采用粉末冶金技术,以不同质量分数(0%～10%)Y_2O_3为弥散相,用不同的烧结工艺制备出ODS(oxide dispersion strengthened)镍基高温合金,借助XRD,OM,SEM,EDAX研究了氧化物含量和烧结温度对ODS镍基高温合金性能的影响.结果表明:含1.5% Y_2O_3经1260 ℃保温2 h真空烧结的试样具有较佳的综合性能,相对密度为90.9%,抗拉强度为669 MPa.对用不同球磨工艺制备的合金粉末进行XRD物相分析,并从试样断口显微组织、微区成分上分析氧化物含量和烧结工艺对合金力学性能产生影响的机制.
ODS nickel-based superalloys with different contents of Y_2O_3 (mass fraction from 0% to 10%) as dispersion phase were prepared by powder metallurgy (PM) method by different sintering technologies. Effects of oxide content and sintering temperature on the mechanical properties of ODS nickel-based superalloys were studied. Results reveal that the sample with 1.5% Y_2O_3 sintered at 1260 °C for 2 h has optimal comprehensive properties, whose relative density is 90.9% and tensile strength is 669 MPa. The phases of alloy powder prepared by different milling technologies were determined by XRD. The mechanism for the effect of Y_2O_3 content and sintering temperature on the mechanical properties of the ODS superalloys was analyzed through fracture microstructure observation and micro-area chemical composition analysis.
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