The purpose of the paper was to analyse the effect of diverse heat treatment parameters (normalising and tempering) on mechanical characteristics of 508 x 20 x 90° tube bends made of the 10CrMo9-10 steel manufactured by bending with local induction heating. The research comprised tests of basic mechanical properties and creep at the temperature of 500 °C. With reference to the results thus obtained, it has been established that there is a relationship between mechanical properties of samples and individual features of their microstructure. Heat treatment parameters triggered changes to the microstructure of the bends, compared to an as-delivered tube. These effects included a change of strength characteristics (Rm, Rp0,2) and material creep lifetime, as compared with the tube. Heat treatment at a lower temperature and shorter tempering time assured the longest creep lifetime. It has also been found that the main structural factor determining creep lifetime of bends is grain size.Keywords: 10CrMo9-10 steel, heat treatment, tube bending, mechanical properties, creep
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