WELDING ON CONTACT SURFACES IN DIFFERENT TECHNOLOGICAL VARIANTS OF THE HOT PLASTIC WORKING OF P/M MATERIALS

In this study of IGWSs it was necessary to distinguish submicropores from inclusions (of, e. g. , oxides) of sizes of the same order. For this purpose, the microscope was operated as a microdiffractometer. When an element of structure morphology gave a diffraction picture, it was regarded as an inclusion of a second phase, and when no diffraction was observed, as a micropore. This investigation has established which processing factors influence the working of a material with intragranular welding at IGWSs. Apart from the degree of thermomechanical action they include the shape of the powder particles, the mode of deformation, and the environment in which all the stages of the process are carried out. To obtain the best results, atomized powders should be used and pressing should be performed under conditions of shear strains and in a vacuum.