Publication

Laser shock peening: A promising tool for tailoring metallic microstructures in selective laser melting

Roland Logé, Ke Huang, Nikola Kalentics, Valerio Romano, Andreas Burn, Manuel Ortega Varela De Seijas
2019
Journal paper

Abstract

Metallic parts made by Selective Laser Melting (SLM) are known for their heterogeneous microstructures in the as-built (AB) state. In this paper, Laser Shock Peening (ISP) was performed on a 316 L stainless steel part fabricated by SLM. The LSP treatment increases the stored energy in the material but does not lead to measurable grain refinement. When subsequently annealed, the LSP treated sample undergoes recrystallization and transforms into a refined equiaxed structure, while this transformation is not activated yet for the AB sample. The ISP strategy therefore offers new routes for the selective 3D control of microstructures and mechanical properties of SLM parts.

Official source

https://infoscience.epfl.ch/record/266795?ln=en

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Related concepts (17)

In metallurgy, peening is the process of working a metal's surface to improve its material properties, usually by mechanical means, such as hammer blows, by blasting with shot (shot peening), focusing light (laser peening), or in recent years, with water column impacts (water jet peening) and cavitation jets (cavitation peening). With the notable exception of laser peening, peening is normally a cold work process tending to expand the surface of the cold metal, thus inducing compressive stresses or relieving tensile stresses already present.

Heat treating (or heat treatment) is a group of industrial, thermal and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve the desired result such as hardening or softening of a material.

In physics, energy () is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light. Energy is a conserved quantity—the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The unit of measurement for energy in the International System of Units (SI) is the joule (J).

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Laser shock peening: A promising tool for tailoring metallic microstructures in selective laser melting

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Multi-Scale Study of High-Temperature Latent Heat Storage With Metallic Phase Change Materials

Multi-Scale Study of High-Temperature Latent Heat Storage With Metallic Phase Change Materials