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采用光学显微镜、X射线衍射仪和INSTRON5882材料试验机研究了加入量为0.12%的Sr与不同含量的RE(RE含量分别为0、0.12%、0.24%、0.36%、0.48%和0.60%)复合加入对Fe含量为1.2%的ZL101合金组织和性能的影响。结果表明,在Sr加入量一定的情况下,适量RE与Sr复合变质可明显地改善高铁ZL101合金中的针片状β-Fe相形貌,使其由针状转变为细小的短棒状。同时,可以细化α-Al晶粒,T6热处理使共晶硅变为颗粒状。适量RE能提高Sr变质高铁ZL101合金的抗拉强度,但对其伸长率的提高不明显。当Sr含量为0.12%,RE含量为0.36%时,高铁ZL101合金在T6热处理态下的抗拉强度最大值为213MPa,比对应的铸态168MPa,提高了26.8%。
The microstructure of the composites was studied by optical microscope, X-ray diffractometer and INSTRON5882 material testing machine. The addition of 0.12% Sr and RE with different contents of RE (0,0.12%, 0.24%, 0.36%, 0.48% and 0.60%, respectively) Effect of addition on microstructure and properties of ZL101 alloy with Fe content of 1.2%. The results show that the proper modification of RE and Sr can obviously improve the morphology of the needle-like β-Fe phase in the high-speed rail ZL101 alloy from needle-like to short-short rod with a certain amount of Sr added. At the same time, the α-Al grains can be refined, and the T6 heat treatment causes the eutectic grains to become granular. The amount of RE can improve the tensile strength of Sr-deteriorated high-speed railway ZL101 alloy, but its elongation is not obvious. When the Sr content is 0.12% and the RE content is 0.36%, the maximum tensile strength of the high-speed ZL101 alloy under T6 heat treatment is 213MPa, which is increased by 26.8% than the corresponding as-cast 168MPa.