一种新型的E-LHP软件研究了半径对瞬态换热淬火合金scm440钢棒(LHP)的影响

A. Elmaryami, W. Muhammad
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摘要

采用有限元方法对轴对称工业淬火合金钢SCM440进行了数值模拟,研究了工艺过程对材料性能和冶金性能的影响。采用一维单元轴对称模型的数学模型来确定温度历史,从而确定热处理钢筋在任何节点的硬度。最低硬度点出现在中心半长处,并计算了半径对最低硬度点的影响。在本文中,试样点的硬度(HRC)是由计算的相变特征冷却时间t1 /5(等于(t5 - t8)与硬度的转换确定的。该模型可以作为设计冷却方法的指导方针,以获得所需的机械性能,如硬度,韧性和微观结构。开发的数学模型被转换成计算机程序。计算机程序可以独立使用,也可以与温度历史软件(E-LHP-software)结合使用,连续测定和显示热处理淬火钢筋的温度历史,从而计算出最低的硬度点,并分析和研究LHP中半径的影响。根据数学模型(MM)编制的程序,通过硬度计算结果与实验工作结果的对比,对程序进行了验证和验证。比较表明了所提模型的可靠性。
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An Innovative E-LHP Software to Study the Effect of Radius on (LHP) During Transient Heat Transfer Quenched Alloy SCM440-Steel Bar
The modeling of an axisymmetric industrial quenched alloy steel SCM440 based on the finite element method (FEM) has been produced to investigate the impact of process history on material properties and metallurgical. Mathematical modeling of the 1-Dimensional element axisymmetric model has been adopted to determine the temperature history and consequently the hardness of the heat-treated steel bar at any node. The lowest hardness point (LHP) will be at the half-length at the center and the effect of radius on (LHP) is calculated. In this manuscript hardness (HRC) in specimen points was determined by the conversion of computed characteristic cooling time for phase transformation t8/5 which equal  (t5 - t8) to hardness. The model can be employed as a guideline to design a cooling approach to achieve desired mechanical properties such as hardness, toughness, and microstructure. The developed mathematical model was converted into a computer program. The computer program can be used independently or incorporated into a temperature history software named (E-LHP-software) to continuously determine and display the temperature history of the heat-treated quenched steel bar and thereby calculate the lowest hardness point and the effect of the radius in LHP can be analyzed and studied. The developed program from the mathematical model (MM) has been verified and validated by comparing its hardness results with experimental work results. The comparison indicates the reliability of the proposed model.
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