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一、前言 单体铸造活塞环因石墨过冷或超长达不到国际要求,用硅铁或结晶硅作孕育剂,其孕育量超过0.2％时产生的铸件皮下气孔的废品也是可观的。我厂从80年起,通过仔细观察和多种实验,发现用稀土硅瞬时孕育对上述问题迎刃而解。使单体环的金相组织几乎百分之百达到国际要求;同时也因铸件皮下气孔的消除而使铸造废品减少到20％左右,经济效果在原来的基础上翻了三番多。这种孕育法安全系较大,铁水浇注温度在1250℃以上都可获得较好的金相组织。
I. Introduction Monolithic casting piston ring due to graphite is too cold or too long reach the international requirements, with ferrosilicon or crystalline silicon as inoculant, the amount of more than 0.2% when the birth of the casting subcutaneous stomatal waste is considerable. I plant from 80 years onwards, through careful observation and a variety of experiments, found that instantaneous breeding of rare earth silicon solved the above problems. The single ring of the microstructure almost 100% to meet international requirements; but also due to the elimination of castings under the skin pores to reduce casting waste to about 20%, the economic effect of more than tripled in the original basis. This kind of inoculation safety system larger, hot metal pouring temperature above 1250 ℃ can get better microstructure.