Factors Affecting the Hardness Characteristics of Microstructures in Gas Carburized Chromium Alloy Steels

We analyzed the factors affecting gas carburizing microstructure of parts for constant velocity joints. Gas 0.15-0.20C1.13-1.14Cr chromium alloy steel used in automobile drive units is characterized by changing properties layer depth direction.
 The experimental conditions were set to enable field application. components specimen be carburization X-ray fluorescence. Changes mechanical carburized micro-hardness, microstructure, and content. cycle was selected based on simulation results. characteristics change before after two samples with different carbon content analyzed.
 temperature that can manufacturing 930°C, potential required 0.90wt%, diffusion 0.75wt%. inner outer hardness values satisfying effective hardening 550Hv 400Hv-740Hv. In case 0.20C steel, a amount 0.36wt% 1.467 mm. also 0.15C its 0.746 results selecting heat treatment showed similar trend. structure related martensite. As result EPMA, SEM, XRD analysis, martensite correlated, increased as increasing. EPMA smaller greater carburization.
 intend proceed optimization mass production connection wear resistance fatigue. It expected these will contribute improvement durability driving parts.