钼和铬的添加对Fe_3Al基合金力学性能的影响

Effect of Molybdenum and Chromium Additions on the Mechanical Properties of Fe_3Al-Based Alloys

研究了Mo和Cr的复合添加对Fe3Al基合金室温和 6 0 0℃高温下的力学性能的影响 .结果表明将Cr和Mo一起加入到Fe3Al基合金中 ,可以明显提高其在 6 0 0℃下的屈服强度和蠕变寿命 ;添加Cr到Fe3Al中会降低Mo的固溶度 ;在含有 1%Mo以上的Fe 2 8Al (2～ 5 )Cr合金中形成了具有复杂成分的沉淀相 ;随着加入到Fe 2 8Al (2～ 5 )Cr合金中Mo含量的增加 。

The effects of combined additions of molybdenum and chromium on mechanical properties of Fe 3Al based alloys at ambient temperature and high temperature of 600?℃ have been investigated. A combined addition of molybdenum and chromium to Fe 3Al based alloys results in a significant improvements of yield strength and creep rupture life at the temperature of 600?℃. The chromium addition to Fe 3Al based alloys decreases the solubility of molybdenum. Precipitates with complex composition form in the Fe 28Al (2-5)Cr alloys which containing more than 1% molybdenum. With the increase of molybdenum addition to the Fe 28Al (2-5)Cr alloys, the fracture mode changes from a mixed one of transgranular cleavage and intergranular failure to entire transgranular cleavage.