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为了解决用铁素体球墨铸铁取代可锻铸铁制作汽车底盘零件的可能性问题,我们对铁素体球墨铸铁的常温机械性能、疲劳以及实物静压、台架疲劳、道路等进行了试验;重点评定了铁素体球墨铸铁的低温脆性,测定了铁素体球墨铸铁冲击韧性—脆性转变温度曲线,进行了数理统计分析,与可锻铸铁进行了大量实物取样的低温一次冲击对比试验,同时还进行常温、低温多次重复冲击试验。结果表明,铁素体球墨铸铁抗拉、屈服、疲劳及延伸率等均比可锻铸铁高,两者具有大致相同的冲击韧性—脆性转变温度;而常温低温一次冲击抗力及多次重复冲击抗力均比国内黑心可锻铸铁高,实物静压台架疲劳和道路试验也都达到要求。因而,用铁素体球墨铸铁取代可锻铸铁在材质性能方面是完全可行的。
In order to solve the possibility of replacing the malleable cast iron with the ferrous nodular cast iron, we tested the room-temperature mechanical properties, fatigue and physical static pressure of the ferritic ductile iron, the fatigue of the cradle, the road and so on; Ferritic ductile iron low temperature brittleness, ferritic ductile iron impact toughness - brittle transition temperature curve, the mathematical statistics, and malleable cast iron were a lot of physical comparison of low temperature impact test, but also at room temperature, low temperature Repeated impact test several times. The results show that the tensile, yield, fatigue and elongation of ferritic ductile cast iron are all higher than that of malleable cast iron, and both have almost the same impact ductile-brittle transition temperature. The low temperature one-shot impact resistance and multiple repetitive impact resistance Domestic black malleable cast iron, physical static pressure bench fatigue and road tests have also met the requirements. Therefore, the use of ferrite nodular cast iron instead of malleable iron in the material properties is entirely feasible.