Papers by Author: Fa Yu Wu

Abstract: At present work, the microstructure and corresponding hardness of 17-4PH stainless steel were investigated by the process of CO₂ laser surface quenching and aging treatment. The hardness of the phase transformation zone in the hardened layer was 433.2HV, higher than 378.1HV of the matrix, which was attributed to the fine-grain and solution strengthening after laser quenching. The hardness of the phase transformation zone increased further to 464.5HV after an aging treatment at 520°C due to the precipitation strengthening of fine secondary phase particles.

Abstract: The thermal and electrical transport properties of carbon micro-coils under the condition of common use were measured and discussed. The temperature-dependence, the load-bearing stability, the explicit and implicit values of those properties were brought forward to provide the references for their reliable industrial design and high efficient service.