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Heat treatment for metal additive manufacturing Vrije Universiteit Brussel

Majid Laleh, Esmaeil Sadeghi, Reynier I. Revilla, Qi Chao, Nima Haghdadi, Anthony Hughes, Wei Xu, Iris De Graeve, Ma Qian, Ian Gibson, et al.
Metal additive manufacturing (AM) refers to any process of making 3D metal parts layer-upon layer via the interaction between a heating source and feeding material from a digital design model. The rapid heating and cooling attributes inherent to such an AM process result in het erogeneous microstructures and the accumulation of internal stresses. Post-processing heat treatment is often needed to modify the microstructure and/or alleviate ...

Methods—On the Application of Ambient Scanning Kelvin Probe Force Microscopy to Understand Micro-Galvanic Corrosion Phenomena: Interpretation and Challenges Vrije Universiteit Brussel

Reynier I. Revilla
The capabilities of scanning Kelvin probe force microscopy (SKPFM) to directly measure local Volta potential differences with relatively high spatial resolution has made it a very popular technique to assess the relative nobility of intermetallic phases and therefore to understand corrosion susceptibility and microgalvanic corrosion activity in several alloys. However, the direct correlation between galvanic corrosion activity and Volta ...

Impact of surface oxides on steel on hydrogen absorption and desorption Vrije Universiteit Brussel

Tim Rubben
The problem of hydrogen assisted cracking (HAC) of steel has been known for over 140 years. However, it is still not solved nor fully understood. The presence of
atomic hydrogen in a metal can cause important ductility loss, known as “hydrogen embrittlement (HE)”, and can be introduced during the production and processing
of steel or during its use, referred to as internal hydrogen embrittlement (IHE) and hydrogen environment ...

Revealing the stress corrosion cracking initiation mechanism of alloy 718 prepared by laser powder bed fusion assessed by microcapillary method Vrije Universiteit Brussel

Arshad Yazdanpanah, Mattia Franceschi, Reynier I. Revilla, Saeed Khademzadeh, Iris De Graeve, Manuele Dabala
Stress corrosion cracking (SCC) behaviour of L-PBF processed alloy 718 in chloride-containing solution was revealed, utilizing the microcapillary method under constant tensile loading. Results were compared with conventionally produced counterparts. Passive layer resistance was compared quantitatively by implementing electrochemical polarization experiments, in as-received and under tensile loading states. Superior corrosion and SCC resistance ...

Microstructural Features, Defects, and Corrosion Behaviour of 316L Stainless Steel Clads Deposited on Wrought Material by Powder- and Laser-Based Direct Energy Deposition with Relevance to Repair Applications Vrije Universiteit Brussel

Reynier I. Revilla, Iris De Graeve
This work analyses the microstructural defects and the corrosion behaviour of 316L stainless steel clads deposited by laser metal deposition on wrought conventional material, which is a highly relevant system for repair applications. The different defects and microstructural features found in these systems were identified and analysed from a perspective relevant to the corrosion performance of these materials. The role of these features and ...

New insights into the mechanism of localised corrosion induced by TiN-containing inclusions in high strength low alloy steel Vrije Universiteit Brussel

Chao Liu, Reynier I. Revilla, Xuan Li, Shufeng Yang, Dawei Zhang, Herman Terryn, Xiaogang Li

This work investigated the chemical and electrochemical mechanisms of localised corrosion triggered by CaS·xMgO·yAl2O3·TiN complex inclusions in high strength low alloy steel (HSLAS) under a simulated marine environment. Special focus was given to the role of the TiN portion of the inclusion on the initiation and growth of the corrosion pits. The thermodynamic process of pitting initiation was investigated by Gibbs free energy, Pourbaix ...

Effect of Thermal Treatment on Corrosion Behavior of AISI 316L Stainless Steel Manufactured by Laser Powder Bed Fusion Vrije Universiteit Brussel

Francesco Andreatta, Alex Lanzutti, Reynier I. Revilla, Emanuele Vaglio, Giovanni Totis, Marco Sortino, Iris De Graeve, Lorenzo Fedrizzi
The effect of post-processing heat treatment on the corrosion behavior of AISI 316L stainless steel manufactured by laser powder bed fusion (L-PBF) is investigated in this work. Produced stainless steel was heat treated in a broad temperature range (from 200 °C to 1100 °C) in order to evaluate the electrochemical behavior and morphology of corrosion. The electrochemical behavior was investigated by potentiodynamic and galvanostatic polarization ...

Growth kinetics and passive behavior of the native oxide film on additively manufactured AlSi10Mg versus the conventional cast alloy Vrije Universiteit Brussel

Reynier I. Revilla, Herman Terryn, Iris De Graeve
This work studies the passive behavior and growth kinetics of the native oxide on additively manufactured AlSi10Mg and compares it with that of the conventional cast alloy, which presents a markedly different microstructure. With the use of a scanning Kelvin probe force microscopy (SKPFM)-based methodology, the growth kinetics of native oxide films on these alloys was examined. The microstructure of these materials had a great impact on the ...

Growth kinetics and passive behavior of the native oxide film on additively manufactured AlSi10Mg versus the conventional cast alloy Vrije Universiteit Brussel

Reynier I. Revilla, Herman Terryn, Iris De Graeve

This work studies the passive behavior and growth kinetics of the native oxide on additively manufactured AlSi10Mg and compares it with that of the conventional cast alloy, which presents a markedly different microstructure. With the use of a scanning Kelvin probe force microscopy (SKPFM)-based methodology, the growth kinetics of native oxide films on these alloys was examined. The microstructure of these materials had a great impact on the ...

Corrosion challenges towards a sustainable society Vrije Universiteit Brussel

Roman Bender, Reynier I. Revilla, Iris De Graeve, Herman Terryn
A global transition towards more sustainable, affordable and reliable energy systems is being stimulated by the Paris Agreement and the United Nation's 2030 Agenda for Sustainable Development. This poses a challenge for the corrosion industry, as building climate-resilient energy systems and infrastructures brings with it a long-term direction, so as a result the long-term behaviour of structural materials (mainly metals and alloys) becomes a ...