Laser surface remelting and hardening of an automotive shaft sing a high-power fiber laser

Lima, Milton Sérgio Fernandes de; Goia, Flavia Aline; Riva, Rudimar; Santo, Ana Maria do Espírito

doi:10.1590/s1516-14392007000400022

Cited by 19 publications

(2 citation statements)

References 7 publications

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“…Orbital LBW was accomplished by coupling a CNC lathe to the laser welding head so the focal position was fixed on the tube surface. The experimental procedure was explained in more detail elsewhere 20 . The tube spanat 42RPM and total welding time for one turn was 1.6 seconds; consequently, the surface speed was 33.3mm/s.…”

Section: Methodsmentioning

confidence: 99%

Mechanical and Corrosion Properties of a Duplex Steel Welded using Micro-Arc or Laser

Lima¹,

Carvalho

Teleginski

et al. 2015

Mat. Res.

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Duplex stainless steels have been extensively used in parts that are subject to corrosive environments and that have high mechanical strength requirements. Welding usually distorts the well-balanced austenite-ferrite ratio, and can produce brittle intermetallic phases; therefore, post-welding heat treatments are usually required. For applications where post-welding treatments are not possible, low heat input methods, such as micro-tungsten inert gas welding (TIG) and laser beam welding (LBW), can be used. The present investigation analyzed the microstructure, mechanical, and corrosion properties of 2507-classduplex steel tubes after welding. The microstructures of the heat-affected zones and the fusion zones contained variable amounts of ferrite and austenite. In the heat-affected and fusion zones in the TIG samples, the microstructures were primarily composed of ferrite grains with allotriomorphic austenite at the grain boundaries, intragranular Widmanstätten needles and plate-like precipitates. The LBW samples showed much finer microstructures, which contained austenite in the grain boundaries and fine austenite precipitates in the ferrite grains. Deleterious intermetallic phases, such as σ-phases, were not observed using X-ray diffraction. The tensile strength properties were very similar for the TIG and LBWsamples, reaching tensile strengths of approximately 840 MPa and total elongations between 61 and 87%. The heat-affected zone of the TIG welds were particularly susceptible to corrosion (0.05 mm/year) compared to the base metal (0.007 mm/year) and the laser welds (0.01 mm/year). Therefore, laser welding is a promising technique for the welding of 2507-class duplex tubes.

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Section: Methodsmentioning

confidence: 99%

Mechanical and Corrosion Properties of a Duplex Steel Welded using Micro-Arc or Laser

Lima¹,

Carvalho

Teleginski

et al. 2015

Mat. Res.

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“…Laser repair welding of nitrided tool steel was investigated by Vedoni et al 19 The findings from the microstructural analysis revealed that a significant reduction in defects in the nitrided steel samples could be achieved by the method developed using the laser heating process. Laser surface remelting of steel shafts using a high power laser was carried out by de Lima et al 20 They demonstrated that a martensite region was formed after the rapid solidification. In addition, the microhardness inside the martensite region was double that of the base material.…”

Section: Introductionmentioning

confidence: 99%

Laser treatment of carbon film coated steel surface

Yilbaş

Akhtar

Matthews

et al. 2012

Surface Engineering

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Laser controlled melting in nitrogen of a preprepared steel surface has been carried out. A carbon film formed from a phenolic resin precursor containing 5 vol.-% of TiC particles was first formed at the surface of the steel before the laser treatment. The morphological and metallurgical changes in the laser treated region were examined using scanning electron microscopy and X-ray diffraction (XRD). Temperature and stress fields were predicted in the workpiece using a finite element code. The residual stress at the surface was measured using XRD. The hardness of the workpiece was measured using microindention testing. It was found that the laser treatment results in a dense layer composed of fine grains and TiC particles at the surface, which enhances surface microhardness. The presence of the carbon film at the surface and high pressure nitrogen gas enable the formation of FeN 3 and Fe(N,C) phases at the surface and nitrogen diffusion into the substrate material causes nitride precipitation below the surface. The residual stress measured using the XRD technique at the surface region is 2420 MPa, which is in agreement with the numerical predictions.

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Microstructural, hardening, and wear characteristics of surface re-melted AISI 410S stainless steel via fiber laser process

Nayebi¹,

Najafi²,

Farnia³

2021

J Mech Sci Technol

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Laser surface remelting and hardening of an automotive shaft sing a high-power fiber laser

Cited by 19 publications

References 7 publications

Mechanical and Corrosion Properties of a Duplex Steel Welded using Micro-Arc or Laser

Mechanical and Corrosion Properties of a Duplex Steel Welded using Micro-Arc or Laser

Laser treatment of carbon film coated steel surface

Microstructural, hardening, and wear characteristics of surface re-melted AISI 410S stainless steel via fiber laser process

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