| 发动机排气门用钢5Cr21Mn9Ni4N中的M7C3相与热裂纹原因探讨 |
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| 引用本文： | 刘祖林,牛龙江.发动机排气门用钢5Cr21Mn9Ni4N中的M7C3相与热裂纹原因探讨[J].汽车技术,1996(12):40-44. |
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| 作者姓名： | 刘祖林 牛龙江 |
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| 作者单位： | 武汉汽车工业大学 |
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| 摘 要： | 分析和测定了５Ｃｒ２１Ｍｎ９Ｎｉ４Ｎ钢中Ｍ７Ｃ３相的形貌特征及化学组成，并对钢中钙含量与Ｍ７Ｃ３相及铸，锻件裂纹关系进行了探讨。当该钢中钙含量大于０．００６８％及铸锭冷却过地，就易在该钢中形成大而脆的Ｍ７Ｃ３的晶界薄膜，使铸，锻件常常出现热裂纹。
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| 关 键 词： | 气门 5Cr21Mn9Ni4N钢 M7C3相 汽车发动机 裂纹 |
Discussions on the M7C3 Phase in Steel 5Cr21Mn9Ni4NUsed for Engine Exhaust Valve and Cause of Hot Crackle |
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| Liu,Zhulin,et,al.Discussions on the M7C3 Phase in Steel 5Cr21Mn9Ni4NUsed for Engine Exhaust Valve and Cause of Hot Crackle[J].Automobile Technology,1996(12):40-44. |
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| Authors: | Liu Zhulin et al |
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| Institution: | Liu Zhulin et al |
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| Abstract: | Morphological characteristic and chemical composition of M 7C 3 phase in the steel 5Cr21Mn9Ni4N have been examined and analysed,and relations between calcium content in the steel and M 7C 3 phase as well as hot crackle in casting and forging parts are looked into.It is understood consequantely that large and brittle crystal boundary film of M 7C 3 might grow easily in the steel,which causes hot crackle to appear occassionally in casting and forging parts if calcium content in the steel would be more than 0.0068% and cooling speed of ingot casting too low.The hot crackle can be only eliminated by lowering mainly calcium content in the steel. |
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| Keywords: | Engine exhaust valve 5Cr21Mn9Ni4N M 7C 3Phase Application |
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