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研究了W9高速钢的电磁连续铸造工艺和铸坯的凝固组织特征,并与普通的模铸高速钢中共晶碳化物的类型和分布情况进行了比较,测定了在不同制备条件下高速钢莱氏体网的厚度和凝固冷却速度。结果表明:电磁连续铸造得到的高速钢铸坯表面光滑、振痕轻微、外观形状规整、内部组织致密无缺陷,莱氏体网明显变薄,晶粒明显细化;M2C和MC型碳化物的析出量增多,M6C型碳化物的析出量减少,合金碳化物变得细小、均匀和弥散;铸坯边部的凝固冷却速度为3.4×104K/s,r/2处为6.5×103K/s,心部为3.9×102K/s,冶金质量明显优于普通模铸。
The electromagnetic continuous casting process of W9 high-speed steel and the solidification microstructure of slab are studied. The types and distribution of eutectic carbide in common die-casting high-speed steel are compared. The thickness of the network and the solidification cooling rate. The results show that the surface of the high speed steel slab obtained by electromagnetic continuous casting has smooth surface, slight vibration mark, regular appearance and shape, dense internal structure without defects, obvious thinning of the ledeburite web and obvious grain refinement. The M2C and MC type carbide The amount of precipitates increased, the amount of M6C carbide precipitates decreased, and the alloy carbides became fine, uniform and dispersed. The solidification cooling rate at the edge of slab was 3.4 × 104K / s and 6.5 × 103K / s at r / 2, Heart of 3.9 × 102K / s, metallurgical quality significantly better than ordinary mold.