Numerical simulation and experimental verification of carburizing-quenching process of SCr420H steel helical gear
Numerical simulation and experimental verification of carburizing-quenching process of SCr420H steel helical gear
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DOI：
10.1016/j.jmatprotec.2008.08.017
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发表时间：
2009-04
影响因子：
6.3
通讯作者：
A. Sugianto;M. Narazaki;M. Kogawara;A. Shirayori;Soo-Young Kim;S. Kubota
中科院分区：
文献类型：
--
作者：
A. Sugianto;M. Narazaki;M. Kogawara;A. Shirayori;Soo-Young Kim;S. Kubota
使用DEFORM 2D版本。9.0 3D版本6.0建立了渗碳淬火斜齿轮有限元模型，研究了渗碳淬火斜齿轮建模的预测精度。斜齿轮模型考虑了加热、渗碳、扩散和淬火过程中的相变动力学。在计算应力-应变分布时考虑了奥氏体、马氏体和贝氏体的碳和温度相关的材料性质，包括相变引起的体积变化、潜热和相变塑性。将总应变分解为热应变、弹性应变、塑性应变、相变应变和相变塑性应变。采用了两种热边界条件，即采用集中热容法从油淬银探针估算的均匀传热系数（HTC）和采用迭代修正法从油淬SUS 304齿轮毛坯估算的基于区域的HTC。本研究的目的是评估的预测精度的模拟结果时，这两种方法的HTC。模拟和实验的结果例如，给出了冷却曲线、冷却速度曲线、径向位移、硬度、扩散碳层、残余应力和应变分布。总的来说，虽然基于区域的HTC比均匀HTC给出了更准确的热历史预测，但它在硬度、变形和残余应力的预测中没有给出显著的准确性。
Using DEFORM 2D ver. 9.0 and 3D ver. 6.0, a finite-element model was developed to study the prediction accuracy for the modeling of carburized-quenched helical gear. The helical gear model incorporates phase transformation kinetics during heating, carburizing, diffusing and quenching process. Carbon- and temperature-dependent material properties of austenite, martensite and bainite including transformation-induced volume change, latent heat and transformation plasticity are considered in calculating the stress–strain distribution. The total strain is divided into individual strain which are thermal, elastic, plastic, phase transformation and transformation plastic strain, respectively. There are 2 thermal boundary conditions employed which are uniform heat transfer coefficient (HTC) that is estimated from an oil-quenched silver probe by using the lumped-heat capacity method, and zone-based HTC that is estimated from an oil-quenched SUS304 gear blank by using the iterative modification method. The aim of this study is to evaluate the prediction accuracy of the simulated results when both methods of HTC are employed. The results of the simulation and experiment e.g., cooling curves, cooling rate curves, radial displacement, hardness, diffused carbon layer, residual stress and strain distribution are presented. The summary is that although zone-based HTC gives a more accurate prediction of thermal history than uniform HTC, it does not give significant accuracy in the prediction of hardness, distortion and residual stress.