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钢中是否能生成稀土氮化物或碳化物,长时间以来一直是个争论的问题,多数认为,钢中不能生成,因为它们的标准生成自由能较高,文献虽谈到钢中发现了CeC_2、CeC_3和CeN但至今还未见到该相组成的报导,也未见到金相图片。最近钢铁研究总院在研制高速钢过程中,发现含硫、氧量较低(S为0.002、O为0.003～0.004％)而氮、铈较高(N为～0.04;Oe≥0.026％)的高速钢中有稀土铈氮、碳化合物。后经光学显微镜反复观察和电子探针分析,证实确为稀土铈氮、碳化合物(见图),尺寸多为3μ左右,最大约5～7μ,在金相显微镜下观察,明场呈浅桔红色或浅灰色,暗场下不透明,偏光下同性。
Whether rare earth nitrides or carbides can be produced in steel has long been a matter of debate for a long time, and most believe that steel can not be formed because their standard free energy of formation is high. Although the literature has found that CeC_2, CeC_3 And CeN but has not yet seen the composition of the reported, nor met the metallographic pictures. Recently, in the process of developing high speed steel, the Institute of Iron and Steel Research found that sulfur and low oxygen (S 0.002, O 0.003 ~ 0.004%) and nitrogen and cerium higher (N 0.04 and Oe 0.026%) High-speed steel with rare earth cerium nitrogen, carbon compounds. After repeated observation by optical microscope and electron probe analysis, confirmed indeed cerium nitrogen nitrogen, carbon compounds (see photo), the size of about 3μ, the maximum about 5 ~ 7μ, observed under a metallographic microscope, bright field was light orange Red or light gray, dark field opaque, polarized under the same sex.