摘要
总结了高镍球铁排气管铸件的铸造工艺,对影响高镍奥氏体球墨铸铁球化率和力学性能的饱和度数据做了新的探索,当饱和度A达到4.9时也生产出了球化合格的铸件。把均衡凝固技术运用到高镍奥氏体球铁铸件,克服了热节处碎块状石墨的问题。通过与国外某公司退火处理比对试验,验证了本文的热处理工艺是合理的。生产出的铸件远远超出了ASTM标准规定的力学性能指标,达到了抗拉强度大于400 MPa的概率为100%。
The casting process of high-nickel ductile iron exhaust pipe is summarized, and the saturation degree, which effects the spheroidization rate and mechanical properties of high-nickel austenite ductile cast iron, is discussed. When saturation A reaches up to 4.9, a casting with a good quality of spheroidization can also be produced. Furthermore, the chunky graphite on hot spots of high-nickel austenite ductile iron casting is solved utilizing proportional solidification technology. The heat treatment process is verified to be reasonable when compared with that in a foreign company. The mechanical properties of castings manufactured is far above the ASTM specification and the tensile strength of all castings is above 400 MPa.
出处
《铸造技术》
CAS
北大核心
2008年第11期1456-1460,共5页
Foundry Technology
关键词
高镍球铁
排气管
铸造工艺
饱和度
高温退火
力学性能
High-nickel ductile iron
Exhaust pipe
Casting process
Saturation degree
Hightemperature annealing
Mechanical properties
