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采用粉末冶金法制备Ni-20Cr-4Mo-0.15C和Ni-20Cr-4Mo-0.15C-12.85TiC-3TiN(质量分数,%)两种合金,研究Ti(C,N)质点引入对Ni基高温合金组织结构、力学性能和800℃抗氧化性的影响。结果表明,经1280℃真空烧结1h后,因12.85%TiC和3%TiN引入形成的Ti(C,N)质点,弥散分布于奥氏体基体的晶内和晶界处,使奥氏体基体晶粒明显细化,合金的密度从8.38g/cm3降至7.59g/cm3,维氏硬度从1850MPa升至3430MPa,抗拉强度从752MPa升至1192MPa。此外,合金在800℃空气中仍具有较好的抗氧化性,形成的氧化膜主要由α-Cr2O3和TiO2组成。
Ni-20Cr-4Mo-0.15C and Ni-20Cr-4Mo-0.15C-12.85TiC-3TiN (mass fraction,%) were prepared by powder metallurgy. The effect of Ti (C, N) Alloy structure, mechanical properties and oxidation resistance at 800 ℃. The results show that Ti (C, N) particles formed by the introduction of 12.85% TiC and 3% TiN dispersed in the intragranular and grain boundaries of the austenite matrix after vacuum sintering at 1280 ℃ for 1h, The grain size is obviously refined, the density of the alloy is reduced from 8.38g / cm3 to 7.59g / cm3, the Vickers hardness is increased from 1850MPa to 3430MPa, and the tensile strength is increased from 752MPa to 1192MPa. In addition, the alloy still has good oxidation resistance in air at 800 ° C, and the oxide film formed mainly consists of α-Cr2O3 and TiO2.