Enhancement of Fatigue Properties in Sensor Element by Surface Modification

In order to clarify the effects of nitriding and hybrid surface modification process combining nitriding and induction hardening on fatigue properties of SCM435H steel, high cycle fatigue tests were carried out with a rotational bending machine at room temperature. Observations of fracture surfaces and measurement of hardness and residual stress distributions were carried out to investigate the fracture mechanism. It was revealed that hybrid surface modification process generated a compressive residual stress field and hardened even at center of the specimen. Fatigue strength of hybrid surface modified specimens was much higher than that of substrate and nitrided specimens. This was because a transition of fracture mode from internal to surface fracture; fatigue fracture of nitrided specimens occurred at inside of the hardened layer, in the case of hybrid surface modified specimens, however, fatigue crack initiated at the surface of the specimen with higher hardness and higher compressive residual stress.

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Study on Al Alloy Surfaces Treated by Ion Beams

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.211 ◽

2007 ◽

Vol 561-565 ◽

pp. 211-214

Author(s):

Yu Lan Li ◽

Xiao Dong Peng ◽

Wei Dong Xie

Keyword(s):

Corrosion Resistance ◽

Surface Layer ◽

Surface Modification ◽

Ion Beam ◽

Ion Bombardment ◽

Ion Beams ◽

Fatigue Properties ◽

Al Alloy ◽

Bending Fatigue ◽

Beam Parameters

Plasma-enhanced ion beams are used for the surface modification of 2024 Al and 7075 Al alloy samples. The morphology of the treated surface of the samples is examined. The corrosion resistance and bending fatigue properties were measured on the treated and untreated samples. The effects of ion beam parameters are discussed. It is indicated that during the ion bombardment, craters are formed and surface melting is produced on the treated surfaces. The effects of ion beam bombardment are limited to the surface layer of samples. With the ion beam energies used in this study, improved corrosion resistance was obtained from the treated surfaces of the samples.

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The Improvement of Tribological and Fatigue Properties of Aluminum Alloy Coated DLC Hybrid Surface Modification

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.72.907 ◽

2006 ◽

Vol 72 (718) ◽

pp. 907-913 ◽

Cited By ~ 6

Author(s):

Hirorou NOMURA ◽

Hiroyuki AKEBONO ◽

Hideto SUZUKI

Keyword(s):

Surface Modification ◽

Aluminum Alloy ◽

Fatigue Properties

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Influence of Superficial Modification of Steels by Materials with Effect of Memory of the Form on Wear-Fatigue Characteristics at Frictional-Cyclic Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.915-916.509 ◽

2014 ◽

Vol 915-916 ◽

pp. 509-514 ◽

Cited By ~ 6

Author(s):

Zh.M. Blednova ◽

Peter Olegovich Rusinov ◽

M.A. Stepanenko

Keyword(s):

Mechanical Properties ◽

Wear Resistance ◽

Surface Modification ◽

Cyclic Loading ◽

Shape Memory ◽

Fractal Structure ◽

Experimental Studies ◽

Fatigue Properties ◽

Fatigue Characteristics ◽

Effect Of Surface

The results of a study of the effect of surface modification of steel materials with shape memory effect based on TiNi, TiNiCu, and NiAl on the functional and mechanical properties of the samples are reported. Experimental studies have shown the efficiency of the developed technologies. A substantial increase in wear resistance, and friction durability under cyclic loading was found. It is shown that the most universal characteristic of wear-fatigue properties is adaptability, which is determined by the multi-fractal structure of the parameterization.

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