DOI: 10.11908/j.issn.0253-374x.21111

作者:

作者单位: 同济大学 航空航天与力学学院，上海 200092


作者简介: 贺鹏飞（1962—） ，男，教授，博士生导师，工学博士，主要研究方向为复合材料力学与计算力学。 E-mail： ph232@tongji.edu.cn


通讯作者:

中图分类号: TG132.3+2


基金项目: 航空发动机及燃气轮机重大专项基础研究（2017-IV-0003-0040）




Effect of Crystal Orientation on Creep Properties of DD6 Single Crystal Superalloy
Author:

Affiliation: School of Aerospace Engineering and Applied Mechanics， Tongji University， Shanghai 200092 ， China


Fund Project:




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摘要:针对航空发动机镍基单晶涡轮叶片高温服役下蠕变寿命的取向敏感性难题，开展了DD6单晶合金［001］、［011］与［111］3种典型取向在980^oC下的蠕变试验，获得了服役温度下单晶合金的蠕变寿命、伸长率，均为［111］取向>［001］取向>［011］取向；通过对蠕变过程中微观组织演化以及蠕变断裂后断口形貌进行分析，揭示了不同取向下单晶合金的蠕变失效机理；基于晶体塑性理论，建立了DD6单晶考虑取向敏感性的粘塑性本构及损伤方程，能够较好地拟合不同晶体取向单晶的蠕变过程，为单晶叶片的强度分析与寿命预测提供参考。



Abstract:In order to study the orientation sensitivity for creep life of aero-engine nickel-based single crystal turbine blades serving under high temperature， creep tests of DD6 single crystal superalloy were carried out with three typical orientations ［001］， ［011］ and ［111］ at 980^oC， indicated that the creep life and elongation of the single crystal alloy are both ［111］ > ［001］ > ［011］. By analyzing the microstructure evolution during the creep process and the fracture morphology after creep fracture， the creep failure mechanism of single crystal alloy with different orientations is revealed. Based on the crystal plasticity theory， the viscoplastic constitutive equation and damage equation considering the orientation sensitivity of DD6 single crystal were established， which could well fit the strain-time curve of single crystal with different crystal orientations， and provided a reference for the strength analysis and life prediction of single crystal blade.





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