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Development of technique for identification of phase transformation model parameters on the basis of measurement of dilatometric effect-Direct problem

机译：基于测扩效应直接问题的相变模型参数识别技术的发展

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摘要

A new thermal-mechanical finite element model capable of taking into account changes in the specific volume during austenite to ferrite gamma-alpha transformation during cooling has been developed. This model, coupled with any of the existing phase transformation models, allows simulation of the sample shortening due to both thermal contraction and the dilatometric effect. The solution is considered as a direct problem model for inverse calculations. The distance between predicted and measured sample elongations is formulated as the cost function for the inverse analysis. It has been shown that the random distribution of the appearing ferritic phase within the sample cross section results in more gentle changes in the sample elongations with time during cooling than that in the case of the conventional approach. This allowed achievement of satisfactory agreement between the experimental and predicted curves in the dilatometric test reflecting both the dilatometric effect and thermal contraction of the specimen during cooling through austenite-fer-rite transformation temperatures.
机译：已开发出一种新的热机械有限元模型，该模型能够考虑到在冷却过程中奥氏体向铁素体γ-α相转变期间比容的变化。该模型与任何现有的相变模型相结合，可以模拟由于热收缩和膨胀效应引起的样品缩短。该解决方案被视为逆计算的直接问题模型。预测的和测量的样品伸长率之间的距离被公式化为逆分析的成本函数。已经表明，与常规方法相比，样品横截面内出现的铁素体相的随机分布会导致冷却过程中样品伸长率随时间的变化更为缓和。这样就可以在膨胀测试中的实验曲线和预测曲线之间达成令人满意的一致性，从而反映了在通过奥氏体-铁素体转变温度进行冷却时样品的膨胀效应和热收缩。

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