Alloy718 마찰접합조건의 최적화와 비파괴 평가
Optimization of Friction Welded Joint Conditions in Alloy718 and the Nondestructive Evaluation
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초록
Friction welding was performed to investigate mechanical properties for Ni-base superalloy with 15 mm diameter solid bar. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, impact energy test, Vickers hardness surveys of the bond of area and heat affected zone. And then, the nondestructive technique to evaluate the weld quality was carried out by acoustic emission(AE) and ultrasonic attenuation coefficient. The tensile strength of the friction welded joint was shown up to 90 ％ of the Alloy718 base metal under the condition of the heating time over 5 sec. The optimal welding conditions were n = 2,000 rpm, P1 = 200 MPa, P2 = 200 MPa, t1 = 8 sec and t₂ = 5 sec when the total upset length was 4.4 mm
Abstract
Friction welding was performed to investigate mechanical properties for Ni-base superalloy with 15 mm diameter solid bar. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, impact energy test, Vickers hardness surveys of the bond of area and heat affected zone. And then, the nondestructive technique to evaluate the weld quality was carried out by acoustic emission(AE) and ultrasonic attenuation coefficient. The tensile strength of the friction welded joint was shown up to 90 ％ of the Alloy718 base metal under the condition of the heating time over 5 sec. The optimal welding conditions were n = 2,000 rpm, P1 = 200 MPa, P2 = 200 MPa, t1 = 8 sec and t₂ = 5 sec when the total upset length was 4.4 mm
참고문헌 (10)
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