Abstract
Effect of B addition on hot workability of Fe-36%Ni alloy has been studied by means of hot tensile tests, micro hardness tests and physical analyses of fractured surface. Addition of 0.0020.004%B was effective on improving hot workability as well as preventing slightly grain boundary oxidation. It was clarified by Auger Electron spectrometer that hot workability was greatly affected by S segregation at grain boundaries, which could be decreased by segregation of B. From the view of diffusion of B and S, grain boundary cohesion by B segregation and grain boundary oxidation, the mechanism of improvement in hot workability of Fe-36%Ni alloys by B addition has been discussed.
