EFFECT OF B ON HOT WORKABILITY OF FE-36-P ERCENT-NI ALLOY

Effect of B addition on hot workability of Fe-36%Ni alloy has been stu died by means of hot tensile tests, micro hardness tests and physical analyses of fractured surface. Addition of 0.002 approximately 0.004%B was effective on improving hot workability as well as preventing slig htly grain boundary oxidation. It was clarified by Auger Electron spec trometer 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 segrega tion and grain boundary oxidation, the mechanism of improvement in hot workability of Fe-36%Ni alloys by B addition has been discussed.