微量硫对K4169合金组织与性能的影响  

EFFECTS OF SULPHUR CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ALLOY K4169

作　　者：周兰章[1] 郭建亭[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《金属学报》1995年第6期A261-A265,共5页Acta Metallurgica Sinica

摘　　要：研究微量硫含量对Ｋ４１６９合金的枝晶组织和元素偏析的影响，并测定了不同硫含量合金的室温、６５０℃瞬时拉伸性能以及６５０℃，６２０ＭＰａ条件下持久性能．结果表明，硫偏聚在枝晶间，促进Ｙ相和Ｌａｖｅｓ相形成，明显降低瞬时拉伸性能和持久性能．Sulphur segregated strongly to interdendritic regions and promoted to form Y-M_2SC phase during solidification, and it also promoted segregation of Nb to form Laves phase. The more sulphur in the alloy, the more Laves phase formed. Mechanical Properties test showed that sulphur had bad effects on tensile properties at room temperature and at 650℃, and strongly decreased stress-rupture properties at 650℃, 620 MPa. Observation under SEM revealed that in high sulphur content alloy the fracture feature of Laves phase was of cleavage,and cracks initiated at Laves-matrix interfaces.

关 键 词：微量元素 显微组织 力学性质 镍基合金 

分 类 号：TG146.15[一般工业技术—材料科学与工程]