The Formation of Surface Nanoparticles Enhances the Vacuum Carburizing Efficiency of 20CrMnTi Steel
Fangpo Li, Jianjun Wang, Lihong Han, Caihong Lu, Zhuocheng Li
TL;DR
Pre-treating 20CrMnTi steel with nitriding improves vacuum carburizing efficiency, resulting in a harder and deeper hardened layer.
Contribution
The study reveals that pre-nitrocarburizing enhances vacuum carburizing by forming surface nanoparticles that increase carbon diffusion.
Findings
Pre-nitrocarburizing increases the effective hardening depth by approximately 0.15 mm.
Surface hardness improves by about 75 HV due to enhanced carbon diffusion from surface nanoparticle formation.
Abstract
This work investigates the effect of pre-nitriding treatment before vacuum carburizing on the carburizing efficiency of 20CrMnTi steel. The results show that pre-nitrocarburizing significantly enhances the vacuum carburizing efficiency of 20CrMnTi steel, refines the microstructure of the carburized layer’s martensite, and promotes the precipitation of carbides. At the same carburized layer depth, the hardness and carbon content of the pre-nitrocarburized samples are significantly higher than those of the samples without pre-nitriding. Specifically, the effective hardening depth and surface hardness increase by approximately 0.15 mm and 75 HV, respectively. These improvements are attributed to the formation of loose and porous nanoscale nitride particles on the surface during the pre-nitrocarburizing process, which significantly increases the surface roughness and porosity. This surface…
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Taxonomy
TopicsMetal and Thin Film Mechanics · Microstructure and Mechanical Properties of Steels · Surface Treatment and Residual Stress