2218 Ni基鍛造材,鋳造材からなる摩擦圧接材の強度へ及ぼす微視組織の影響(J10-3 溶接接合強度評価,J10 締結・接合部の力学とプロセス)

概要

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To develop the compact and high reliable micro gas turbine rotor structure, turbine wheel and rotor stacking shaft were integrated by friction welding. And the characteristic strength of friction welding joints made of Ni-based cast alloy, MM247LC, Ni-based forged alloy, IN718, were investigated. 0.2% proof strength and rupture elongation of MM247LC were lower than IN718 and tensile strength of MM247LC was lower than that of interface or IN718. And Creep rupture occurred at the boundary between Nb depleted band and fine grain band of IN718. Moreover, fatigue strength decreased remarkably by the effect of welding defects at the interface, so it is considered to be very important to optimize the welding process to keep reliability of friction welding joints.
社団法人日本機械学会の論文
2005-09-18