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论文成果
Influence of specimen thickness on the creep behavior of a directional solidification nickel-based sulperalloy
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论文类型: 期刊论文
发表时间: 2018-04-01
发表刊物: VACUUM
收录刊物: SCIE、EI
卷号: 150
期号: ,SI
页面范围: 105-115
ISSN号: 0042-207X
关键字: Creep; Oxidation; Crack; Creep damage
摘要: The effects of thickness and surface signature on the creep life of a directionally solidified nickel based superalloy were investigated. The creep tests of ground specimens in the thickness of 0.61 mm and 0.89 mm, as well as polished ones with 0.66 mm and 0.87 mm in thickness were performed at 980 degrees C/160 MPa. Based on the experimental results, the thin ones had inferior creep life compared with thick specimens. XRD exhibited that all the specimens were oxidized during the creep tests, however, the non-loading bear zones which caused by oxidation was insufficient to explain the creep life of specimens under different wall thicknesses. On the other hand, the morphology of fracture sections indicated that the interaction of cracks and creep damage could reveal this phenomena. It worth noting that the cracks played a more important role in the creeping of thin specimens, but creep damage influenced the thick specimens more effectly. In addition, the polished specimens had a better behavior during creep tests than the ground ones. (C) 2018 Elsevier Ltd. All rights reserved.

程从前

副教授   博士生导师   硕士生导师

任职 : 院长助理,中国腐蚀与防护学会高温专业委员会委员,中国机械工程学会理化检验分委员会委员,辽宁省化工学会腐蚀与防护专业委员会委员

性别: 男

毕业院校:大连理工大学

学位: 博士

所在单位:材料科学与工程学院

学科:材料学

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