摘要
在气雾化Fe-12Cr-2.5W-0.4Ti-0.25Y粉末中添加1%(质量分数)的Fe2O3粉末,经过热挤压-轧制-热处理工艺制得铁基合金,研究添加Fe2O3对铁基合金显微组织和性能的影响。结果表明:添加少量Fe2O3粉能促进合金中粒径为200 nm到5μm的富Ti、Y、Cr和O的第二相颗粒形成;第二相颗粒能够显著细化合金的再结晶晶粒,并促进组织均匀化;添加少量Fe2O3粉可使基体的室温拉伸强度和屈服强度分别从834 MPa和682 MPa提高到1 257 MPa和1 144 MPa,但伸长率却从13%降低至6.5%。颗粒强化和晶粒细化是添加Fe2O3粉末冶金铁基合金力学性能提高的主要原因。
Iron-based alloy was prepared via hot extrusion,hot rolling and annealing by using gas atomized Fe-12Cr-2.5W-0.4Ti-0.25Y powders with mass fraction of 1% Fe2O3 addtion powders.The effect of Fe2O3 addition on microstructure and properties of iron-based alloy was investigated.The results show that formation of Ti-,Y-,Cr-and O-riched particles with size ranging from 200 nm to 5 μm is promoted by Fe2O3 addition.These oxide particles are found to refine the grains and homogenize the microstructure after recrystallisation.The tensile strength and yield strength of experimental alloys increase obviously from 834 MPa and 682 MPa to 1 257 MPa and 1 144 MPa respectively at room temperature after adding Fe2O3,but the total elongation decreases from 13% to 6.5%.The improvement of mechanical properties of Fe2O3 addition iron-based alloy owes to the reforcement of particles and the refinement of grains.
出处
《粉末冶金材料科学与工程》
EI
2011年第4期610-616,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家高技术研究发展计划(863计划)资助项目(2009AA03Z526)
国家自然科学基金资助项目(50634060
50721003)
关键词
铁基合金
FE2O3
第二相
再结晶
iron-based alloy
Fe2O3
second-phase
recrystallisation
