Shape deformation of a piston ring groove by laser surface hardening

Yoon, Kyung-Sup; Kim, W.-B.; Na, S.-J.

doi:10.1016/0257-8972(94)02403-0

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Equation [13] is now the basic governing equation for the martensitic transformation without external stress. Second, in athermal martensitic transformations, once the parent phase is ''strained'' to form martensite, the nonchemical free energy is introduced and accumulates continuously as long as the transformation proceeds and reaches a saturation value immediately before completion of the transformation.…”

Section: A Martensitic Transformations Without External Stressmentioning

confidence: 99%

“…[2] and [3]) have been used extensively to describe the volume fraction of martensitic transformations. [10][11][12][13][14] For example, in the internal variables model for shape-memory alloys, Tanaka et al [10] adapted the exponential form for steels by assuming that the martensite fraction () for shape memory-alloys is an exponential function of temperature (T) and uniaxial stress (); thus,…”

Section: Introductionmentioning

confidence: 99%

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A new model for the volume fraction of martensitic transformations

1997

Metall Mater Trans A

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A model using an energy balance is proposed to describe the volume fraction of multiple-interface martensitic transformations. For martensitic transformations without external stresses at quenching temperature T Ͻ M s , the volume fraction of martensite () is proportional to the undercooling (M s Ϫ T) and inversely proportional to a linear function of the quenching temperature (T); thus, ϭwhere ␤ is a material constant. For stress-induced martensitic transformations under stress with temperature T Ͼ M s , the relationship is ϭ 0 [1 Ϫ ( Ϫ a a ik ik ik )] Ϫ1 , where 0 is the initial detectable amount of martensite formed at martensitic starting stress Ms ik and is a material constant. It is found that the results obtained from this model are in good M s ik ik agreement with experimental results.

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Section: A Martensitic Transformations Without External Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new model for the volume fraction of martensitic transformations

1997

Metall Mater Trans A

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“…The scale of such engineered coatings and surface treatments used in reciprocating assemblies are widespread, cover diverse compositions and deposition techniques. the surface treatments applied to cylinder liners include laser texturing, honing, surface indentation, while as the surface tailoring of piston rings include deposition techniques such as, thermal spraying, galvanic deposition, cathodic arcdeposition, laser surface alloying and surface treatments used are shock hardening, surface nitriding, surface hardening with iron-nitride structure grading on ring surface region [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Evaluating Scuffing Failure in Dry Sliding Conditions of Monolayer Chromium Piston Ring/Bulk Grey Cast Iron Liner Interface

Fayaz

Wàňi

2020

Tribology Online

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This research reports the scuffing failure phenomenon of piston ring-cylinder liner in pilot state bench tests. Initially, microhardness evaluation of chromium sprayed piston rings of functionally graded Aluminium A390 piston was conducted using a Vickers hardness Indenter following ASTM E-384 standard. The tribological characterization for dry sliding, simulating lubrication starvation was evaluated using reciprocating Universal Tribometer. For surface morphology and allied surface characterization, Energy Dispersive X-Ray spectroscopy integrated Scanning Electron Microscope was used. Substantially large volumes of wear depicting abnormal wear have been observed on the tribo-conjugate grey CI cylinder liner surfaces in sliding with chromium coating on SAE9254 grade steel substrate. This can be attributed to the considerable hardness gradient of tribopair in conjugation. With chromium coating having a conspicuous hardness edge over the CI cylinder liner, the extrusion and ploughing of the liner surface depict the abnormality in wear. The Coefficient of Friction (COF) under dry sliding with stepped load increments showed an unsteady state of friction and this performance is underrated for operation of any tribological system.

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“…Nevertheless, in case of workpiece with slim geometry, the thermal stress after the treatment induces a sensible deformation on the treatment direction; this deformation can deeply affect the part ability to fulfil its function and/or its reliability. In literature several articles, both mathematical and numerical, are available to estimate the residual stress due to laser hardening in case of slender parts [5][6][7][8][9]. However, these models are vary useful to predict the deformation induced but no solutions are proposed to reduce the effect.…”

mentioning

confidence: 99%

Counter Laser Treatment for Recovering Deformation of Slender Workpiece

Giorleo

Ceretti

Giardini

et al. 2011

KEM

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Laser hardening, compared to other surface hardening processes, presents several advantages: it can be extremely selective and almost without distortion, it achieves higher levels of hardness and thanks to the rapidity of the heating phase it does not require a quenching medium as the material surrounding the heated layer acts as a heat sink. Nevertheless, in case of workpiece with slim geometry, the thermal stress after the treatment induces a sensible deformation on the treatment direction; this deformation can deeply affect the part ability to fulfil its function and/or its reliability. In this paper a solution to recover the workpiece function ability is presented: a second laser treatment (called counter treatment) was executed on the opposite surface of the treated one to reduce the deformation induced by the first treatment. A numerical model was firstly tested and then used to simulate the counter treatment process and to evaluate the optimum process parameters. Based on the numerical analysis, experimental results show that thanks to this technique it is possible to recover up to 80% of the induced deformation.

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Shape deformation of a piston ring groove by laser surface hardening

Cited by 5 publications

References 7 publications

A new model for the volume fraction of martensitic transformations

A new model for the volume fraction of martensitic transformations

Evaluating Scuffing Failure in Dry Sliding Conditions of Monolayer Chromium Piston Ring/Bulk Grey Cast Iron Liner Interface

Counter Laser Treatment for Recovering Deformation of Slender Workpiece

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