The Study of Fatigue Behaviour at the Contact of some Sintered Materials from Powder Based on Iron

Liviu Brânduşan; George Arghir

doi:10.4028/www.scientific.net/AMR.23.115

Paper Titles

On Massive Powder Coating in Ball Milling
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Some Considerations Concerning the Obtaining of Some Ag-SnO₂ Sintered Electrical Contacts for Low Voltage Power Engineering Switching Devices
p.103

Aspects Concerning Rheological Properties of the CIM’s Binder Systems
p.107

Thermomechanical Processing of some Heavy Alloys from the System W-Ni-Fe through Rotary Forging
p.111

The Study of Fatigue Behaviour at the Contact of some Sintered Materials from Powder Based on Iron
p.115

Mathematical Model of the Sintering Process of Iron-Copper Bearings
p.119

Effect of Small Iron, Chromium and Boron Additions as Alloying Elements on Microstructure and Mechanical Properties of Ni₃Al
p.123

On the Mechanical and Physical Properties of Recycled Polymer Matrix Composites Reinforced with Cooper Powder
p.127

On the Mechanical Properties of Cooper–Al₂O₃ Cermets of a Low Reinforcing Level, Processed by Powder Metallurgy
p.131

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The Study of Fatigue Behaviour at the Contact of some Sintered Materials from Powder Based on Iron

Abstract:

The analysis of a large range of sintered parts shows the fact, they are strained at contact fatigue, in most of the cases. The Hertzian pressure, at which materials in contact are subjected, establishes the appearance of variable stress, which records a maximum at some depth under the contact surface. In the case of sintered materials this stress variation conducts to a faster degradation of strained surface than in the case of compact materials. This is because the stress variation establishes a critical state at the level of stress concentrators, generated by pores, standing in material structure, leading to formation of some cracks which may propagate at the level intergranular necks, producing removal for some particles of material. The accomplished research on sintered materials, having different chemical compositions, revealed the fact, at the beginning, that the materials undergo a cold hardening, indicated by a hardness increasing, followed by some cracks generating, accompanied by their extension and material removal. This process develops in the same mode for all investigated materials, but with different intensity.