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.
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.
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。
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