Abstract
The modelling of an axisymmetric industrial quenched chromium steel bar AISI-SAE 8650H based on finite element method has been produced to investigate the impact of process history on metallurgical and material properties. Mathematical modelling of 1-dimensional line (radius) element axisymmetric model has been adopted to predict temperature history and consequently the hardness of the quenched steel bar at any point (node). The lowest hardness point (LHP) is determined. In this paper hardness in specimen points was calculated by the conversion of calculated characteristic cooling time for phase transformation t8/5 to hardness. The model can be employed as a guideline to design cooling approach to achieve desired microstructure and mechanical properties such as hardness. The developed mathematical model is converted to a computer program. This program can be used independently or incorporated into a temperature history calculator to continuously calculate and display temperature history of the industrial quenched steel bar and thereby calculate LHP. The developed program from the mathematical model has been verified and validated by comparing its hardness results with commercial finite element software results.
Highlights
Quenching is a heat treatment usually employed in industrial processes in order to control mechanical properties of steels such as hardness [1]
Quenching of steels is a multiphysics process involving a complicated pattern of couplings among heat transfer, because of the complexity, coupled theory, and nonlinear nature of the problem, no analytical solution exists; numerical solution is possible by finite difference method, finite volume method, and the most popular one-finite element method (FEM) [4]
During the quenching process of the steel bar, the heat transfer is in an unsteady state as there is a variation of temperature with time [5]
Summary
Quenching is a heat treatment usually employed in industrial processes in order to control mechanical properties of steels such as hardness [1]. During the quenching process of the steel bar, the heat transfer is in an unsteady state as there is a variation of temperature with time [5]. The three dimensional analysis will be reduced into a 1-dimensional axisymmetric analysis to save cost and computer time [4, 6, 16]. This is achievable because in axisymmetric conditions, there is no temperature variation in the theta (θ) direction and in (z) direction, the temperature deviations are only in (r). 1-dimensional line (radius) element will be developed
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