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首页> 外文会议>World Congress on Integrated Computational Materials Engineering >ICME-Based Process and Alloy Design for Vacuum Carburized Steel Components with High Potential of Reduced Distortion
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ICME-Based Process and Alloy Design for Vacuum Carburized Steel Components with High Potential of Reduced Distortion

机译：基于ICME的真空渗碳钢组件的工艺和合金设计，具有降低变形的高潜力

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Carburized steel components are usually quenched from a hardening temperature, which lies in a complete austenitic phase, to room temperature. This leads to a microstructure comprised of mostly martensite plus bainite giving rise to unwanted heat-treatment-induced distortion. However, having a soft phase of ferrite dispersed throughout the microstructure can be quite effective in this regard. This is attributed to the capability of ferrite in accommodating the plasticity resulted from austenite-to-martensite transformation expansion. In the context of this work, it is demonstrated that how a proper selection of chemical compositions and a hardening temperature can greatly suppress the associated distortion. Hence, in order to systematically design a new steel alloy which fits to the above mentioned conditions, an ICME-based methodology has been employed. Thus, a series of calculations have been carried out by means of the well-known thermodynamic-based software Thermo-Calc and the scripting language of Python. The austenite to ferrite phase transformation kinetics is also captured by the software DICTRA generating a virtual TTT (Time-Temperature-Transformation) diagram which is subsequently utilized for further finite element simulations in the software Simufact.forming. The carburizing process, the following phase transformations and the effect of the developed microstructure on the final distortion are simulated in macro-scale through Simufact. forming. The finite-element-based results of the Simufact.forming have in turn been enhanced by the results of the above-mentioned thermodynamic-based computational tools. At a later stage the simulation outcomes are experimentally validated by employing Navy C-Ring specimens.
机译：渗碳钢组分通常从硬化温度淬灭，其位于完整的奥氏体相中，达到室温。这导致由Martensite Plus Bainite组成的微观结构，从而产生不需要的热处理诱导的变形。然而，在整个微观结构中具有分散的铁素体的软相可以在这方面非常有效。这归因于铁素体在奥氏体 - 马氏体转化膨胀引起的可塑性方面的能力。在这项工作的上下文中，证明了如何正确选择化学组成和硬化温度可以大大抑制相关的变形。因此，为了系统地设计一种适合上述条件的新型钢合金，已经采用了基于ICME的方法。因此，通过众所周知的基于热力学的软件热量计算和Python的脚本语言，已经进行了一系列计算。对铁氧体相变动力学的奥氏体也被软件DiCtra捕获了虚拟TTT（时间温度变换）图，该图随后用于软件SIMUFAFT.Forming中的进一步有限元模拟。通过SIMFFFFFFAFF模拟渗碳过程，以下相变和显影微观结构对最终变形的效果。成型。通过上述基于热力学的计算工具的结果，依次的基于有限元的结果依次提高。在稍后的阶段，通过采用海军C环样品进行实验验证的模拟结果。

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