High temperature stress relaxation of a Ni-based single-crystal superalloy

摘要：

　　at high temperatures. This makes the material suitable for high temperature applications such as gas turbines and aero engines. By use of single-crystal instead of poly-crystal material, both creep and fatigue properties are enhanced. Superalloys in single-crystal form exhibit an anisotropic behaviour and a tension/compression asymmetry. This makes it interesting to study different crystal orientations in both tension and compression. In this study, high temperature stress relaxation of a Ni-based single-crystal superalloy is investigated. Specimens with three different crystal orientations, 〈001〉, 〈011〉 and 〈111〉, were tested in both tension and compression. Results show an anisotropic stress relaxation behaviour, as well as a tension/compression asymmetry for all directions. During stress relaxation at 750℃, the creep properties decreases in the sequence 〈001〉, 〈011〉 and 〈111〉 in tension, while in compression 〈001〉 = 〈011〉, 〈111〉. However, at 950℃ the creep properties are slightly better in the 〈011〉 direction compared to the 〈001〉 direction.

关键词： single-crystal superalloy thermomechanical fatigue stress relaxation

作者: Mikael Segers(a)ll Johan J. Moverare Daniel Leidermark Kjell Simonsson

作者单位: Department of Management and Engineering,Link(o)ping University,Link(o)ping SE-58183,Sweden Department of Management and Engineering,Link(o)ping University,Link(o)ping SE-58183,Sweden;Siemens

会议类型: 国际会议

会议名称: 第13届国际断裂大会(ICF2013)

会议地点: 北京

会议语种:英文

页码: 1-10

在线出版日期: 2013-06-16（万方平台首次上网日期，不代表论文的发表时间）