Surface pore initiated fatigue failure in laser clad components

Alam, Md. Minhaj; Powell, John; Kaplan, Alexander; Tuominen, Jari; Vuoristo, Petri; Miettinen, Juha; Poutala, J.; Näkki, Jonne; Junkala, J.; Peltola, T.

doi:10.2351/1.4793794

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…The attenuation of laser radiation by plasma or vapour has been recognized as a reason for the keyhole fluctuation. Several studies indicate a significant decrease in the fatigue life of welds containing porosity, when compared with defect-free welds [9,10,15]. The microscopic analysis was focused to the base material, heat affected zone and the weld metal.…”

Section: Resultsmentioning

confidence: 99%

Research of Laser Beam Welding of Inconel Alloy

Hodúlová

Kovaříková

Šimeková

et al. 2020

MSF

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Study of weld joints of nonferrous, Inconel 625 alloy sheets using a new generation disk laser as the green welding technology for the effective manufacturing were carried out, and the results are presented in this paper. Weld joints of the Inconel 625 alloy sheets 2,0 mm thick were welded by laser without an additional material at a flat position, using a high purity argon as the shielding gas. The influence of laser welding parameters on weld quality and mechanical properties of test joints was studied. The influence of welding speed and laser power to the joint quality was investigated. The study of quality and mechanical properties of the joints were determined by metallographic evaluation, tensile and hardness tests.

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Section: Resultsmentioning

confidence: 99%

Research of Laser Beam Welding of Inconel Alloy

Hodúlová

Kovaříková

Šimeková

et al. 2020

MSF

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“…Curve fitting was accomplished using power regression. 18. It is noteworthy that S355/Stellite 21 exhibited lower fatigue strength than S355 alone at all the applied loads.…”

Section: Fatiguementioning

confidence: 86%

Wear and corrosion resistant laser coatings for hydraulic piston rods

Tuominen¹,

Näkki²,

Pajukoski³

et al. 2015

Journal of Laser Applications

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Hydraulic piston rods on oil and gas drilling platforms, hydro-power stations, chemical plants, and underground mines are exposed to severe tribo-corrosive conditions under static and dynamic mechanical loads. Piston rods made of carbon, quenched and tempered (QT) and stainless steels are frequently surface coated with methods such as thermal spraying, hard chrome plating, and overlay welding. Unfortunately, several premature failures have been reported particularly in marine applications due to insufficient coating properties. Laser cladding has recently drawn lot of attention in this field due to high coating quality and significant improvements in productivity. In this study, several potential Fe-, Ni-, and Co-based alloys were laser clad on carbon and QT steels. Their corrosion and mechanical performances were explored in long-term salt spray, immersion, hardness, abrasive wear, and four-point bending fatigue tests. Most of the laser coatings outperformed hard chrome in corrosion properties, but hardness values were somewhat lower. In single point abrasion tests (scratch tests), the hardest laser coatings, however, outperformed hard chrome due to brittle nature of hard chrome layers. Postmachining induced significant superficial hardness increases in laser coatings, which was the main reason for good wear performance. Fatigue performance was strongly dependent on material pairs, presence of cladding defects, and applied loads. V C 2015 Laser Institute of America. [http://dx.

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“…It has been demonstrated by a previous study that surface pores filled with oxide inclusions, in laser clad components, can hardly be detected with LPI. 27…”

Section: Fracture Analysismentioning

confidence: 99%

Feasibility study on integrated structural health monitoring system produced by metal three-dimensional printing

Strantza

Baere

Rombouts

et al. 2015

Structural Health Monitoring

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Numerous structural health monitoring systems have been investigated extensively in order to enhance safety level and reduce direct operational costs. This work demonstrates the feasibility study of a new concept, the effective structural health monitoring system. The effective structural health monitoring system detects cracks using a system of capillaries incorporated into a structure. The structure with the integrated capillaries is produced by additive manufacturing, a process of adding material layer by layer. The first objective of this study is to prove that the developed system has reached technological readiness level 3. In order to prove that, four-point bending specimens with the integrated effective structural health monitoring system were tested after being produced by additive manufacturing, more specifically by laser metal deposition. The second objective of the study is to indicate that during four-point bending fatigue tests, the integrated structural health monitoring system has no influence on the crack initiation behavior. To do so, the specimens were subjected to the so-called step method. We demonstrate that the effective structural health monitoring has reached technological readiness level 3 and that the presence of effective structural health monitoring did not negatively influence the fatigue initiation process. As higher technology readiness levels are required, further investigations are still in progress.

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Surface pore initiated fatigue failure in laser clad components

Cited by 7 publications

References 14 publications

Research of Laser Beam Welding of Inconel Alloy

Research of Laser Beam Welding of Inconel Alloy

Wear and corrosion resistant laser coatings for hydraulic piston rods

Feasibility study on integrated structural health monitoring system produced by metal three-dimensional printing

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