A master thesis from Aalborg University
Effect of Laser Forming on Material Properties of AISI 304 steel: Varying Laser Power
Author(s)
Term
4. semester
Education
Publication year
2024
Submitted on
2024-05-31
Pages
68 pages
Abstract
Laser forming is a non-contact deformation method, utilizing thermal expansion and contraction to cause plastic deformation. Knowledge on the effect of laser forming on material properties is required if laser forming is to be used in industry. This study seeks to develop a method of producing laser formed samples, suitable for various property testing experiments, including mechanical testing. Furthermore, the method seeks to isolate the effect of laser forming. The proposed method consists of three step: (1)mechanically bending dog-bone samples, (2)annealing to annul the effect of bending, (3)straightening the sample using laser forming. Due to equipment difficulties the annealing step was not possible. Three different sample groups were produced varying the maximum laser power between 350[W], 400[W] and 450[W]. The material property tests of laser formed samples includes microstructural examination, testing of Vickers hardness, tensile and fatigue properties, and were compared to a reference sample group. Grain sizes increased near the irradiated surface compared to reference material. Hardness through the thickness of laser formed samples increased and adapted a sine-wave shaped distribution. Tensile strength and strain increased slightly as a result of laser forming. Fatigue data showed a large spread in results for the laser formed samples, and no conclusive trends were made from this.
Keywords
Documents
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