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用球墨铸铁制造活塞环,国际上广泛应用于强化发动机还只有十多年的历史。随着我国改革开放,国外汽车技术的引进、对球墨铸铁活塞环的要求量日益增加,国内已有许多厂家生产这种活塞压。在这种情况下,1991年6月起,上海内燃机研究所开始着手制定球墨铸铁活塞环的金相检验国家标准,我厂承担了“珠光体球铁环中铁素体对性能影响”的试验验证工作,要求就铁素体≤15％范围内对性能的影响进行验证。 铁素体由于硬度低,强度小,在活塞环中历来是作为一种有害组织进行严格控制的,对铁素体的危害,及其含量的控制范围,不仅主机厂敏感,活塞环生产厂家也存有疑虑,究竟铁素体在球铁环中有何影响?应限制在那个范围内比较合适?这是有争议的问题,也是制定
Piston ring made of ductile iron, widely used in the world to strengthen the engine only 10 years of history. With China’s reform and opening up, the introduction of foreign automotive technology, the demand for ductile iron piston rings is increasing, many domestic manufacturers have produced this piston pressure. Under such circumstances, starting from June 1991, Shanghai Internal Combustion Engine Research Institute started to work out the national standard for the metallographic examination of nodular cast iron piston rings. Our factory undertook the experimental verification of “the influence of ferrite in the pearlite iron ring on the performance” Work, to verify the impact on performance within ferrite ≤15%. Due to the low hardness and low strength, ferrite has always been strictly controlled as a kind of harmful tissue in the piston ring. The damage to the ferrite and the control range of its content are not only sensitive to the host plant, but also the piston ring manufacturers There are doubts as to what is the effect of ferrite in the ferrule? It is more appropriate to limit the scope of the ferrite. This is a controversial issue,