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本试验研究的目的在于选择热处理的工艺规范,以保证有着球形石墨的铸铁能得到必需的机械性能,本试验以原铁素体基体为试样,研究它的显微结构及机械性能。这种铸铁含有下列化学成份:2.93～3.34％C;3.52～4.67％Si;0.84～1.13％Mn;0.003～0.008％S;0.034～0.048％P;0.03～0.06％Mg。用-0.4感应电炉熔化铸铁。用-1硅磁中间合金进行变质处理,浇铸用干砂岩粘土铸型。将尺寸为30×30×400MM的铸锭截成30×30×100MM,用作机械和金相研究的试样。对经过不同规范热处理之后的试样的显微结构进行了研究。在铸造试样的显微结构里,发现了形状规则直径为30～60MM的球形石墨和具有明显晶界的铁素体基体。石墨夹杂物约占显微切片面积的12％。处于铸造状态的铸铁机械性能如下:HB197;
The purpose of this experimental study is to select the heat treatment process specifications to ensure that the graphite with spherical graphite can get the necessary mechanical properties of the original ferrite matrix in this experiment as a sample to study its microstructure and mechanical properties. The cast iron contains the following chemical components: 2.93-3.34% C; 3.52-4.67% Si; 0.84-1.13% Mn; 0.003-0.008% S; 0.034-0.048% P; 0.03-0.06% Mg. Use -0.4 induction furnace to melt cast iron. With -1 silicon magnetic alloy for modification, casting dry sandstone clay mold. The size of 30 × 30 × 400MM ingot cut into 30 × 30 × 100MM, for mechanical and metallographic studies of the sample. The microstructures of specimens after heat treatment under different regulations were studied. In the microstructure of the cast sample, spherical graphite with a regular shape diameter of 30-60 mm and a ferrite matrix with a distinct grain boundary were found. Graphite inclusions account for about 12% of the microsection area. Cast iron in the cast state mechanical properties are as follows: HB197;