| 某飞机GH1140排气导管裂纹分析 |
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| 引用本文： | 李智锋.某飞机GH1140排气导管裂纹分析[J].理化检验(物理分册),2011(6):379-381. |
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| 作者姓名： | 李智锋 |
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| 作者单位： | 西安飞机工业(集团)有限责任公司; |
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| 摘 要： | 某飞机在进行检查时发现,其起动机GH1140高温合金排气导管内层加强筋处有一条裂纹,采用化学成分分析、金相检验、断口分析等方法对裂纹产生的原因进行了分析。结果表明:由于高温气体的冲刷作用使排气导管内表层晶界出现了贫铬,降低了合金的强度、持久性能和疲劳性能;排气导管开裂主要是由于其内表面曾被打磨,打磨处形成应力集中萌生裂纹源,在起动机内部反复热应力和机械振动等作用下,以及表面氧化物的进一步促进作用下发生的热疲劳开裂。
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| 关 键 词： | GH1140高温合金 排气导管 裂纹 热疲劳开裂 |
Crack Analysis of GH1140 High Temperature Alloy Vent-pipe in Some Plane |
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| LI Zhi-feng Company Ltd.,Xi'an ,China.Crack Analysis of GH1140 High Temperature Alloy Vent-pipe in Some Plane[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2011(6):379-381. |
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| Authors: | LI Zhi-feng Company Ltd Xi'an China |
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| Affiliation: | LI Zhi-feng (Xi'an Aircraft Industry(Group)Company Ltd.,Xi'an 710089,China) |
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| Abstract: | A crack was found in the inter stiffener of GH4110 high temperature alloy vent-pipe of starting engine when the plane was checked.Chemical compositions analysis,metallographic examination and fracture analysis were used to analyze the cracking reason of the vent-pipe.The results show that the grain boundary presented poor chromium in the pipe inwall surface because of the role of high-temperature gas erosion,which reduce the strength,lasting and fatigue properties of the alloy.The vent-pipe failure was the ... |
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| Keywords: | GH1140 high temperature alloy vent-pipe crack thermal fatigue cracking |
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