1Cr18Ni9Ti不锈钢中的硫与晶界沉淀  

SULFUR AND GRAIN BOUNDARY PRECIPITATE IN 1Crl8Ni9Ti STAINLESS STEEL

作　　者：李玉清 汪慈榕 柳学胜 关云 

机构地区：[1]大冶钢厂钢铁研究所,黄石435001

出　　处：《理化检验（物理分册）》1995年第1期20-23,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：硫含量较低时,900℃加热后晶界只存在片状TiC(和Ti(CN));硫含量较高时,晶界还存在片状Ti_2CS;1100℃加热时,晶界Ti_2CS片较大、较厚.实验钢中的Ti_2CS存在着一种与以前的研究不尽相同的沉淀机制:在900℃加热时及其后的冷却过程中和650℃加热时,点阵中的Ti、S和C向晶界偏聚,Ti_2CS以片状和粒状沿晶界沉淀.敏化处理时,硫含量较高的钢中,偏聚到晶界的硫原子可能抑制晶界Cr_(23)C_6沉淀.After heating at 900 C ,only the lamellar TiC (and Ti(CN))existed at grain boundary in the steel with lower sulfur content,and also the lamellar Ti2CS existed at grain boundary in the steel with higher sulfur content. Grain boundary Ti2CS lamellae were larger and thicker after heating at 1100 C. For Ti2CS in the steel tested,there was a precipitate mechanism which was different from some mechanisms reported in previous researches. During both heating at 900 C and cooling after the heating and during heating at 650 C .the atoms such as Ti·S and C in lattice segregated into grain boundaries and precipitated as Ti2CS lamellae and particles at grain boundaries. During sensitized treatment,the sulfur atoms could restrain precipitate of Cr23C6 at grain boundaries in the steel with higher sulfur content.

关 键 词：晶界沉淀 硫 晶界偏聚 不锈钢 镍铬钢 

分 类 号：TG142.71[一般工业技术—材料科学与工程]