Nb对灰铸铁热疲劳性能的影响  

Influence of Niobium on Thermal Fatigue Properties of Gray Cast Irons

作　　者：朱洪波[1] 闫永生[1] 孙小亮[1] 华勤[1] 翟启杰[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《现代铸铁》2011年第2期45-48,共4页Modern Cast Iron

基　　金：中信-CBMM铌钢研究与开发基金(No.036);上海大学研究生创新基金(No.SHUCX102233)的支持

摘　　要：采用Uddeholm热疲劳方法测定了Nb对灰铸铁热疲劳性能的影响,试验结果表明:(1)Nb的加入能够提高灰铸铁的抗热疲劳性能,随着w(Nb)的增加,试样最大裂纹深度和宽度都逐渐减小;(2)由于Nb细化石墨使裂纹源减少和裂纹扩展途径变细,Nb元素能够改善材料表面经热疲劳处理后恶化的性能。By adopting Uddeholm thermal fatiguing method,the influence of niobium on the thermal fatigue properties of the gray cast irons was tested.The results showed：（1）Niobium addition could improve the thermal fatigue resistance of the gray cast irons.Both the maximum cracking depth and width gradually reduced with increase of the niobium adding amount;（2）Since the niobium could make the graphite finer,reduce the number of cracking sources and make the crack extending tracks narrower,therefore it could reduce the properties worsening of the material after having been thermally fatiguing treated.

关 键 词：灰铸铁 NB 热疲劳 

分 类 号：TG251[金属学及工艺—铸造]