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。
Creep-induced microstructural evolution in a nickel-based superalloy designed for advanced ultra-supercritical boilers
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论文类型：期刊论文
发表时间：2018-05-01
发表刊物：MATERIALS CHARACTERIZATION
收录刊物：SCIE、EI
卷号：139
页面范围：311-318
ISSN号：1044-5803
关键字：Ni-based superalloy; Precipitates; Grain boundary; Creep; Advanced ultra-supercritical
摘要：Long-term microstructural stability is a major concern for candidate materials used in advanced ultra-super-critical (A-USC) power plants. In the present work, precipitation behavior of a nickel based superalloy designed for A-USC boilers, with a base composition of Ni-25Cr-20Co, was investigated during long-term thermal exposure under different stresses at 1043 K. The results showed that the coarsening of gamma' precipitates in the grain interior had occurred during thermal exposure in the presence and absence of stress. The microstructure around grain boundary was altered remarkably under stress. The precipitate-free zones (PFZs) commonly existed near the grain boundary in the gauge sections of specimens after long-term creep. Coarsened and elongated particles in the PFZs were identified as gamma'-Ni-3 (Ti, Al) precipitates by chemical composition analysis and diffraction pattern. Furthermore, the morphology and distribution of MC-type carbides have no significant changes observed due to their good stability, but discontinuous M23C6 appeared under stress, due to formation of PFZs resulting in dissolution of the adjacent M23C6. Besides, the creep-rupture mechanism was discussed to explore a potential approach for improving creep properties.
发表时间：2018-05-01
