2A12厚板铝合金淬火过程有限元建模研究

Finite Element Modeling of Quenching Process of 2A12 Aluminum Block

淬火残余应力可能造成工件淬后裂纹、削弱其疲劳强度以及造成其体积和形状的变化。在需要进行淬火处理的厚板结构铝合金零件中,这一情况尤为显著。因此,对厚板铝合金淬火过程进行有限元模拟,预测其淬后残余应力大小及分布,具有十分重要的意义。本文运用ABAQUS/Standard软件建立了2A12厚板铝合金的淬火过程有限元模型,并用反传热算法确定了以聚乙撑二醇(PAG)溶液作为淬火介质时的换热边界条件。为了验证模拟结果的可靠性,应用X射线法对厚板淬火残余应力进行了测量。模拟结果与实测数据具有较好的一致性,表明本文建立的有限元模型具有较高的精度。

Quenching residual stresses may induce quench crack and fatigue strength reducing, and cause distortion and dimensional variation. This phenomenon is particularly obvious in aluminum parts with block structure. Thus, it＇s important to conduct quenching simulation of aluminum blocks in order to predict the magnitude and distribution of quenching residual stress. In this study, finite element model of aluminum alloy 2A12 blocks were developed by using commercial finite element code ABAQUS/Standard software. Heat transfer boundary condition had also been investigated through inverse heat transfer method while PAG solution was used as quenching medium. The agreement between simulation results and experimental data proves the reliability of the finite element model developed in this study.