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本文系统研究了高镍低膨胀奥氏体球铁的组织与性能.其基体组织为奥氏体加少量晶间碳化物,厚壁铸件的石墨组织除球墨外还有碎块状石墨.含Ni33—36%的奥氏体球铁在室温至200℃时膨胀系数为(6.6 —6.7)×10~(-6)1/℃ ;铸态机械性能为σ_b320—380N/mm~2,σ_(0.2)180—260N/mm~2,HB160—185,a_K20—85J/cm~2,E100—110KN/mm~2,可以满足光学及精密机械的镜头合金和受力零件材料对膨胀系数与机械性能的要求.本文还研究了其它物理性能和铸造性能,并对晶间碳化物和碎块状石墨的形成原因进行了分析探讨.
In this paper, the microstructure and properties of high nickel low expansion austenitic ductile iron have been investigated systematically.The matrix is composed of austenite and a small amount of intergranular carbides, -36% austenitic ductile iron exhibits an expansion coefficient of (6.6-6.7) × 10 -6 / ° C at room temperature to 200 ° C; σ_b320-380N / mm ~ 2, σ 0.2 ) 180-260N / mm ~ 2, HB160-185, a_K20-85J / cm ~ 2, E100-110KN / mm ~ 2 to meet the optical and precision machinery of the lens alloy and bearing parts of the material on the expansion coefficient and mechanical properties Requirements.This paper also studied other physical properties and casting properties, and the formation of intergranular carbide and crumb graphite was analyzed.