Metallurgy Failure Analysis for an Abnormal Fracture Exhaust Valve Made by 6Cr21

机译：6Cr21异形排气门的冶金失效分析。

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The working environment of the exhaust valves is very bad.Valves not only bear high-frequency impact,alternate tension-compression load and thermal stress,but also bear high temperature corrosion and flushing action of high-speed gas.The plate-rod transition region of valves is the second hot spot,which is the and important failure region,because it is very sensitive to corrosion and fatigue.The fracture of valves often causes devastating damage to gas mechanism of engine.The deep metallurgy failure analysis for an early fracture engine exhaust valve was performed through macroscopical and microcosmic as well as chemical composition aspects.The valve ruptured at the transition area between rod and head.The head was made of the austenitic material of 6Cr21Mnl 0MoVNbN (6Cr21).The SEM results showed that the fracture surface consists of fatigue source area,fatigue spreading area and transient breaking area.Obvious shell lines and secondary cracks were found on the fatigue spreading area,so we it was concluded that the valve belonged to fatigue fracture.The loose structure of fatigue source area was the direct reason of fatigue fracture.In addition,the TEM observation of the slice cut from the region closing to the fatigue source of fracture surface showed that deep areas near the surface of the valve were oxidized severely,and the oxidized area was full of micro cracks and holes.This resulted in the declining of the intensity,ductility and bearing capacity,etc.leading to the fracture of the valve.

机译：排气门的工作环境非常恶劣。阀门不仅承受高频冲击，交替的拉压载荷和热应力，而且还承受高速气体的高温腐蚀和冲洗作用。气门嘴是第二个热点，是重要的失效区域，因为它对腐蚀和疲劳非常敏感。气门嘴的破裂通常会对发动机的气体机理造成毁灭性的破坏。排气阀是从宏观，微观，化学组成两个方面进行研究的，该阀在杆和头部之间的过渡区域破裂，头部由6Cr21Mnl 0MoVNbN（6Cr21）的奥氏体材料制成，SEM结果表明断裂面由疲劳源区，疲劳扩展区和瞬态断裂区组成。在疲劳扩展区发现明显的壳线和二次裂纹。可以认为该阀属于疲劳断裂。疲劳源区域的松动是疲劳断裂的直接原因。另外，从靠近断裂面疲劳源的区域切开的切片的TEM观察表明阀门表面附近的深部区域被严重氧化，氧化区域充满微裂纹和孔洞，导致强度，延展性和承载力等下降，导致阀门断裂。

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来源
《Proceedings of remanufacturing international forum 2012》|2012年|568-574|共7页
会议地点 Beijing(CN)
作者
ZHANG Yu-bo; XU Bin-shi; WANG Hai-dou; ZHU Li-na;
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作者单位

National Key Lab for Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China;

National Key Lab for Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China;

National Key Lab for Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China;

National Key Lab for Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China;

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原文格式 PDF
正文语种 eng
中图分类机械制造工艺;
关键词
exhaust valve; failure analysis; 6Cr21 austenitic steel; open texture; inner oxidation;

机译：排气门;故障分析; 6Cr21奥氏体钢;开孔组织;内部氧化;

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Metallurgy Failure Analysis for an Abnormal Fracture Exhaust Valve Made by 6Cr21

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