The production of non-weldable nickel-based superalloys,especially single-crystal superalloys,is important for additive manufacturing.Single-crystal specimens of non-weldable nickel-based superalloys were produced by ...The production of non-weldable nickel-based superalloys,especially single-crystal superalloys,is important for additive manufacturing.Single-crystal specimens of non-weldable nickel-based superalloys were produced by electron beam selective melting using an IN-738 alloy.In this study,single-crystal nickel-based superalloy specimens of diff erent sizes were prepared by a multiple preheating process and tight control of the melting parameters without the need for a grain selector or single-crystal seed for the first time.Electron backscattered diff raction measurements were performed to confi rm the presence of a single crystal.The transition boundaries between the polycrystalline and single-crystal regions at the edges and bottom of the samples were characterized to analyze the formation of single crystals.展开更多
基金financial support from the National Key R&D Program of China(No.2017YFB1103300)。
文摘The production of non-weldable nickel-based superalloys,especially single-crystal superalloys,is important for additive manufacturing.Single-crystal specimens of non-weldable nickel-based superalloys were produced by electron beam selective melting using an IN-738 alloy.In this study,single-crystal nickel-based superalloy specimens of diff erent sizes were prepared by a multiple preheating process and tight control of the melting parameters without the need for a grain selector or single-crystal seed for the first time.Electron backscattered diff raction measurements were performed to confi rm the presence of a single crystal.The transition boundaries between the polycrystalline and single-crystal regions at the edges and bottom of the samples were characterized to analyze the formation of single crystals.
