Study on shear fatigue damage behavior and evolution of Fe-Pb thin walled heterogeneous welded material components under hot isostatic pressure

Abstract

For the first time, 45 steel and Pb were welded to form Fe-Pb thin-walled heterogeneous welding material components, which can be used in heavy-duty and radiation resistant environments. This study conducted comparative shear fatigue tests under different alternating loads under the conditions of hot isostatic pressing (HIP) control technology. The experimental results are as follows: after HIP treatment, there was a significant preference for grain orientation and an increase in grain size in the specimen. At the same time, the fatigue failure mechanism of Fe-Pb thin-walled heterogeneous components changed from brittle of cleavage fracture to quasi cleavage fracture of ductile–brittle mixture. Meanwhile, the cracking mechanism of Fe-Pb thin-walled heterogeneous Welded material components under without HIP and HIP conditions has been revealed. A mapping relationship failure model was established for grain size, grain orientation and distribution, dislocation configuration evolution, and fatigue life. The research results provide effective theoretical support for the fatigue damage behavior of Fe-Pb thin-walled heterogeneous welded material components.