Residual stresses induced by laser welding process in the case of a dual-phase steel DP600: Simulation and experimental approaches
Residual stresses induced by laser welding process in the case of a dual-phase steel DP600: Simulation and experimental approaches
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DOI：
10.1016/j.matdes.2017.03.022
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发表时间：
2017-06
影响因子：
8.4
通讯作者：
A. Kouadri-Henni;C. Seang;B. Malard;V. Klosek
中科院分区：
文献类型：
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作者：
A. Kouadri-Henni;C. Seang;B. Malard;V. Klosek
本研究的目的是表征的残余应力分布的DP600进行激光束焊接。用中子衍射技术测定了铁素体相的残余应力。结果证实了残余应力的梯度在不同的区域之间的顶部和下面的表面上，但也通过厚度的融合区。在接近HAZ区（热影响区）的BM（基底金属）中观察到低压缩应力，而在FZ（熔合区）中观察到高拉伸应力。进行了两个数值模拟策略：首先与弹塑性模型（EP），然后与粘弹性塑性模型（VEP），考虑到相变引起的体积应变的影响。这两种模型都允许突出不同区域的残余应力演变。数值结果表明，不同的模型，残余应力分布的差异。最后，看来，高温，具体到激光束，是主要因素控制的残余应力。当将模拟结果与实验数据进行比较时，数值在某些区域收敛得很好，特别是FZ，而其他区域收敛得较少。
This study aimed at characterizing the residual stresses distribution of a DP600 undergoing a laser beam welding. The residual stresses in the ferritic phase have been experimentally determined by the use of the neutron diffraction technique. The results confirmed a gradient of residual stresses among different zones both on the top and below surfaces but also through the thickness of the fusion zone. Low compressive stresses were observed in the BM (Base metal) close to the HAZ zone (heat affected zone) whereas high tensile stresses were observed in the FZ (fusion zone). Two numerical modelling strategies were conducted: first with elastic plastic model (EP) and then with a visco-elastic plastic model (VEP) which takes into account the effect of phase transformation-induced volumetric strain. Both models allowed highlighting the residual stresses evolution through the different zones. Numerical results showed a difference in the residual stresses distribution depending on the model used. In the end, it appears that the high temperature, specific to the laser beam, is the main factor governing the residual stresses. When comparing simulation results with experimental data, the values converge well in some zones, in particular the FZ and the others less.