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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used to...
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Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
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Steel Manufacturing01:26

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Journal Bearings01:23

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Determining Tribocorrosion Rate and Wear-Corrosion Synergy of Bulk and Thin Film Aluminum Alloys
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The tribological difference between biomedical steels and CoCrMo-alloys.

Alfons Fischer1, Sabine Weiss, Markus A Wimmer

  • 1Materials Science and Engineering, University of Duisburg-Essen, Duisburg, Germany. alfons.fischer@uni-due.de

Journal of the Mechanical Behavior of Biomedical Materials
|April 14, 2012
PubMed
Summary

Cobalt-base alloys perform well in orthopedic implants due to a self-lubricating tribomaterial. Understanding cyclic creep and slip behavior is key to improving wear resistance in stainless steels for better implant longevity.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Orthopedic Surgery

Background:

  • Self-mating metal alloys are used in orthopedic surgery for sliding wear applications.
  • Cobalt-base alloys show good clinical results in implants like hip joints, forming a beneficial tribomaterial.
  • Stainless steels, despite forming tribomaterials, were historically deemed unsuitable for these applications.

Purpose of the Study:

  • To investigate the cyclic creep characteristics within the shear zone as a critical factor for wear behavior in orthopedic implant materials.
  • To compare the wear mechanisms and particle generation of different austenitic materials.
  • To elucidate the metallurgical reasons behind the failure of certain stainless steels in boundary-lubricated sliding wear systems.

Main Methods:

  • Sliding wear tests
  • Torsional fatigue tests
  • Electron microscopy analysis
  • Characterization of tribomaterial formation and subsurface deformation

Main Results:

  • Austenitic materials generate either nano- or microsize wear particles.
  • Microsize particle formation is linked to crack initiation and propagation in the shear fatigue zone due to wavy-slip in Ni-containing CrNiMo steels.
  • Ni-free CrMnMo steels exhibiting planar slip produce nanosize wear particles, significantly improving wear behavior compared to Ni-containing steels.
  • Cobalt-base alloys, also showing planar slip, exhibit superior wear performance.

Conclusions:

  • Cyclic creep characteristics and slip behavior (wavy vs. planar) are crucial for wear performance in self-mating orthopedic alloys.
  • Ni-free CrMnMo steels demonstrate improved wear resistance over Ni-containing 316L-type steels due to planar slip and nanosize particle formation.
  • While improved, the wear behavior of optimized stainless steels does not fully match that of CoCrMo alloys, highlighting the importance of metallurgical composition for tribological performance.