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对复合添加少量Sn和Sb或Sn和Bi的低碳高硫易切削钢做了切削和高温热塑性实验.结果表明:试样在长时间的高速切削条件下刀具后刀面磨损很小,其易切削性能明显优于SAE1215钢.含Sn和Sb的钢样在750～950℃温度范围内塑性较差,在1050～1300℃范围内具有良好的塑性.扫描电镜及能谱分析表明:钢中Sn和Sb元素在晶界、MnS夹杂物内及MnS边界处均存在;大部分的Bi元素附着在MnS夹杂物上,一部分弥散分布在钢的基体中;钢中MnS夹杂主要呈球状和纺锤状.
The cutting and high temperature thermoplastic experiments were carried out on low carbon and high sulfur free-cutting steel with a small amount of Sn and Sb or Sn and Bi added together.The results show that the wear of the flank of the tool is very small under the condition of long-time high-speed cutting The machinability is obviously superior to that of SAE1215 steel.The steel samples containing Sn and Sb have poor plasticity in the temperature range of 750-950 ℃ and good ductility in the range of 1050-1300 ℃ .The SEM and EDS results show that the Sn And Sb elements exist in the grain boundaries, MnS inclusions and MnS boundaries. Most of the Bi elements are attached to the MnS inclusions and some are dispersedly distributed in the steel matrix. The MnS inclusions in the steel are mainly spherical and spindle-shaped.