【摘要】 通过粉末冶金热等静压工艺制备了一种新型氧化物弥散强化(ODS)镍基高温合金，对其进行不同工艺参数的热加工(热锻、热轧),随后结合扫描电镜、透射电镜等对其组织进行表征，并对合金拉伸性能进行测试，研究组织演变对拉伸性能的影响。结果表明：新型ODS镍基合金适宜的热加工温度区间为1040～1140℃。热轧时，晶粒尺寸随总变形量增加而减小，随轧制温度升高而增大，微米级Y-Zr金属间化合物颗粒与纳米级Y-Zr-O颗粒随轧制参数变化未发生明显变化。1140℃锻造态合金总变形量最大，晶粒最细，纳米级Y-Zr-O颗粒虽未发生显著变化，但部分Y-Zr金属间化合物颗粒严重粗化。与热等静压态合金相比，轧制后合金的塑性提升了一倍以上，最大断后伸长率达40.9%,1140℃锻造态合金的强度最高，达1086 MPa。更多还原

【Abstract】 A novel oxide dispersion strengthened(ODS) Ni-based superalloy was fabricated via powder metallurgy and hot isostatic pressing(HIP), followed by hot working(forging and rolling) under different process parameters. The microstructure was characterized by using scanning electron microscope(SEM) and transmission electron microscope(TEM), and the tensile properties were tested to investigate the effect of microstructural evolution on mechanical properties. The results indicate that the optimal hot working temperature range for the tested novel ODS Ni-based alloy is 1040-1140 ℃. During hot rolling, the grain size decreases with increasing total deformation, but increases with higher rolling temperature. The micron-scale Y-Zr intermetallic particles and nano-scale Y-Zr-O particles show no significant change under varying rolling parameters. When forged at 1140 ℃, the alloy exhibits the highest total deformation and finest grain size, while the nano-scale Y-Zr-O particles remain largely unchanged, while some Y-Zr intermetallic particles undergo severe coarsening. Compared with the HIPed alloy, the plasticity of the rolled alloy is more than doubled, with a maximum elongation after fracture of 40.9%. The strength of the alloy forged at 1140 ℃ is the highest, reaching 1086 MPa.更多还原