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研究了锰对奥—贝球铁的组织与性能的影响后发观、锰能提高残余奥氏体的稳定性; 增加等温淬火后残余奥氏体的含量;推迟贝氏体转交第一、二阶段的到来。这些现象当等温温度大于410℃时更明显。当等温温度小于350℃时,锰含量提高,球铁等温淬火后韧性基本不变。对锰含量较高(0．6%)的球铁延长等温时间,其韧性不断提高(笫二阶段到来前)。在较低等温温度(<350℃)或较长等温时间(120~180min)情况下,可将锰含量放宽至0．6%,而奥—贝球铁的韧性基本不变。
The effect of manganese on the microstructure and properties of austenitic-ductile iron was investigated. Manganese improved the stability of retained austenite, increased the content of retained austenite after isothermal quenching, and delayed the delivery of bainite to the first and second The arrival of the stage. These phenomena are more pronounced when the isothermal temperature is greater than 410 ° C. When the isothermal temperature is less than 350 ℃, the manganese content increases, ductile iron ductile toughness basically unchanged. Ductile iron with higher manganese content (0.6%) prolongs the isothermal time, and its toughness continues to improve (before the second phase is reached). The manganese content can be relaxed to 0.6% at lower isothermal temperatures (<350 ° C) or longer isothermal times (120-180 min), while the ductile properties of the Austroboons remain essentially unchanged.