Analysis of residual stress and corrosion resistance of laser shock-processed 6012 and 6082 aluminium alloys

Trdan, Uroš; Grum, Janez; Porro, J.A.; Ocaña, J.L.

doi:10.1117/12.816643

Cited by 6 publications

(8 citation statements)

References 5 publications

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“…RS in the material present one of the main influences on fatigue properties of the material; therefore, knowledge of the RS gives an insight into material condition, and the prediction under dynamic loads is possible (Trdan et al, 2009). Figure 4 shows a comparison of the minimal principal RS profiles for the specimen in the initial state, after SP and after LP.…”

Section: Analysis Of Rsmentioning

confidence: 99%

“…Sano et al (2006) also confirmed the applicability of LP to improve stress‐corrosion cracking. Trdan et al (2009) concluded lower pit density on laser shock‐peened 6xxx aluminium alloys at the anodic polarisation corrosion tests. García‐Alonso et al (2000) in their study confirmed that lower roughness of alumina film Al 2 O 3 enables higher corrosion resistance with higher pitting/breakdown potential.…”

Section: Introductionmentioning

confidence: 97%

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Surface modification of laser‐ and shot‐peened 6082 aluminium alloy

Trdan

Žagar

Grum

et al. 2011

International Journal of Structural Integrity

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Purpose -The purpose of this paper is to investigate the effect of shock waves and strain hardening effect of laser and shot peening on precipitation-hardened aluminium alloy AA 6082-T651. Design/methodology/approach -The hardened layer was evaluated by means of surface integrity with optical microscopy, scanning electron microscope (SEM), energy dispersive spectroscopy, analysis of microhardness and residual stress profiles. Corrosion anodic polarization tests in a 3.5 per cent NaCl water solution were carried out to express a pitting potential and the degree of pitting attack, which was verified on SEM and with 3D metrology. Findings -Research results indicated significant differences between two treatment techniques which had an important influence on the final condition of the surface layer. Potentiodynamic polarization tests inferred that laser peening enabled shift of the pitting potential to more positive values, which ensures higher corrosion resistance. Originality/value -Results confirmed that the higher corrosion resistance of the laser-peened specimens against pitting corrosion depends on the modification of the surface, due to ablation during plasma generation. Despite increased surface roughness, laser-peened specimen exhibits beneficial increase of the pitting/breakdown potential and in reduction of pitting attack degree at the specimen surface.

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Section: Analysis Of Rsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Surface modification of laser‐ and shot‐peened 6082 aluminium alloy

Trdan

Žagar

Grum

et al. 2011

International Journal of Structural Integrity

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“…Sano et al [20] also confirmed the applicability of LSP to improve stress corrosion cracking. Trdan et al [2,21] concluded that there was a lower pit density on LSP-ed 6xxx aluminium alloys after anodic polarisation corrosion tests. García-Alonso et al [22] confirmed that the lower roughness of alumina film Al 2 O 3 enables enhanced corrosion resistance with higher pitting/breakdown potential.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Corrosion Behaviour of Aluminium Alloy Subjected to Laser Shock Peening without a Protective Coating

Trdan

Grum

2015

Advances in Materials Science and Engineering

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The effect of shock waves and strain hardening of laser shock peening without protective coating (LSPwC) on alloy AA 6082-T651 was investigated. Analysis of residual stresses confirmed high compression in the near surface layer due to the ultrahigh plastic strains and strain rates induced by multiple laser shock waves. Corrosion tests in a chloride environment were carried out to determine resistance to localised attack, which was also verified on SEM/EDS. OCP transients confirmed an improved condition, that is, a more positive and stable potential after LSPwC treatment. Moreover, polarisation resistance of the LSPwC treated specimen was by a factor of 25 higher compared to the untreated specimen. Analysis of voltammograms confirmed an improved enhanced region of passivity and significantly smaller anodic current density of the LSPwC specimen compared to the untreated one. Through SEM, reduction of pitting attack at the LSPwC specimen surface was confirmed, despite its increased roughness.

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“…The state of residual stress is important in the resulting corrosion behaviour of the embossed surfaces due to the modification of the surface as well as the subsequent passivation capability of the surface. [ 49,50 ] Due to the anisotropic nature of the embossing process, it is expected that there is a difference in the residual stress state on either side of the fins on the surface of the Al−1.1 wt% Mn strip material. However, the analysis of this is currently out of the scope of this paper.…”

Section: Discussionmentioning

confidence: 99%

Microstructure‐dependent corrosion of herringbone‐grooved embossed Al–1.1 wt% Mn strips for heat exchanger tubes

Zaffaroni

Gudla

Laganá

et al. 2021

Materials & Corrosion

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This paper studied the effect of embossing on the microstructure and corrosion behaviour of an Al−1.1 wt% Mn sheet. The microstructure of the embossed Al−1.1 wt% Mn sheets was studied by differential interference contrast microscopy, scanning electron microscopy, transmission electron microscopy, energy‐dispersive X‐ray spectroscopy, focused ion beam microscopy and X‐ray computational tomography. Finite element modelling was used to assess the stress and strain distribution developed during embossing, and to support the experimental analyses. The corrosion behaviour of the embossed sheets was assessed using potentiodynamic anodic polarisation tests, followed by corrosion surface morphology analysis. Results showed a microstructural evolution of the alloy during embossing, which is dependent on both the embossed pattern geometry and the roll forming direction. Nonsymmetrical displacement of material, in respect to the pattern geometry, was caused by the anisotropic forming pressure applied on the strip during roll forming, which yielded the formation of more susceptible sites for pitting and intergranular corrosion on the embossed aluminium surfaces.

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Analysis of residual stress and corrosion resistance of laser shock-processed 6012 and 6082 aluminium alloys

Cited by 6 publications

References 5 publications

Surface modification of laser‐ and shot‐peened 6082 aluminium alloy

Surface modification of laser‐ and shot‐peened 6082 aluminium alloy

Investigation of Corrosion Behaviour of Aluminium Alloy Subjected to Laser Shock Peening without a Protective Coating

Microstructure‐dependent corrosion of herringbone‐grooved embossed Al–1.1 wt% Mn strips for heat exchanger tubes

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