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本文对三种不同含碳量的IN100粉末高温合金进行了研究。指出氩气雾化粉末是“糊状凝固”的十多个枝晶构成的球体。粉末晶粒度和粒度在一定温度范围内存在指数关系。粉末枝晶间和表面存在凝固偏析。粉末在加热过程中存在 MC+γ→M_(23)C_6+γ′碳化物转变。加热过程促进了Ti、Cr,Mo,Al元素在晶界和表面的偏聚,这种偏聚和富Mo的一次MC相的溶解是造成PPB沉淀的主要原因。采用1100℃预热等静压抑制溶质元素表面偏析和富Mo一次MC相的溶解可以改善压件PPB的结构和性能。
In this paper, three kinds of IN100 powder superalloy with different carbon content were studied. It is pointed out that the argon atomized powder is a spheroid composed of more than ten dendrites in “pasty solidification”. There is an exponential relationship between grain size and grain size over a range of temperatures. Solidification segregation exists between the powder dendrite and the surface. There is MC + γ → M_ (23) C_6 + γ’carbide transformation in the powder during heating. The heating process promoted the segregation of Ti, Cr, Mo and Al elements at the grain boundaries and the surface. This segregation and dissolution of the first Mo-rich MC phase were the main reasons for the precipitation of PPB. Preheating isostatic pressing at 1100 ℃ suppresses the segregation of solute elements and the dissolution of Mo-rich primary MC phase, which can improve the structure and properties of PPB.