经分析表明，稀土铝合金化可以明显改善H13钢顶头的铸造性能，消除了中心缩孔现象，并细化了晶粒和碳化物，降低了S、P含量。
The results of the research show that Re-Al alloying improves the casting property of H13 steel, eliminates central pipe, refines grains and carbides, reduces the amount of S and P.
变质处理是改善共晶碳化物形态和分布，扩大铸造高速钢应用的有效途径。
The modification is an effective channel for improving of the eutectic carbide shape and distribution, and enlarging the application of the cast HSS.
采用砂型和金属型铸造制备m 2高速钢铸锭，研究了冷却速度变化对高速钢m 2c共晶碳化物形态及性质的影响，探讨了M2C共晶碳化物形态变化的机理。
The cast ingots prepared using sand mould and metal mould were analyzed to investigate the effect of cooling rates on morphologies and characters of M2C eutectic carbides in M2 high speed steel.
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