粉末高温合金等温锻造过程非金属夹杂物的变形特征

Deformation Character of Non-metallic Inclusions in Powder Superalloy During Isothermal Casting

采用人工加入陶瓷夹杂物的方法,研究了FGH96粉末高温合金中SiO2、混合物两种非金属夹杂物在等温锻造前后的特征,研究表明,非金属夹杂物在等温锻造的过程中发生了一定的变形,夹杂物沿变形方向被压扁。SiO2与基体存在一定的反应过渡区,变形量大时会发生破碎,碎块随着变形金属的流动而被拉开;混合夹杂物的形状极不规则,整个夹杂物位于几个粉末颗粒的交界处,严重破坏了基体的连续性。

The character of two kinds of artificial non-metallic inclusion in P/M FGH96 alloy in isothermal deformation was researched by mix in ceramics inclusions artificial. The results show that non-metallic inclusions are deformed during i sothermal casting, the inclusions are squashed along with the deforming direction. There is a reaction zone at the interface between the SiO2 particle and the matrix. The SiO2 particles will be broken up when the deformation degree is large enough in P/M FGH96. The shivers are dispersed with the flow of alloy. The shape of mixed inclusions is irregular. And the mixed inclusions are distributed at the boundary of the powder particles, these inclusions destroy the continuity of the matrix.