【摘要】 汽车发动机排气岐管所处的使用条件恶劣 ,国内该部件所用材质通常为HT2 50及少量的蠕墨铸铁 ,随着汽车尾气排气标准的不断提高 ,发动机的工作温度愈来愈高 ,传统材质已不能满足为达到环保标准需要的使用性能。本文讨论该材质的应用现状和通过合金化及控制组织来提高材质的使用性能和寿命。更多还原

【Abstract】 Motor engine exhaust manifold, which are usually made of HT250 cast iron and a little ductile iron domestically are used under severe conditions Due to the increased emission standard and operation temperature, the traditional materials can not come up to the standard of environmental protection and desired performance. The application of the new material and its improvement of operation performance and service life by alloying and controlled tissues are discussed in the paper.更多还原