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研究了不同锰含量对高铁铝硅合金组织及力学性能的影响。利用XRD和金相显微镜分析了铸态及800℃高温热处理后合金中不同金相组织;研究了锰含量对铸态下的高铁铝硅合金抗拉强度的影响。结果表明:800℃高温热处理后,合金中的富铁相只存在Al3FeSi2,随着保温时间的延长,初生硅转变为变异的五瓣星形状和极其粗大的板条形状;当含量Mn/Fe=0.6时,抗拉强度达到最大值148 MPa。
The effects of different manganese contents on microstructure and mechanical properties of high iron-aluminum-silicon alloy were studied. The different microstructure of the alloy after as-cast and 800 ℃ high-temperature heat treatment was analyzed by XRD and metallographic microscope. The effect of manganese content on the tensile strength of the as-cast Fe-Al-Si alloy was studied. The results show that Al3FeSi2 exists only in the iron-rich phase of the alloy after the high-temperature heat treatment at 800 ℃. As the holding time prolongs, the primary silicon transforms to the deformed five-star shape and the extremely coarse slab shape. When the content of Mn / Fe = 0.6, the tensile strength reached a maximum of 148 MPa.