研究了庆铸铁中含有1.2%以下的铌时所形成的铌化物的存在形态，及其对组织与硬度的影响。
The morphology of niobium compound of the gray iron with less than 1.2% of niobium addition and its influences on the structure and hardness were investigated.
铌化物是在凝固过程中形成，具有细化奥氏体晶粒的作用，并分析研究了铌细化高锰钢奥氏体晶粒的机制。
The results indicate that niobium compounds form during solidification, leading to the refinement of austenite grains. The mechanism of grain refinement has been investigated extensively.
研究了铌对M2高速钢的共晶碳化物组织和共晶碳化物高温球化的影响。
The effect of Nb on the as-cast microstructures and the prespheroidization at elevated temperature of eutectic carbides of M2 high speed steel was studied.
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