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3.4×104 K/s，r/2处为6.5×103 K/s，心部为3.9×102 K/s，冶金质量明显优于普通模铸。
The electromagnetic billet casting technology and solidification structure of W9 high speed steel billet were studied. The type and distribution of eutectic carbides in traditional mold cast ingot and electromagnetic cast billet of W9 were compared, the thickness of ledeburite net and solidification cooling rate were measured. The results indicate that electromagnetic cast billet has smooth surface, shallow oscillation marks, good shape, dense structure without defects. The electromagnetic continuous casting can refine grains, carbides and ledeburite web, promote precipitation of M2C and MC carbides and reduce M6C precipitation. The metallurgical quality of electromagnetic continuous cast billet is much better because the calculated cooling rate was 3.4×104 K/s at periphery, 6.5×103 K/s for r/2 and 3.9×102 K/s at center of billet.
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