Finite element simulation of thermal stress on brazed K24 nickel-based joint

By means of finite element method, maximum value of thermal stress and stress concentration zones of K24 nickel-based alloy joint brazed at 1 270℃ were simulated in this paper.The results show:during cooling process, the shear stress of K24 alloy joint concentrates at the interface tip and the maximum value of the shear stress appears at the right tip of Ni-based brazing alloy/K24 alloy interface, which decreases and then increases during cooling process.At the same time, the maximum value of stress in x direction of K24 alloy joint also appears on this site, which changes from negative to positive during cooling.After the temperature declines to room temperature, the joint seldom fractures in brazing alloy.Ni-based brazing alloy/K24 alloy interface easily becomes fracture zone as external force acts on the joint.