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以氮气为雾化气体采用喷射成形工艺制备了FGH4095高温合金沉积坯,记录了沉积过程坯体表面温度曲线,并采用定量金相法、排水法测试了坯体致密度,观察了坯体晶粒及γ’相的形貌.结果表明采用氮气作为雾化介质进行喷射成型喷射沉积坯基体致密度可达99%以上,但也存在着较大的(1—2μm)的气孔,经热等静压和近等温锻后宏观气孔闭合,氮以尺寸不超过1μm的碳氮化物形式存在.喷射沉积坯以等轴晶组织为主,坯体内部平均晶粒尺寸约为20-40μm,近表面区域晶粒较细,约为13μm;一次γ’相多数呈尺寸约0.3—0.5μm不规则块状形貌.喷射成形坯组织结构的形成与喷射成形过程的降温过程有密切关系.
FGH4095 superalloy blank was prepared by spray molding with nitrogen as atomizing gas. The surface temperature curve of the blank was recorded. The density of the blank was tested by quantitative metallography and drainage test. ’Phase morphology.The results show that the use of nitrogen as the atomization medium jet spray deposition billet matrix density up to 99%, but there is also a large (1-2μm) pores, the hot isostatic pressing and The macro-pores closed after isothermal forging, and the nitrogen exists in the form of carbonitrides with sizes up to 1μm.The spray-deposited billets mainly consist of equiaxed grains with an average grain size of about 20-40μm in the green body and the near-surface grain size Thinner and about 13μm.The primary γ’phase appeared in the shape of irregular block with the size of 0.3-0.5μm.The formation of the structure of the sprayed blank was closely related to the cooling process of the spray forming process.