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采用扫描电镜(SEM)、透射电镜(TEM)、电子探针(EPMA)和高温力学试验机等手段,研究了不同时效温度(200~800℃)对Ni-20Cr-18W-1Mo高温合金的元素晶界偏聚和力学性能的影响。结果表明,硫、磷元素的晶界偏聚临界时间随时效温度升高而缩短;时效温度对元素在晶界和晶内的成分分布有显著的影响;实验合金的抗拉强度和延伸率随时效温度升高而降低。分析发现,硫、磷元素在晶界中的含量随时效温度升高而增大直至两者分别在650和400℃时达到峰值,是合金在200~600℃区间力学性能降低的重要原因。
The effects of different aging temperature (200 ~ 800 ℃) on the microstructure and properties of Ni-20Cr-18W-1Mo superalloy were studied by scanning electron microscope (SEM), transmission electron microscopy (TEM), electron probe (EPMA) and high temperature mechanical testing machine Particle boundary segregation and mechanical properties. The results show that the critical time for the segregation of sulfur and phosphorus in the grain boundaries decreases with the increase of aging temperature. The aging temperature has a significant effect on the composition distribution of the elements in the grain boundaries and grains. The tensile strength and elongation of the alloys at any time Effective temperature decreases. It is found that the contents of sulfur and phosphorus in the grain boundaries increase with the aging temperature until they peak at 650 and 400 ℃, respectively, which is the important reason for the decrease of mechanical properties at 200-600 ℃.