稀土元素Ce对2Cr13不锈钢中夹杂物变性的影响

Effect of Rare-Earth Element Ce on Modification of Inclusion in Stainless Steel 2Cr13

2Cr13(0.19％C、12.88％Cr)马氏体不锈钢由非自耗真空电弧炉冶炼,在铸模加入0～0.18％的Ce。用光学和扫描电镜(SEM)、X-射线能谱仪观察和分析钢中夹杂物形貌和成分。结果表明,未加稀土元素Ce时,钢中夹杂物尺寸为19.33μm的不规则MnS、Cr_2S_3和FeS复合夹杂物;加入0.14％Ce,钢中夹杂物为近似椭球状稀土夹杂物,尺寸18.64μm;复合夹杂物内部为稀土硫化物,外部为稀土硅酸盐;加入0.16％～0.18％Ce时,钢中夹杂物为椭球或球形稀土硅酸盐,尺寸为7.69～8.15μm。

Martensite stainless steel 2Cr13 （0. 19C, 12. 88Cr） was melted by a vacuum non-consumable arc furnace and 0 -0. 18% Ce was added in casting ingot. The morphology and ingredient of inclusion in steel was observed and ana- lyzed by using optical and scanning electron microscope and X-ray energy dispersive spectrometer. Results showed that with no-adding rare-earth element Ce the inclusion in steel was irregular MnS, Cr2S3 and FeS compound inclusion with dimension 19. 33 um, with added 0. 14% Ce the inclusion in steel was compound rare-earth （RE） inclusion （inner RE sulphide and outside RE silicate） approximated ellipsoid with dimension 18. 64 um and with added 0. 16% -0. 18% Ce the inclusion in steel was ellipsoid or spheroid RE silicate with dimension 7.69 - 8. 15 um.