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本文用金相、电子探针和化学分析等方法,研究了W_(14)Cr_4VMn(RE)高速钢中的硫化锰夹杂物。发现它是Ⅲ型,分布情况和碳化物有密切关系。加入稀土元素以后,钢中硫化锰的变化情况较复杂:对于含硫0.002％～0.005％的钢,硫化锰的数量几乎未变;对于含硫0.01％～0.013％的钢,硫化锰的数量随钢中稀土含量增加而减少,但直到Ce/S=12时,也未完全消失。根据试验结果分析,硫化锰对高速钢的热塑性不可能产生多大的危害作用。因此,稀土元素对高速钢热塑性的改善,也主要不是由于它改变了钢中硫化锰夹杂物所引起。
In this paper, the inclusions of manganese sulfide in W_ (14) Cr_4VMn (RE) high speed steel were studied by means of metallography, electron probe and chemical analysis. Found it is type Ⅲ, distribution and carbide are closely related. After the addition of rare earth elements, the variation of the manganese sulfide in the steel is more complicated: the quantity of the manganese sulfide is almost unchanged for the steel containing 0.002% to 0.005% of sulfur; and the quantity of the manganese sulfide is 0.01 to 0.013% Rare earth content in steel increased but decreased, but until Ce / S = 12, it did not completely disappear. According to the test results, it is impossible to find out how much harmful effect the manganese sulfide has on the thermoplastic property of HSS. Therefore, the improvement of the thermoplastic properties of high-speed steel by rare earth elements is not mainly caused by the change of inclusions of manganese sulfide in the steel.