离心铸造气门座圈用高铬铸铁的组织及性能研究
Microstructure and Properties of High Cr Cast Iron for Engine Valve Seat
黄之德
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作者单位：（常州轻工职业技术学院， 江苏 常州 213164）
中文关键字：离心铸造； 气门座圈； 高铬铸铁； 大功率内燃机
英文关键字：centrifugal casting; valve seat; high Cr cast iron; heavy duty engine
中文摘要：根据气门座圈的生产和使用要求,研究了一种成分的离心铸造高铬铸铁铸态和回火态的组织和性能。结果表明, 离心铸造的高铬铸铁其铸态组织由初生奥氏体、共晶奥氏体和共晶碳化物组成，回火态组织由回火马氏体、残余奥氏体和共晶碳化物组成;热处理后的高铬铸铁消除了内应力,减小了晶格畸变，具有较好的强度,并且有一定的硬度。离心铸造高铬铸铁气门座圈能满足大功率内燃机的使用要求。
英文摘要：The microstructure and properties of high Cr cast iron under centrifugal casting were investigated according to the requirements in production and application of engine valve seat. The results show that the as-cast microstructure of centrifugal casting high Cr cast iron consists of primary austenite, eutectic austenite and eutectic carbides, the tempered microstructure of the cast iron consists of temper martensite, remain austenitic and carbides； after heat treatment, the high Cr cast iron can eliminate internal stress, reduce lattice distortion and has better strength and hardness. So the centrifugal casting high Cr cast iron can meet the use requirements of the engine valve seat.