热等静压工艺生产高强韧球墨铸铁件

Using Hot Isostatic Pressing Process to Produce High Strength High Toughness Nodular Iron Casting

介绍了热等静压生产工艺及作用,详细阐述了高压泵泵体铸件的生产工艺:采用水平分型无箱造型线造型;中频炉熔炼,严格控制铁液化学成分;采用Fe Si Mg8RE5球化剂,BS-1型Si-Ba孕育剂;盖包冲入法进行球化处理;铸件浇注后进行热等静压工艺处理。生产结果显示,铸件的金相组织为44.97%铁素体+42.28%珠光体+12.55%球状石墨,铁素体、珠光体与球状石墨组织分布均匀,石墨球更趋圆整;铸件的强韧性、硬度以及抗疲劳强度有了较大的提升,符合技术要求。

The hot isostatic pressing process and its effect was introduced,and the production process of the high pressure pump body casting was described in details as follows：moulding on horizontal flaskless moulding line;melting in medium frequency furnace with strict controlling chemical composition of the iron melt;using Fe Si Mg8RE5 as the nodularizing alloy,using BS-1type of Si-Ba alloy as the inoculant;using tundish cover ladle pour-over process to conduct nodularizing treatment;treating the poured casting with hot isostatic pressing process. As the result of production,the final microstructure of the casting was consisted of 44.97% ferrite ＋ 42.28% pearlite ＋12.55% graphite nodules,the ferrite,pearlite and graphite nodules distributed uniformly,the graphite nodules became more round;the strength,toughness,hardness and fatigue resistance of the casting has been enhanced quite obviously and met technical requirements.