研究不同热处理工艺对一种粉末冶金镍基高温合金组织性能的影响。从两种工艺热处理的俄罗斯的该类合金盘件上部分截取试样并进行了组织性能对比分析。结果表明,在γ＇相完全溶解温度以上固溶处理后,淬火冷却速度和随后的时效方式直接影响γ＇强化相、二次碳、硼化物析出的形貌、尺寸和分布。两种工艺热处理的试样中γ＇强化相和碳、硼化物的不同匹配度决定其各自达到最佳的综合力学性能。二者的室温冲击韧性和650℃,980 MPa条件下的低周疲劳寿命和持久性能水平相当,相比之下,工艺Ⅰ试样的拉伸强度低于工艺Ⅱ试样,但工艺Ⅰ试样的塑性高于工艺Ⅱ。
Effects of different heat treatment processes on microstructure and mechanical properties of a nickel-based P/M superalloy were studied.The samples were sectioned from discs subject to two kinds of heat treatment process,respectively.The results show that after solution heat treatment at temperature above γ′ phase completely dissolved temperature,the following quenching cooling rate and aging processes directly influence the morphology,size and distribution of precipitated γ′ phase,secondary carbides and borides in this alloy.The good comprehensive mechanical properties depend on proper combination of γ′ phase,borides and carbides in the alloy subject to these two kinds of heat treatment process.The similar properties of impact toughness at room temperature,low cycle fatigue（LCF） and stress rupture properties at 650 ℃/980 MPa are obtained for the alloy after the different heat treatments.However,the tensile strength of the alloy treated by processⅠ is lower than that by processⅡ,but its tensile ductility is better for process Ⅰ compared to process Ⅱ.
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