Liquid-Copper/Zinc Embrittlemeht in Alloy 718

摘要

Welding of Alloy 718 is known to cause intergranular cracks in the weld heat-affected zone (HAZ). In this work, an Alloy 718 sample that exhibited HAZ cracking revealed high Cu/Zn concentrations on the fracture surface. Previous studies on HAZ cracking of Alloy 718 have not reported high Cu/Zn concentrations on the fracture surface. It is proposed here that the presence of liquid Cu/Zn can cause liquid-metal embrittlement (LME) and HAZ cracking in Alloy 718.