Abstract
This paper is devoted to the study of frequency effects on hardness profile of AISI 4340 spline shaft heat-treated by induction through an extensive 3D finite element method simulation and structured experimental investigation. Based on coupled electromagnetic and thermal fields analysis, the 3D model is used to estimate the temperature distribution and the hardness profile. The proposed study examines the hardening process parameters, such as frequency, induced current density and heating time, known to have an influence on hardened surface and builds the simulation model step by step. The established model can provide not only an accurate prediction of temperature distribution and hardness profile but also a comprehensive analysis of machine parameters effects, especially the frequency. The numerical results achieved by this model are good and present a great agreement to the experimental data.
Highlights
Surface transformation hardening processes are designed to improve wear and fatigue resistance by hardening the superficial critical areas using brief and localized heat gains
To be able to appropriately use the resources offered by an induction heating system, it is necessary to develop a comprehensive strategies to control the heating process parameters in order to produce desired hardened surface characteristics for a specific application
The efficiency of an induction heating system for typical application depends on several factors such as characteristics of the mechanical part itself, inductor design and heating system parameters [2]-[6]
Summary
Surface transformation hardening processes are designed to improve wear and fatigue resistance by hardening the superficial critical areas using brief and localized heat gains Among these processes, induction heating process is well-known by its capacity in terms of high power density which allows short interaction times to reach the required temperature, while limiting the risks of undesirable distortion and deformation effects [1] [2]. The efficiency of an induction heating system for typical application depends on several factors such as characteristics of the mechanical part itself (material and geometry), inductor design and heating system parameters (power supply capacity, frequency, induced current density, heating time, etc.) [2]-[6]. Various induction heating parameters such as frequency, induced current density and heating time are tested and their effects on temperature distribution and hardness profile are evaluated. The numerical results achieved by the 3D model are validated using relevant experimental data
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