Advances in Materials Science and Engineering

Research Article

Modeling of the Growth Kinetics of Boride Layers in Powder-Pack Borided ASTM A36 Steel Based on Two Different Approaches

Table 3

Reported values of activation energies for boron diffusion in ASTM A36 steel with other borided Armco iron and steels.
MaterialBoriding methodBoron activation energy (kJ·mol−1)Temperature range (°C)Method of calculationReferences
Armco ironGaseous73.08 (FeB)
120.65 (Fe2B)		800–1000Diffusion model[7]
Armco ironPowder157.5850–1000Diffusion model[27]
AISI M2 steelPaste257.5 (FeB)
210.0 (Fe2B)		920–1000Diffusion model[6]
AISI 1018 steelElectrochemical172.75 ± 8.6850–1000Parabolic growth law[40]
AISI 1026 steelPowder178.4850–1000Diffusion model[3]
AISI 1045 steelPowder180.0850–1000Diffusion model[5]
AISI 8620Plasma paste boriding124.7–138.5700–800Parabolic growth law[41]
AISI 4340 steelSalt bath234.0800–1000Parabolic growth law[42]
AISI D2 steelSalt bath170.0800–1000Parabolic growth law[42]
AISI 1018 steelPowder159.3 (Fe2B)850–1000Diffusion model[31]
AISI D2 steelPowder201.5 (Fe2B)850–1000Diffusion model[33]
AISI P20 steelPowder200 (FeB + Fe2B)800–950Parabolic growth law[43]
ASTM A36 steelPowder161.00 (Fe2B)850–1000Diffusion modelsThis work