学位：博士
职称：教授
所在单位：材料科学与工程学院
长期从事金属材料蠕变、组织演化、损伤及寿命预测工作。主持和参加国家自然科学基金重点和面上项目6项，“863”计划课题2项，省部级及企业项目20余项。获国家发明专利5项，发表学术论文200余篇。出版专著“耐热钢持久性能的统计分析及可靠性预测”1部（科学出版社），译著“高温合金”1部，编著1部。获辽宁省教学名师，宝钢教育奖优秀教师奖。辽宁省教学成果一等奖1项，国家本科一流课程、国家精品在线开放课程负责人。Emerald出版社颁发的学术奖“Literati Club Awards for Excellence”，金属学报2009-2015年度优秀论文奖。省部级科技奖励一等奖、二等奖5项。
The effect of thickness on the creep properties of a single-crystal nickel-based superalloy
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论文类型：期刊论文
发表时间：2018-06-13
发表刊物：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
收录刊物：SCIE
卷号：728
页面范围：124-132
ISSN号：0921-5093
关键字：Creep; Single crystal; Oxidation; Internal nitrides; Voids; Crack
摘要：Creep rupture tests were conducted at 980 degrees C/250 MPa on specimens with different wall thickness values obtained from a single-crystal nickel-based superalloy. Experimental results showed that the thin specimens had an inferior creep life compared with the thick ones. All specimens were oxidised during the creep tests. Electron probe microanalysis and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy revealed that internal nitrides developed in the y'-free zone and even in the matrix. The presence of internal nitrides induced the nucleation of creep voids and initiation of cracks during creep rupture, thereby increasing the growth rate of cracks and facilitating the failure of the creep specimens. The morphology of the fracture sections indicated that the interaction of cracks and creep damage also contributed to this phenomenon. Cracks played an important role in the creep behaviour of the thin specimens, and creep damage effectively influenced that of the thick specimens.
发表时间：2018-06-13
