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首页> 外文会议>PVP2011;ASME Pressure Vessels and Piping conference >ACCOUNTING FOR PHASE TRANSFORMATIONS DURING WELDING OF FERRITIC STEELS
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ACCOUNTING FOR PHASE TRANSFORMATIONS DURING WELDING OF FERRITIC STEELS

机译：铁素体钢焊接过程中的相变核算

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The numerical application of solid-state phase transformation kinetics relating to conventional welding of ferritic steels is presented. The inclusion of such kinetics in weld models is shown to be necessary for capturing the post-weld residual stress field. To this end, a comparison of two approaches is outlined: a semi-empirical approach that uses thermodynamic transformation kinetics to predict phase morphology; and a fully empirical approach that directly links local material temperature to the present constituent phase(s). The semi-empirical analysis begins with prediction of TTT diagrams using thermodynamic principles for ferritic steels. The data is then converted to CCT diagrams using the Scheil-Avrami additive rule, including austenite grain growth kinetics. This information is used to predict the phases present under varying peak temperatures and cooling rates. In the fully empirical approach, dilatometric experiments of steel samples are performed during heating to simulate expected welding conditions. The constitutive response of the sample is then used as input for the subsequent numerical weld analyses. Input derived from each technique is transferred into weld models developed using the Abaqus finite element package. Model validation is carried out by direct comparison with neutron diffraction residual stress measurements on two beams of SA508 Gr.3 Cl.1 steel subjected to autogenous beam TIG welds under varying torch speeds, heat input and preheat conditions.
机译：提出了与传统铁素体钢焊接有关的固态相变动力学的数值应用。已证明在焊接模型中包含此类动力学对于捕获焊接后残余应力场是必需的。为此，概述了两种方法的比较：一种使用热力学转化动力学来预测相形态的半经验方法;另一种是使用热力学动力学来预测相态的方法。以及一种完全经验的方法，该方法将局部材料的温度直接与当前的组成相联系起来。半经验分析始于使用热力学原理预测铁素体钢的TTT图。然后使用Scheil-Avrami加法则将数据转换为CCT图，包括奥氏体晶粒生长动力学。该信息用于预测在变化的峰值温度和冷却速率下存在的相。在完全经验方法中，在加热过程中对钢样品进行了扩径实验，以模拟预期的焊接条件。然后将样品的本构响应用作后续数值焊接分析的输入。从每种技术获得的输入都将转换为使用Abaqus有限元软件包开发的焊接模型。通过与中子衍射残余应力测量值直接比较，对SA508 Gr.3 Cl.1钢的两根在不同的焊炬速度，热量输入和预热条件下进行自发束TIG焊的梁进行模型验证。

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