Residual stresses in steel after boriding from melts

Characterization of AISI 4140 borided steels

“…As a consequence, a thermally induced compressive strain had to be imposed to the layer to attach the layer onto the substrate at the temperature below the boriding temperature [28]. Also, as stated by Babushkin and Polyakov [29], the magnitude and distribution of residual stresses depend, to a considerable extent, on the phase composition of the boride coating, the technique of the layer production, and the process parameters. The experiments performed have shown (Fig.…”

Enhanced Surface Hardness by Boron Diffusion in Martensitic Stainless Steel via Cathodic Reduction and Thermal Diffusion Based Boriding (CRTD-Bor)

“…While cooling down after the boriding treatment, high tensile stresses develop in the FeB phase and compressive stresses in Fe 2 B. Therefore extensive micro and macro cracks parallel to the boride phases (FeB and Fe 2 B) form [4][5][6][7][8]. Consequently, single Fe 2 B boride layer is more desirable than a dual-phase FeB-Fe 2 B layer.…”

Effects of process current density and temperature on electrochemical boriding of steel in molten salts

“…[3][4][5][6][7][8][9][10][11][12][13][14] Nevertheless, electrochemical boriding produces thicker coating in shorter times as compared to the thermochemical boriding techniques. [3][4][5][6][7][8][9]15 Matiasovsky et al 7 reported formation of FeB and Fe 2 B phases on the boride layer, deposited above the critical current density in electrochemical boriding.…”