Development of AIH-FPP Carburizing Process Using Carbon Powder

Abstract

In this study, the surface of industrial pure iron was treated with atmospheric-controlled induction heating fine particle peening (AIH-FPP) using mechanical coating (MC) particles of carbon/steel obtained by mixing carbon powder and fine steel particles using mechanical milling. The surface modification effect and the mechanism of its effect were examined and considered by analyzing of the treated surface. Results showed that a modified layer in which carbon elements were diffused was formed near the treated surface by the AIH-FPP treatment using MC particles. In addition, by examining the influence of the treatment conditions on the formation of the modified layer by the design of experiments, the treatment temperature showed the most significant influence among the treatment temperature, peening time, and gas flow rate. The higher the treatment temperature, the deeper the carbon diffused layer. In addition, when treated at ²1273 K, the microstructure near the surface became pearlite, and Vickers hardness increased. The time required for carbon diffusion in the AIH-FPP carburizing process using MC particles of carbon/steel was approximately the same as that of a general carburizing treatment using a reactive gas. In the AIH-FPP carburizing process, carbon is considered to be transferred from the particles to the surface, and the grain boundaries and dislocations increased by fine particle peening (FPP) are used as channels to diffuse inside the specimen. This mechanism is entirely different from the conventional carburizing methods.

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

“…The overall trend suggests that the highest and average hardness on the LSMSPed gear surfaces improve with the elevation of the three SP parameters, potentially by reason of the already high hardness of LSMed gears. However, it should be noted that factors such as the environmental temperature of SP treatment and the material of the projectile can also influence sample hardness, as demonstrated by the findings of Umeno et al [43] and Swietlicki Aleksander [44]. The perspective reinforces the idea that the elevation in LSMed gear hardness is a result of various contributing factors.…”