摘要
钢中的稀土元素的加入能够改变内生夹杂物的组成和形态,并起到净化钢液的作用,因此在许多低合金钢中被广泛应用,但不同状态稀土元素对钢材性能的影响机制尚不明晰。由于稀土元素与O和S等非金属元素都有较强的结合能力,导致稀土元素在钢中的赋存形态复杂,这也为钢中稀土夹杂物的分类定量表征带来了较大困难。因此,将扫描电镜多视场连续测试、特征颗粒物图像快速定位、识别和能谱自动分析技术相结合,实现了稀土油井管用钢较大尺寸范围内含铈夹杂物的原位定量统计分布表征,获得了不同类型Ce夹杂物的位置、组成、形貌、尺寸和数量的全域统计信息。探讨了不同Ce含量对钢中含Ce夹杂物组成、数量和尺寸分布的影响规律。当Ce含量较少时,Ce夹杂物会与Al、Mn夹杂物复合存在,较多含Ce夹杂物颗粒包覆或嵌入灰黑色的Al2O3和Mn S。当Ce含量增加时,单一Ce夹杂物逐渐形成,其形貌为球形或长椭球形,颗粒尺寸主要位于1~4μm之间,结合能谱自动分析结果可知,这些颗粒物以Ce的氧化物、氧硫化物和硫化物为主。Ce含量较高时也会形成Ce的磷化物,且含P的稀土Ce化合物在测试区域呈现一定的条带状分布。
The addition of rare earths to steel can alter the composition and morphology of endogenous inclusions and play a role in the purification of steel.Therefore,it is widely used in many low alloy steels.However,the mechanism by which different states of rare earth elements affect the properties of steel remains unclear.The presence of rare earth elements in steel leads to a complex morphology due to their strong affinity with nonmetallic elements such as oxygen and sulfur.This complexity poses challenges in the classification and quantitative characterization of rare earth inclusions in steel.A combination of continuous acquisition of multi-field images for scanning electron microscopy(SEM),automatic identification of characteristic particles and high-performance energy dispersive spectrometer have been used to achieve the characterization of the location,composition,size and amount of rare earth inclusions in oil well pipe steel over a wide range of dimensions.The impact of varying Ce contents on the types,quantities and sizes of rare earth inclusions in steel has been studied.When the Ce content is low,more Ce-containing inclusions encapsulate or embed Al2O3 and MnS.As the Ce content increases,single Ce inclusions gradually form.These inclusions are spherical or long ellipsoidal with particle sizes ranging mainly between 1 and 4μm.These particles are dominated by Ce-O,Ce-O-S,and Ce-S.Phosphides of Ce are formed at higher Ce content.The P-containing rare earth inclusions exhibit banding in the test area.
作者
周雪凡
李冬玲
周晴晴
杨峰
刘智
汪兵
ZHOU Xuefan;LI Dongling;ZHOU Qingqing;YANG Feng;LIU Zhi;WANG Bing(Central Iron and Steel Research Institution Co.,Ltd.,Beijing 100081,China;The NCS Testing Technology Co.,Ltd.,Beijing 100081,China;Beijing Key Laboratory of Metallic Materials Characterization,Beijing 100081,China;Technology Center,Baogang United Steel,Baotou 014010,Nei Mongol,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2024年第8期1089-1097,共9页
Journal of Iron and Steel Research
基金
钢中稀土微合金化产业技术研究与应用(CXZX-B-202308-0008)
钢铁研究总院有限公司自主投入研发专项资助项目(事23160360ZD)。
关键词
稀土油井管用钢
Ce夹杂物
定量统计分布表征
扫描电镜
能谱
rare earth oil well pipe steel
Ce-containing inclusion
quantitative statistical distribution
scanning electron microscope
energy spectrum
