The structure, phase composition, and residual stresses of diffusion boride layers formed by thermal-chemical treatment on the die steel surface

OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 23 No. 2 2021 Fig. 4. The device (metrological frame) of the UDION-2/УДИОН-2 in - stallation for the study of residual stresses in flat samples during the elec - trochemical method of removing layers Fig. 3. Samples-strips after boriding for determination of residual stresses by mechanical method: а – 950 °С, 2 h; б – 1050 °С, 2 h a b