| 田昊，宋文兴，马世岩，王雷，李青.DD6 单晶合金涡轮叶片排气窗裂纹分析[J].航空发动机,2020,46(1):80-85 |
| DD6 单晶合金涡轮叶片排气窗裂纹分析 |
| Crack Analysis of Exhaust Window of DD6 Single Crystal Alloy Turbine Blade |
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| DOI： |
| 中文关键词: DD6 单晶合金 涡轮叶片 疲劳裂纹 再结晶 铸造残余应力 航空发动机 |
| 英文关键词:DD6 single crystal turbine blade fatigue crack recrystallization casting residual stresses aeroengine |
| 基金项目:航空动力基础研究项目资助 |
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| 中文摘要: |
| 针对DD6 单晶合金涡轮叶片在试车一定时数后发生的排气窗裂纹故障，通过裂纹特征观察、断口形貌对比、金相组织检
查、化学成分分析和微裂纹模拟试验等方法，进行裂纹性质及产生机理的研究。结果表明：叶片排气窗裂纹性质为疲劳裂纹，起源于
间隔墙转接部位再结晶晶界处的微裂纹；试车时振动应力的作用使微裂纹扩展；间隔墙部位的再结晶晶粒在试车前已经存在，与过
大的铸造残余应力有关，再结晶检验时腐蚀液侵蚀再结晶晶界形成微裂纹；在叶片铸造时，型芯强度对间隔墙再结晶有明显影响，
型芯的强度越高，产生再结晶的几率越大。 |
| 英文摘要: |
| In view of the crack failure of exhaust window of DD6 single crystal alloy turbine blade after a certain number of hours of
the test run，the crack property and mechanism were studied by means of crack characteristics observation，fracture morphology comparison，
metallographic examination，chemical composition analysis and microcrack simulation test. The results show that the crack property of the
blade exhaust window is fatigue crack，which originates from the recrystallization boundary of the partition wall. The action of vibration
stress during test run makes the crack propagation. Recrystallization grain of the partition wall part has existed before the test run，which is
related to the excessive casting residual stress，and the corrosion liquid attack the recrystallization grain boundary to form the microcrack at
the time of the recrystallization test. In blade casting，the strength of the core has an obvious effect on the crystallization of the partition wall.
The higher the strength of the core，the greater the probability of recrystallization. |
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