定向结晶材料高温蠕变规律研究  

STUDY OF HIGH TEMPERATURE CREEP DEFORMATION FOR CRYSTALLIZING MATERIALS

作　　者：戴福隆[1] 尚海霞[1] 林国松[1] 王国韬[1] 蒋小林[1] 董本涵[2] 

机构地区：[1]清华大学工程力学系,北京100084 [2]沈阳航空发动机研究所,沈阳110015

出　　处：《力学学报》2002年第2期186-191,共6页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(19472038)资助项目

摘　　要：利用高温云纹干涉法对航空发动机叶片定向结晶材料的高温蠕变进行了测试，获得该材料不同主方向的高温蠕变性质和规律．实验结果表明定向结晶材料在结晶方向和各向同性平面的蠕变性质有很大差异．Recently, the mechanical properties and the failure mechanism of materials and structures working under high temperature condition have attacted increasing concern in many research fields. The high temperature creep deformation of certain material used in aerial engines lamina was detected by means of high temperature moire interferometry in this paper. A high temperature moire interferometry measurement system was developed, which was successfully used to measure deformations under high temperature in real time. This system included a high temperature moire oven, a four-beam moire interferometer, and high temperature gratings. A computer was used to collect and analyse the moire fringe patterns. The above system was used to the study of creep deformations of the DZ17G crystallizing material which was widely used in aerial engines. The working temperature of the material is 700℃ to 800℃ .The specimens used in experiments were extracted in two directions: one parallel to the crystallizing direction and the other perpendicular to the former direction. The mechanical properties of material in different principal directions under high temperature were obtained, as well as the creep deformation rule of the material under different stress and temperature. The experimental results showed that the creeping properties of material varied with the different crystallizing directions, which will provide important data for design of aerial engines lamina. It also proved that moire interferometry was an effective way in detecting creep deformation under high temperature, and enlarged the research fields of high temperature mechanics measure.

关 键 词：定向结晶材料 高温云纹干涉法 高温蠕变 航空发动机 叶片 结晶方向 各向同性平面 

分 类 号：V228.5[航空宇航科学与技术—飞行器设计]