Control of defects during laser surface alloying

Goswami, G.; Kumar, Dharmesh; Grover, A. K.; Pappachan, A. L.; Totlani, M.K.

doi:10.1179/026708499322911674

Cited by 14 publications

(8 citation statements)

References 16 publications

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“…High depth of alloying with low distortion can also be achieved [8]. The more importance and silent features of laser surface alloying was outlined by Vilar [9].…”

Section: Introductionmentioning

confidence: 98%

Influence of microstructure on slurry erosive wear characteristics of laser surface alloyed 13Cr–4Ni steel

Shivamurthy

Kamaraj

Nagarajan

et al. 2009

Wear

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“…High depth of alloying with low distortion can also be achieved [8]. The more importance and silent features of laser surface alloying was outlined by Vilar [9].…”

Section: Introductionmentioning

confidence: 98%

Influence of microstructure on slurry erosive wear characteristics of laser surface alloyed 13Cr–4Ni steel

Shivamurthy

Kamaraj

Nagarajan

et al. 2009

Wear

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“…A high depth of alloying with low distortion can also be achieved. [9] Among hardfacing alloys, nickel-based Colmonoy 88 powder is a unique alloy that contains chromiumtungsten borides and carbides for maximum abrasion and corrosion resistance and is a relatively low-cost alloy. [10] The excellent properties of these powders are yet to be explored in the turbine industry.…”

Section: Introductionmentioning

confidence: 99%

Slurry Erosion Characteristics and Erosive Wear Mechanisms of Co-Based and Ni-Based Coatings Formed by Laser Surface Alloying

Shivamurthy

Kamaraj

Nagarajan³

et al. 2009

Metall Mater Trans A

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In the present work, an attempt has been made to study the slurry erosion properties and operating erosive wear mechanisms of Co-based Stellite 6 and Ni-based Colmonoy 88 coatings, and also to list the conditions at which maximum and minimum erosion rates occur. Laser surface alloying (LSA) has been done on 13Cr-4Ni steels with commercial Co-based Stellite 6 and Ni-based Colmonoy 88 powders. Slurry erosion tests have been conducted on LSAmodified steels for a constant slurry velocity of 12 m/s and for a fixed slurry concentration of 10 kg/m 3 of irregular, sharp-edged SiO 2 particles with average sizes of 375 and 100 lm and at impingement angles of 30, 45, 60, and 90 deg. A mixed (neither ductile nor brittle) mode of erosion behavior for Stellite 6 coatings and a brittle mode of erosion behavior for Colmonoy 88 coatings were observed when these materials were impacted with particles with an average size of 375 lm, whereas only a brittle mode of erosion was observed for both Stellite 6 and Colmonoy 88 coatings when impacted with particles with an average size of 100 lm. Mainly, chip formation, chip fracture, microcutting, plowing, and crater lip and platelet formation were observed for Stellite 6 coatings and progressive fracture of carbides, carbide pullout and carbide/boride intact were observed for the case of Colmonoy 88 coatings.

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“…The most important applications concern surface preparation, surface treatments, machining and welding. [1][2][3][4][5][6] Among the surface properties modified by laser treatment, protection against corrosion is of great importance. Surface modification through laser surface melting is, for instance, often reported to improve the resistance against localised corrosion inherent to stainless steels, such as intergranular corrosion and pitting corrosion.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of martensitic stainless steels by laser marking and its consequences regarding corrosion resistance

Steyer¹,

Valette²,

Forest³

et al. 2006

Surface Engineering

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International audienceMarking is of prime importance in the field of biomaterials to allow the identification of surgical tools or implants. Markings are obtained under industrial conditions with a pulsed Nd:YAG laser on a X30C13 martensitic stainless steel. Depending on laser parameters, two modes of marking are considered: a surface oxidisation mode and a matter photoablation mode. Electrochemical behaviour, i.e. passive state, corrosion rate, resistance to pitting, is evaluated in Ringer's saline solution. Results are then explained on the basis of metallurgical modifications regarding the phases composition and the distribution of alloying elements. In oxidative regime, laser treatment drastically affects both microstructure and chemical composition. Specially, chromium depletion is measured in subsurface, leading to a loss of passive ability. In ablative mode the surface is transformed into a thin favourable layer of austenite. Moreover, the overall chromium distribution is little modified. Therefore, the passive character is maintained, but with nevertheless a shorter passive domain than base material one

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Control of defects during laser surface alloying

Cited by 14 publications

References 16 publications

Influence of microstructure on slurry erosive wear characteristics of laser surface alloyed 13Cr–4Ni steel

Influence of microstructure on slurry erosive wear characteristics of laser surface alloyed 13Cr–4Ni steel

Slurry Erosion Characteristics and Erosive Wear Mechanisms of Co-Based and Ni-Based Coatings Formed by Laser Surface Alloying

Surface modification of martensitic stainless steels by laser marking and its consequences regarding corrosion resistance

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