A thermal-metallurgical-mechanical model for laser welding Q235 steel
A thermal-metallurgical-mechanical model for laser welding Q235 steel
复制标题
激光焊接Q235钢的热冶金力学模型
DOI：
10.1016/j.jmatprotec.2016.07.002
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发表时间：
2016-12
影响因子：
6.3
通讯作者：
Yanhong Wei
中科院分区：
文献类型：
--
作者：
Gaoyang Mi;Lingda Xiong;Chunming Wang;Xiyuan Hu;Yanhong Wei
研究了激光焊接Q235钢的奥氏体、奥氏体-珠光体/铁素体相变、奥氏体-贝氏体相变和奥氏体-马氏体相变。基于各纯相的相分数和物理性质，采用线性插值法确定了热-冶金-力学（TMM）模型的物理性质。在TMM模型中考虑相变引起的体积变化和塑性应变，以表示相变对应力场的影响。利用作者开发的三维有限元程序对激光焊接过程和焊接后的温度场、相分数场和等效应力场进行了预测。为了验证模拟结果，进行了温度、相分数和应力测量实验，研究了相变对焊接温度场和应力场的影响。
Austenization, austenite-pearlite/ferrite transformation, austenite-bainite transformation, and austenite-martensite transformation for laser welding Q235 steel were modeled. The physical properties of thermal-metallurgical-mechanical (TMM) model were determined using linear interpolation based on the phase fractions and physical properties of each pure phase. The volume change and the plastic strain caused by the phase transformations were considered in the TMM model to represent the influence of phase transformations on the stress field. The temperature, phase fraction, and equivalent stress fields during and after laser welding were predicted using a three-dimensional finite element (FE) code developed by the authors to solve the TMM model. To validate the simulation results, temperature, phase fraction, and stress measurement experiments were carried out to study the influence of the phase transformations on both the temperature and stress fields during welding.
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