Influência do teor de molibdênio em ligas ferríticas 9CR-XMO

Abstract

This study evaluates the influence of the high molybdenum content on the microstructure, mechanical properties and weldability of alloy Fe-9Cr-Xmo for application in the oil industry. The solubilized alloys were subjected to microhardness tests, tensile and impact and welded at two different temperatures with and without addition of material, using three energy levels. Analyses of variance of grain size and microhardness in the weld regions to check the effects of variation in the concentration of Cr and Mo and heat input. The results revealed that the different welding conditions employed did not affect the microstructure and hardness of the alloy. The high levels of molybdenum, the low percentage elongation and brittle behavior of these alloys at room temperature indicate that these would be difficult weldability. However, the results show that the performance of the welding of these alloys has been successful.