HEAT-RESISTANCE OF ALLOY VT18U SUBJECTED TO ION-BEAM ALLOYING

By electron Auger spectroscopy, x-ray diffraction analysis, and exoelectron emission we investigated the physicochemical state of the surface layers of specimens of alloys VT18U after ion alloying with B+, N+, C+, Pd+, and La+, diffusion annealing, and static heat-resistance tests (holding in air at 550-degrees-C for 200 h). It is shown that ion-beam treatment can modify the surface layers of all VT18U approximately 0.3-mu-m thick in which processes of formation of defects, aggregation, and association occur, which leads to a change of the heat resistance of the material. The heat resistance of the alloy increases after alloying with B+, C+, N+, and La+, and decreases after implantation of Pd+. The obtained data are discussed from the positions of the start and inertia mechanism of failure of ion-alloyed parts made of heat-resistant materials.