干式缸体炉前蠕化处理工艺及其力学性能

Furnace front vermicularizing treating process and mechanical properties of dry-type cylinder block

为了满足“东方红100”系列柴油机蠕墨铸铁缸体生产的技术要求,通过采用自行研制的新型蠕化剂和蠕化工艺,炉铁液浇注阶梯试样和Y型试样,分别测定蠕墨铸铁的机械性能和石墨形态,分析了不同工艺条件下蠕墨铸铁的蠕化处理效果、化学成分与机械性能之间的关系.研究结果表明,当蠕化剂加入量在1.0％～1.6％时,残余镁的质量分数为0.018％～0.025％,残余稀土的质量分数为0.035％～0.069％,蠕化率能达到50％～80％;蠕虫状石墨分布均匀,抗拉强度达到了380～420 MPa,铸造性能优良,为柴油发动机缸体稳定生产奠定了理论基础.

To meet the technical requirement of the production of diesel engine cylinder block ＂Dongfanghong 100＂ series,a series experiments were conducted by self-made vermicular agent and new vermicularizing treating process.The step samples and Y-block were poured for mechanical properties test and the graphite morphology observation.The relations between vermicularizing effect,chemical composition and mechanical properties were analyzed in different process.The results indicate that 50％-80％vermicular graphite with 0.018％-0.025％ magnesium and 0.035％-0.069％ rare-earth element remains can be obtained by crushing 1.0 ％-1.6 ％ self-made vermicular agent ; then even distribution of compacted graphite,380-420 MPa tensile strength and excellent casting performance also can be achieved in this method,which provides theoretical principle to the successful production of compacted graphite iron.