Abstract
As a rapidly evolving advanced digital manufacturing technology, additive manufacturing (AM) has its advantages including short manufacturing cycle, material saving, and complexity for free. It has great potential for application in marine and offshore engineering. However, stress corrosion damage will be a big threat for the additively manufactured metal parts in the ocean environment due to large residual stresses generated in the building process. This paper focuses on the effect of ultrasonic peening treatment (UPT) on stress corrosion resistance of AlSi10Mg components fabricated using Selective Laser Melting (SLM). Firstly, AlSi10Mg specimens were prepared using an SLM machine, and UPT was conducted on the specimen’s top surface. Then, a series of measurements and analyses were carried out for the specimens before and after the UPT process. The residual stresses and hardness of the specimens were measured, and the surface morphology was observed using a scanning electron microscope (SEM). The resistance of stress corrosion was evaluated by the electrochemical corrosion test. The experimental results show that UPT can significantly improve stress corrosion resistance of SLM-fabricated specimens.
Highlights
The aluminum alloy AlSi10Mg has good mechanical properties, including low density, high strength, and good wear resistance [1]
Large residual stresses are generated inside the part due to the rapid melting and solidification of metal during the additively manufacturing process [6], which may lead to a decrease of stress corrosion resistance
The specimens were divided into two groups, one of which was subjected to a ultrasonic peening treatment (UPT) process under the same conditions, and the other group was kept in an as-fabricated state for a comparative experiment
Summary
The aluminum alloy AlSi10Mg has good mechanical properties, including low density, high strength, and good wear resistance [1]. It is widely used in the field of ship and ocean engineering, such as high-speed hulls, deck chambers of warships, typical components on offshore platforms and marine transportation pipelines, etc. Effective measures have to be adopted to eliminate residual stresses in aluminum alloy components fabricated using laser additive manufacturing. Some approaches including optimization of processing strategy and parameters, substrate preheating, post-heat treatment, and hybrid post process are usually used to control the distribution and magnitude of the internal stress field of the laser additive manufacturing components, thereby improving the comprehensive performance of the components [6,7,8]. All the Metals 2019, 9, 103; doi:10.3390/met9010103 www.mdpi.com/journal/metals
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