碳对K536合金冷热疲劳性能的影响  

Effect of Carbon Content on Fatigue Property of K536 Superalloy

作　　者：范强[1] 韩锋[1] 杜婷[1] 

机构地区：[1]北京北冶功能材料有限公司,北京100192

出　　处：《金属材料研究》2012年第1期17-21,共5页Research on Metallic Materials

摘　　要：K536合金的碳含量范围较宽，了解碳元素及含量对冷热疲劳性能的影响很有必要。用真空感应炉精铸4种不同碳含量的K536合金并做冷热疲劳试验，对其组织进行观察。结果表明，裂纹产生的主要来源是碳化物，冷热疲劳裂纹的扩展途径主要在碳化物内部或碳化物与基体的界面进行，碳化物是疲劳裂纹萌生与扩展的主要部位和通道。It is necessary to understand the effect of carbon continent on fatigue property of K536 superalloy as the superalloy has a wide range of carbon content. By a vacuum induction furnace, K536 superalloys with different carbon contents were prepared and cold and hot fatigue tests of the superalloy were carried out, microstructures of the superalloys were observed. Results show that the main contribution of crack development is associated with carbide in the superalloy. Carbides in K536 superalloy were the main sites and passage way for the crack formation and development.

关 键 词：碳化物 冷热疲劳 疲劳裂纹 

分 类 号：TG142.45[一般工业技术—材料科学与工程]