Effect of deep rolling on subsurface conditions of CoCr28Mo6 wrought alloy to improve the wear resistance of endoprostheses

Herbster, Maria; Harnisch, Karsten; Haberland, Eva; Kriegel, Paulina; Döbberthin, Christin; Heyn, A.; Döring, J.; Lohmann, Christoph H.; Bertrand, Jessica; Halle, Thorsten

doi:10.1016/j.jmbbm.2021.104398

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…Ultrasonic impact on the metal surface can effectively improve the hardness of 316L. This effect was most pronounced in the range of a few tens of micrometers, up to about 600 μm, which was agreement with the results concluded by Herbster et al [ 12 ]. In accordance with the law reflected in the Hall-patch equation, this explained why the cross-sectional hardness of modified 316L decreased abruptly after a few tens of microns.…”

Section: Resultssupporting

confidence: 92%

Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

Zhu,

Zhuang,

et al. 2024

PLoS ONE

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In the present study, effect of ultrasonic impact treatment (UIT) on the microstructural characterization and mechanical properties of 316L stainless steel (hereinafter referred to as 316L) was investigated experimentally. The fatigue fracture mechanism of 316L before and after UIT was revealed. The experimental results indicated that the martensitic grain size induced at the impact edge was about 2.00 Å. The surface modified 316L formed a gradient nanostructure and induced a martensitic phase transformation. The hardness of the surface layer of the modified 316L was twice the hardness of its matrix. The tensile strengths of 316L before and after UIT were 576 MPa and 703 MPa, respectively. The stretching stripes of 316L were more disordered after UIT. The fatigue strengths of 316L before and after UIT were 267 MPa and 327 MPa, respectively. The fatigue cracking of 316L started from the austenite grain boundaries. The fatigue fracture surface was relatively rough. The fatigue crack sources of the modified 316L came from internal inclusions. The inclusions were oxides dominated by SiO2. As the stress range increased, the crack initiation site migrated to the interior and the fatigue fracture surface became flatter.

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Section: Resultssupporting

confidence: 92%

Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

Zhu,

Zhuang,

et al. 2024

PLoS ONE

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“…Through the generation and movement of dislocations as well as by deformation of the grain, the induced stresses in the material are reversed 34 . The stress distribution is presented by the microstructure, such as grain boundaries and defects, as shown for CoCr28Mo6 alloy by Herbster et al In comparison to these results, the phase transformation takes places up to 300 μm below the surface due to the more than five times higher Hertzian contact stress of the tool in this work 35 . This is also the reason for the strong deformed structure in the surface layer.…”

Section: Discussionsupporting

confidence: 47%

“…34 The stress distribution is presented by the microstructure, such as grain boundaries and defects, as shown for CoCr28Mo6 alloy by Herbster et al In comparison to these results, the phase transformation takes places up to 300 μm below the surface due to the more than five times higher Hertzian contact stress of the tool in this work. 35 This is also the reason for the strong deformed structure in the surface layer. Their results show that the formation of the hcp-phase does not increase linearly with increasing strain rate.…”

Section: Discussionmentioning

confidence: 99%

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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Tribology in arthroplasty

Döring,

Bormann,

Buchholz

et al. 2024

Orthopädie

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Effect of deep rolling on subsurface conditions of CoCr28Mo6 wrought alloy to improve the wear resistance of endoprostheses

Cited by 5 publications

References 39 publications

Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

Effect of ultrasonic surface impact on the microstructural characterization and mechanical properties of 316L austenitic stainless steel

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

Tribology in arthroplasty

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