Improving the surface integrity of the CoCrMo alloy by the ball burnishing technique

Silva-Álvarez, D.F.; Márquez-Herrera, A.; Saldaña‐Robles, Adriana; Zapata‐Torres, M.; Mis-Fernández, R.; Peña-Chapa, J.L.; Palmerín, Joel Moreno; Hernández-Rodríguez, E.

doi:10.1016/j.jmrt.2020.05.038

Cited by 28 publications

(18 citation statements)

References 25 publications

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“…In this case, the phase transformation improved the hardness and fatigue limit of samples [47]. Silva-Álvarez et al reported that ball burnishing produces a compressive residual stress on the surface of a metallic substrate [48]. In our case, the ball burnishing produced an increase on the yield stress (see Fig.…”

Section: Effect Of Ball Burnishing Parameters On Tensile Properties Anisotropy and Work Hardeningsupporting

confidence: 60%

Effect of the ball burnishing on the surface quality and mechanical properties of a TRIP steel sheet

Capilla-González

Martínez-Ramírez

Diaz-Infante³

et al. 2021

Int J Adv Manuf Technol

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Ball burnishing is a finishing technique involving plastic deformation on the workpiece surface. In this paper, the influence of the ball burnishing operation on the average roughness, tensile properties, anisotropy and work hardening of a TRIP steel was analyzed. An experimental study of the effect of the ball burnishing process on uniaxial tensile specimens was conducted using the Response Surface Methodology (RSM) based on a 3 2 Factorial Design (FD). The effects of burnishing force (B F ) and the number of tool passes (N P ) on the average roughness (R a ), the yield stress (σ Y ) and the percentage of elongation to fracture (% El) were evaluated. The quadratic regression models were obtained to predict R a and σ Y with determination coefficients (R 2 ) of 0.85 and 0.99, respectively. The results indicated that the ball burnishing process produces a maximum reduction of R a of 81.7% (from 1.250 to 0.229 μm). Also, it was observed that the ductility of the material increased in a 25% and the yield stress and work hardening can be substantially modified. Finally, it was found that by using the ball burnishing process, the planar anisotropy of the sheet can be reduced.

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Section: Effect Of Ball Burnishing Parameters On Tensile Properties Anisotropy and Work Hardeningsupporting

confidence: 60%

Effect of the ball burnishing on the surface quality and mechanical properties of a TRIP steel sheet

Capilla-González

Martínez-Ramírez

Diaz-Infante³

et al. 2021

Int J Adv Manuf Technol

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“…With increasing radial forces at AT, the positive effect of a decreasing surface roughness could be observed, as the surface roughness values S a for TP2 with 1400 N is only 60% of the unrolled TP0. Similar results are shown by Silva‐Alvarez et al for cast CoCr28Mo6 alloy: a decrease in the surface roughness R a of about 50% with their highest applied force of 450 N, one pass and a 6 mm diamond ball 31 . The sub‐zero temperatures of the metalworking fluid leads to a slight increase of the surface roughness.…”

Section: Discussionsupporting

confidence: 85%

Surface integrity modification ofCoCrMoalloy by deep rolling in combination with sub‐zero cooling as potential implant application

et al. 2022

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Alloys made of CoCrMo are well established as implants materials since decades in orthopedic surgery. The good mechanical properties, biocompatibility and especially the corrosion resistance are important rationales for the use of these alloys. Nevertheless, retrieved implants from revision surgery showed the occurrence of abrasion and corrosion. The wear mechanisms and the occurring corrosion processes might be reduced with a functionalization of the surface. The hexagonal phase of the cobalt chromium matrix plays an important role in the surface functionalization. It can be specifically transformed and set during the manufacturing process. One possibility for the induction of the transformation is the use of a deep rolling process in combination with a novel "sub-zero" cooling strategy during machining. The influence of force and temperature during the deep rolling process on the formation of the hexagonal Co-phase is examined in this study. The results from the targeted setting of the hexagonal Co-phase in the subsurface are shown. For this purpose, EBSD studies have been carried out to detect and quantify the proportion of Co-hex phase in the subsurface of the modified alloys. To analyze the mechanical properties, we measured the residual stress and hardness in the near surface layer under conditions close to the application. Furthermore, we performed biological tests to show a potential influence of the modification on the biocompatibility when using the sub-zero cooling approach. We observed no negative effect on the osteoblastic cell line which attached similarly to all tested surfaces. The investigations provide first insights into the potential use of "sub-zero" cooling in modifying orthopedic implant materials, but also the respective limits with regard to the surface functionalization. Deep rolling in combination with an innovative cooling strategy has a great potential to improve the mechanical properties of CoCr28Mo6 wrought alloy, by subsurface hardening and phase transformation.

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“…The relationship between the factors and the performance measures was modeled by linear regression. The regression equations obtained are given below by Eqs (2,3,4,5). These equations have been validated by acceptable correlation coefficients (R 2 ) as shown in the figures below (Fig.…”

Section: Modeling Of Output Responsesmentioning

confidence: 76%

“…Therefore, surface integrity is generally considered an important aim in manufacturing processes to predict service properties and pieces lifetime [3]. Therefore, thorough finishing techniques are needed to rectify the surface integrity after machining which is particularly difficult [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Mechanical Treatment on Mechanical Properties and Impact Behavior of S355JR Steel

Hamadache

Laouar

et al. 2021

Preprint

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Often, surface mechanical treatments (SMT) or heat (quenching, tempering) are used to improve the surface condition and mechanical characteristics such as impact resistance and tensile strength. Hence the objective of this experimental work, where ball burnishing (BB) as well as quenching and tempering were applied on S355 JR steel specimens in order to evaluate the surface hardness "Hv", the rupture strength "Rm", the energy absorbed "W" during the impact test and the work-hardened thickness "e" after the burnishing operation. Factorial designs were used for the tests organization and mathematical models were established for the prediction of "Hv", "Rm", "W" and "e" in function on treatment parameters considered: number of tool passes ( i) and the pressure force (Py). The results show that the surface hardness increases by 30.46%. The high levels of "Py" and "i" were allowed to improve "Rm" by 30.8% as well as an increase in tenacity of only 3.6%. Increasing the force to 20kgf promotes mixed rupture under the effect of impact to shock. The quenching and tempering improve the resistance "Rm" by 183% and 119% respectively, while the effect of burnishing was limited to a rate of increase of this property of 28% compared to machining.

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Improving the surface integrity of the CoCrMo alloy by the ball burnishing technique

Cited by 28 publications

References 25 publications

Effect of the ball burnishing on the surface quality and mechanical properties of a TRIP steel sheet

Effect of the ball burnishing on the surface quality and mechanical properties of a TRIP steel sheet

Surface integrity modification ofCoCrMoalloy by deep rolling in combination with sub‐zero cooling as potential implant application

Effect of Surface Mechanical Treatment on Mechanical Properties and Impact Behavior of S355JR Steel

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Improving the surface integrity of the CoCrMo alloy by the ball burnishing technique

Cited by 28 publications

References 25 publications

Effect of the ball burnishing on the surface quality and mechanical properties of a TRIP steel sheet

Effect of the ball burnishing on the surface quality and mechanical properties of a TRIP steel sheet

Surface integrity modification ofCoCrMoalloy by deep rolling in combination with sub‐zero cooling as potential implant application

Effect of Surface Mechanical Treatment on Mechanical Properties and Impact Behavior of S355JR&nbsp;Steel

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Effect of Surface Mechanical Treatment on Mechanical Properties and Impact Behavior of S355JR Steel