Evolution of thermal stress in a coating/substrate system during the cooling process of fabrication

Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

“…As reported in the literature, the physical properties of both, the substrate and feedstock used for the coating deposition, have a strong influence on the resulting stress state [78][79][80]. Song et al [79] showed that the magnitude of thermal stress decreases with an increasing preheating temperature of the substrate.…”

“…Song et al [79] showed that the magnitude of thermal stress decreases with an increasing preheating temperature of the substrate. Oladijo et al [80] found that a strong link exists between the stress field in the coating and the physical properties of the substrate, as its CTE relative to that of the substrate, plays a significant role.…”

Evaluation of the effect of boride layer structure on the high temperature wear behavior of borided steels

“…In spite of their superior performance at RT, there is a risk of cracking and/or degradation for the surface layers at elevated temperatures arising from generated thermal stress which is in addition to the external working stress [2]. Generally thermal stress develops as the result of the mismatch in the thermal expansion coefficients between surface layer and the substrate [3][4][5]. If the thermal expansion coefficient of the substrate is larger than that of the surface layer, it expands more than the surface layer during heating and therefore leads to generation of tensile type thermal stress at elevated temperatures.…”

“…Unlike tensile thermal stress, compressive thermal stress is beneficial in retardation of crack initiation and/or propagation at surface layer [3,7]. In this respect, a number of scientific investigations have been made to control the thermal stress by altering the structure of the surface layers (multilayered, gradient and composite nature) formed by deposition techniques [4][5][6][8][9][10][11][12][13]. When thermochemical diffusion processes are of concern, boriding results in the formation of single (Fe 2 B) or dual-phase (Fe 2 BþFeB) surface layers on ferrous alloys depending on the process parameters [14,15].…”

Effects of coating spray speed and convective heat transfer on transient thermal stress in thermal barrier coating system during the cooling process of fabrication

“…The above thermal stress models are based on the temperature difference between the initial and final states of the system. Although the thermal stress during cooling process of fabrication has been studied in the previous literature [22], there is no explicit expression for the transient thermal stress in YSZ coating and the shear stress at the edges of YSZ-S interface during the cooling process of fabrication. On the other hand, all the above models have not considered the effects of spray speed of YSZ coating and the convective heat transfer between the YSZ coating and the environment.…”