Effects of phase transition temperature and preheating on residual stress in multi-pass & multi-layer laser metal deposition
| Autor: | Wang Yiwen, S.Y. Dong, H.S. Huang, Y.L. Jiang, B. Liu, S.B. Li, J.X. Fang |
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| Rok vydání: | 2019 |
| Předmět: |
Hole drilling method
Phase transition Materials science Mechanical Engineering Alloy Metals and Alloys 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Physical property Stress field Compressive strength Mechanics of Materials Residual stress Materials Chemistry engineering Laser metal deposition Composite material 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 792:928-937 |
| ISSN: | 0925-8388 |
| Popis: | To investigate the influences of phase transition temperature and preheating on the residual stress of multi-layer and multi-pass laser metal deposition (LMD), the multi-layer and multi-pass LMD, with and without preheating, were performed using five kinds of alloy with different phase transition features, and their residual stresses were measured using the hole drilling method. A finite-element (FE) model incorporating the phase transition was developed based on experimentally obtained physical property data. The results demonstrated that the low-temperature solid phase transition has a tensile stress relaxation effect, which leads to the formation of a compressive stress area. This relaxation effect was observed to decrease with the increase of the phase transition temperature. The high-temperature solid phase transition has no significant tensile stress relaxation effect during the multi-layer and multi-pass LMD process, which is different from the single track LMD. when the solid phase transition temperature is low, the preheating can improve the uniformity of the stress field only to a certain extent. However, when the preheating increases the lowest temperature of the thermal cycle and makes it higher than the starting point temperature of the solid phase transition, the tensile stress relaxation effect of the solid phase transition can be brought into full play. |
| Databáze: | OpenAIRE |
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