Numerical modeling and synchrotron diffraction measurements of residual stresses in laser powder bed fusion manufactured alloy 625

Materials & Design

Carl-Johan Hassila¹  Andreas Lundbäck²  Martin Fisk³  Urban Wiklund⁴  Andreas Malmelöv⁵ 

[1] Corresponding author.;Division of Solid Mechanics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;Applied Materials Science, Uppsala University, SE-751 03 Uppsala, Sweden;Materials Science and Applied Mathematics, Malmö University, SE-205 06 Malmö, Sweden;Mechanics of Solid Materials, Luleå University of Technology, SE-971 87 Luleå, Sweden;

关键词: Residual stress;    Material model;    Alloy 625;    Deformations;    Finite Element Method;    Synchrotron X-ray diffraction;   

DOI  :  

来源: DOAJ

【 摘 要 】

Residual stresses in metal additive manufactured components are a well-known problem. It causes distortion of the samples when removing them from the build plate, as well as acting detrimental with regard to fatigue. The understanding of how residual stresses in a printed sample are affected by process parameters is crucial to allow manufacturers to tune their process parameters, or the design of their component, to limit the negative influence of residual stresses. In this paper, residual stresses in additive manufactured samples are simulated using a thermo-mechanical finite element model. The elasto-plastic behavior of the material is described by a mechanism-based material model that accounts for microstructural and relaxation effects. The heat source in the finite element model is calibrated by fitting the model to experimental data. The residual stress field from the finite element model is compared with experimental results attained from synchrotron X-ray diffraction measurements. The results from the model and measurement give the same trend in the residual stress field. In addition, it is shown that there is no significant difference in trend and magnitude of the resulting residual stresses for an alternation in laser power and scanning speed.

【 授权许可】

Unknown