原始钢锭中含有不可避免的凝固缺陷，并且在核电等大型锻件中，其内部微观组织晶粒度是影响其高韧性能的关键因素。
There are many inevitable defects in raw ingots. And the microstructure is the key factor which affects the high ductility of heavy forgings such as in nuclear power plant.
分析了锻件生产过程中，在锻造、热处理以及炼钢中经常产生缺陷的原因，并提出了预防措施。
Based on analysis on the reasons for the defects in large sized forgings during steel making, heat treatment and, the preventive measures were formulated.
研究发现，锻压过程中合金的流动性整体较好，在锻件头部和杆部边缘处充填性稍差，主要的缺陷也易在这些部位产生。
It is found that the alloy has a better mobility in forging process. Lack of filling occurred in the head and the edges. The main flaw is also easy to produce in these parts.
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