102Cr17Mo轴承钢铸坯夹杂物及碳化物解析

doi:10.13228/j.boyuan.issn0449-749x.20230065

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摘要 102Cr17Mo钢属于高碳高铬马氏体不锈钢,钢中夹杂物及碳化物的形貌及分布对其性能有重要影响。依托于某厂La-Ce复合稀土改质的102Cr17Mo模铸坯,用光学显微镜、扫描电镜、夹杂物三维腐刻、Thermo-calc软件对其进行解析。结果表明,在102Cr17Mo铸坯中,夹杂物的等效直径集中分布在1～3 μm,夹杂物数量密度集中分布在47～54 个/mm²,夹杂物面积占比分布在0.025 3%～0.028 4%;夹杂物的整体尺寸较小,分布弥散化,不同部位的夹杂物数量密度、面积比例差距较小;夹杂物主要成分为氧、铝、铈、镧和其他等少量元素,夹杂物类型包括稀土氧化物Ce-La-Al-O、稀土氧硫化物Ce-La-Al-O-S,未发现单独存在的Al₂O₃夹杂和MnS夹杂。铸坯中碳化物形貌主要分为3类,即大颗粒状碳化物、聚集状碳化物、网状碳化物。大颗粒状碳化物尺寸约为20 μm,所含主要元素为铁、铬、碳和钼,聚集状碳化物尺寸约达100 μm,所含主要元素为铁、铬、钼和碳,网状碳化物尺寸约为80 μm,所含主要元素为铁、铬、钼和碳。从边部到心部,碳化物的连续性逐渐增加;铸坯中的碳化物相主要为亮白色富含铌元素的MC相、深灰色富铬和铁的块状M₇C₃型碳化物、浅灰色富含铬和铁的M₂₃C₆型碳化物,在M₇C₃碳化物中,铬、铁、钼元素的质量分数分别为62％、28％、1％,铬、铁元素的质量比为2.2;在M₂₃C₆碳化物中,铬、铁、钼元素的质量分数分别为55％、37％、2％,铬、铁元素的质量比为1.5。

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	宋光洁
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关键词 ： 102Cr17Mo, 轴承钢, 夹杂物, 碳化物, 稀土

Abstract：102Cr17Mo steel belongs to high carbon and high chromium martensitic stainless steel. The morphology and distribution of inclusions and carbides in the steel have an important impact on its properties. The 102Cr17Mo mould billet modified by La-Ce composite rare earth in a factory,was analyzed with optical microscope,scanning electron microscope and three-dimensional etching of inclusions,Thermo-calc software. The results show that the equivalent diameter of inclusions in 102Cr17Mo slab is concentrated in 1-3 μm. The quantity density of inclusions is concentrated in 47-54 pieces/mm²,and the proportion of inclusion area is 0.025 3%-0.028 4%. The overall size of the inclusion is small and its distribution is dispersed. The difference between the quantity density and area proportion of the inclusion in different parts is small. The inclusions are mainly composed of O,Al,Ce,La and other small elements. The types of inclusions include rare earth oxide Ce-La-Al-O,rare earth oxide sulfide Ce-La-Al-O-S. No separate Al₂O₃ and MnS inclusions are found. The carbide morphology in the billet can be divided into three types, which are large granular carbide,aggregate carbide and network carbide. The size of large granular carbide is about 20 μm. The main elements are Fe,Cr,C and Mo,and the size of aggregate carbide is about 100 μm. The main elements are Fe,Cr,Mo and C,and the size of network carbide is about 80 μm. The main elements are Fe,Cr,Mo and C. From the edge to the center,the continuity of carbide increases gradually. The carbide phases in the billet are mainly bright white MC phase rich in niobium element, dark gray block M₇C₃ type carbide rich in chromium and iron, and light gray M₂₃C₆ type carbide rich in chromium and iron. In M₇C₃ carbide, the mass fractions of chromium, iron, and molybdenum elements are 62%, 28%, and 1%, respectively, and the mass ratio of Cr/Fe element is 2.2; In M₂₃C₆ carbide, the mass fractions of chromium, iron, and molybdenum are 55%, 37%, and 2%, respectively. The mass ratio of Cr/Fe element is 1.5.

Key words： 102Cr17Mo bearing steel inclusion carbide rare earth

收稿日期: 2023-02-17

引用本文:

宋光洁, 朱浩然, 季灯平, 刘斌, 付建勋. 102Cr17Mo轴承钢铸坯夹杂物及碳化物解析[J]. 钢铁, 2023, 58(8): 157-168. SONG Guangjie, ZHU Haoran, JI Dengping, LIU Bin, FU Jianxun. Analysis of inclusions and carbides in 102Cr17Mo bearing steel billet[J]. Iron and Steel, 2023, 58(8): 157-168.

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