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使用X射线衍射分析仪、扫描电镜、电子拉伸试验机、高温金相显微镜研究了在模壳内壁表面的涂层中添加孕育剂铝酸钴和在真空熔铸过程中施加工频旋转电磁搅拌对K417高温合金真空精密铸件凝固组织和性能的影响。结果表明:采用将在真空熔铸过程中施加150 A的工频旋转电磁搅拌和在模壳内壁表面的涂层中添加孕育剂铝酸钴相复合的方法,可以得到晶粒细化至95μm、断面等轴晶比例达到99%的K417高温合金真空精密铸件。当在电磁搅拌和孕育剂作用下将K417高温合金真空精密铸件的晶粒尺寸从3.45 mm细化至95μm,可以使其粗大等轴晶向细小粒状晶转变,(γ+γ’)共晶的尺寸减小,室温和650℃中温的拉伸性能得到明显改善。
Using X-ray diffraction analyzer, scanning electron microscopy, electronic tensile testing machine, high temperature metallographic microscope to study the coating on the inner surface of the shell wall adding inoculant cobalt aluminate and in the vacuum casting process to impose frequency electromagnetic stirring Effect of K417 superalloy vacuum casting on solidification microstructure and properties. The results show that the grain refinement can be achieved to 95μm with a rotating frequency of 150 A in the process of vacuum casting and the addition of inoculant cobalt aluminate in the coating on the inner wall of the shell. K417 superalloy vacuum precision castings with 99% equiaxed grain ratio. When the grain size of K417 superalloy vacuum precision castings was refined from 3.45 mm to 95 μm under the action of electromagnetic stirring and inoculant, its coarse equiaxed grains could be transformed into fine granular crystals with (γ + γ ’) eutectic The size is reduced, and the tensile properties at room temperature and 650 ℃ are obviously improved.