Thermodynamic and kinetic analysis of formation of compound layer during gas nitriding of AISI1018 carbon steel

Kim, Young-Min; Son, Seok Won; Lee, Won-Beom

doi:10.1007/s12540-017-7191-x

Cited by 9 publications

(1 citation statement)

References 7 publications

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“…Generally, a nitrided layer is composed of a top compound layer and a bottom diffusion layer [19]. Since the compound layer is hard and brittle [20][21][22][23][24][25]. Thus, collaborative deformation does not readily occur with the diffusion layer.…”

Section: Introductionmentioning

confidence: 99%

Novel Effect of Post-Oxidation on the Comprehensive Performance of Plasma Nitriding Layer

Ni,

Ma,

Wei

et al. 2024

Coatings

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In order to enhance the comprehensive performance of plasma nitrided heavy load components used in corrosive environments, post-oxidation was conducted under different conditions after plasma nitriding 42CrMo4 steel at 500 °C for 5 h. The results show that an oxide film composed of Fe3O4 and Fe2O3 was formed above the compound layer, resulting in a significant increase in corrosion resistance; the self-corrosion potential was greatly increased from −658.72 mV to −429.23 mV. Meanwhile, it needs to be emphasized that the characteristics of the plasma nitriding layer could be effectively adjusted as expected by post-oxidation. The compound layer thickness decreased from 9.41 μm to 3.62 μm by post-oxidation at 400 °C for 2 h, while the thickness of the effective hardening layer increased from 300 μm to 378 μm. Due to the expected change in the characteristics of the plasma nitriding layer, post-oxidation could simultaneously improve the toughness, hardness, and wear resistance of the samples; the brittleness level decreased from Grade 4 to Grade 1; the surface hardness increased from 765 HV0.05 to 825 HV0.05; and the wear rate decreased from 3 × 10−5 g·m−1·N−1 to 1.19 × 10−5 g·m−1·N−1, illustrating that the wear resistance was greatly improved.

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