Analysis of Boron on microstructure and composition of IC10 superalloy

The microstructure and composition of IC10 superalloy containing B (0 wt% 1.1 wt%) were studied in this paper. DSC and microstructure analysis were used to compare the formation process of the microstructure and composition of the IC10 alloy with or without boron content. Precipitation temperatures and sequence of initial phases of IC10 alloys with or without B content were researched. The results shows that the exothermal peaks of formation for γ, MC carbide, (γ+γ') eutectic and secondary γ' phase reveal on DSC cooling curves. The alloys with 1.1% B have amephase component and the formation sequence of six phasesis γ, MC, (γ+γ') eutectic, secondary γ', M3B2 and Ni5Hf in turn. The boron content enhances the volume fraction of M3B2 and (γ+γ') eutectic, decreases the temperature of liquids and solidus and also delays the formation of MC and (γ+γ') eutectic obviously. (paper)