【摘要】 在实验室进行了1kg坩埚实验,研究了中碳高硫结构钢钙处理前后夹杂物的形态、尺寸及组成.结果表明:钢钙处理后获得了可以改善钢切削性的纺锤形夹杂物,夹杂物的平均纺锤形率为68.11%,并且随钢中[Ca]/[S]增加夹杂物纺锤形化趋势增加;钙处理后小于2.5μm的夹杂物占夹杂物总量的76.05%,夹杂物细小、弥散分布于钢基体中;夹杂物类型以钙铝酸盐芯硫化物外壳的复合夹杂物、(Mn,Ca)S形式的硫化物为主,有少量的铝酸钙与CaS的复合夹杂物;含钙硫的45钢铸态钢锭比普通45钢铸态钢锭切削性能有所改善.更多还原

【Abstract】 The 1 kg crucible experiment was carried out in laboratory.The shape,size and composition of inclusions in medium-carbon high-sulphur structural steel were investigated.The results show that fusiform inclusions,which can improve the cutability of the steel,account for 68.11% in total inclusions,and the ratio of fusiform inclusions increases with increasing [Ca]/[S].After calcium treatment the inclusions is very tiny,inclusions of less than 2.5 μm in size account for 76.05% and scattered in the matrix of the steel.The inclusions are mainly composed of(Mn,Ca)S sulfide and complex inclusions in which the core is calcium aluminate and the shell is sulfide.There are small amount of complex inclusions of calcium aluminate and calcium sulfide in the inclusions,too.The cutability of the ingot steel containing sulphur and calcium is better than that of middle carbon steel.更多还原