为了研究稀土元素对钢中夹杂物的改性影响,以未添加稀土元素的Q235和添加了稀土元素的Q235RE两种耐候钢为研究对象,采用非水溶液电解萃取和物理磁选分离的方法提取出钢中的夹杂物,结合X射线衍射仪、扫描电镜和能谱仪分别对其类型、三维形貌进行研究。研究结果表明:未添加稀土元素的Q235钢中的夹杂物类型主要是硫化锰和铝、硅的复合氧化夹杂,且尺寸较大,呈现不规则多角状的镁铝氧化物、氧硫复合夹杂物尺寸可达40μm,长条状硫化锰夹杂尺寸可达50μm;稀土耐候钢Q235RE中夹杂物的类型主要是氧硫稀土复合夹杂物,夹杂物尺寸明显变小,长条状的硫化物被规则的球状的稀土硫化物及稀土氧硫复合夹杂物所取代,不规则多角状的氧化夹杂物尺寸小于15μm,尺寸减小了约60%。In order to investigate the modification effect of rare earth elements on inclusions in steel, two kinds of weathering steels, i.e., Q235 without rare earth elements and Q235 BRE with rare earth elements, were studied. The inclusions in steels were extracted by non-aqueous electrolytic extraction and physical magnetic separation. X-ray diffractometer, scanning electron microscope and energy dispersive spectrometer were used to analyze the types and three-dimensional morphology of inclusions. The results showed that the inclusions in Q235 steel without addition of rare earth elements were mainly composed of manganese sulfide and mixed oxide inclusions of aluminum and silicon. The size was relatively large. Irregular polygonal inclusions of magnesium and aluminum oxide and oxygen-sulfur composite inclusions were up to 40 μm in size, and long strip manganese sulfide inclusions could be 50 μm in size. The inclusions in rare earth weathering steel Q235 RE were mainly oxygen-sulfur rare earth composite inclusions, and the size was obviously smaller. The long strip sulfide was replaced by regular spherical rare earth sulfide and rare earth oxygen-sulfur complex inclusions. The size of irregular polygonal oxide inclusions was less than 15 μm, decreasing by about 60%.

关 键 词：电解萃取 耐候钢 稀土改性 非金属夹杂物 三维形貌 

分 类 号：TG142.1[一般工业技术—材料科学与工程]