Effect of Aging on Wear Life of Sputtered MoS2 Films

2005 ◽  
Author(s):  
Kazuhito Sagara ◽  
Mineo Suzuki ◽  
Makoto Nishimura
Keyword(s):  
Stainless Steel ◽  
Room Temperature ◽  
Tribological Performance ◽  
Tenfold Increase ◽  
Wear Life ◽  
Mos2 Film

Sputtered MoS2 films deposited on SUS440C stainless steel disks were stored in a desiccator or in a vacuum of 10−5Pa to examine the effect of aging on their tribological performance. Five years’ storage in a desiccator (25%±5%RH, room temperature) elongated the wear life in a vacuum of sputtered MoS2 films in average by a factor of four. A sputtered MoS2 film stored in a vacuum for seven years showed tenfold increase in wear life when tested in a vacuum.

Preparation of WS2/MoS2/C Composite Films and their Tribological Properties

2009 ◽  
Vol 79-82 ◽  
pp. 711-714
Author(s):  
Lei Zhou ◽  
Gui Lin Yin ◽  
Yu Dong Wang ◽  
Zhen Yu ◽  
Dan Nong He
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Room Temperature ◽  
Composite Films ◽  
Tribological Performance ◽  
Atmospheric Conditions ◽  
Composite Target ◽  
Mos2 Film ◽  
Order Of Magnitude ◽  
The Relationship

WS2/MoS2/C composite lubricating films were prepared in an Ar/C2H2 atmosphere by magnetron reaction-sputtering using a WS2/MoS2 composite target. The relationship between the microstructure and the tribological performance of the films was investigated. The composite film has a compact microstructure, which is shown to have much superior tribological performance with lower friction coefficient and better wear resistance than pure MoS2 film in humid atmospheric conditions at room temperature. An increase in hardness of nearly one order of magnitude was reached, too.

Low Cycle Tension-Tension Fatigue Properties of 316L Stainless Steel Thin Sheets

2011 ◽  
Vol 138-139 ◽  
pp. 832-835
Author(s):  
Yong Jie Liu ◽  
Qing Yuan Wang ◽  
Ren Hui Tian ◽  
Xiao Zhao
Keyword(s):  
Stainless Steel ◽  
Room Temperature ◽  
316L Stainless Steel ◽  
Fatigue Testing ◽  
Fatigue Properties ◽  
Loading Frequency ◽  
Thin Sheets ◽  
Effect Factor ◽  
Mechanical Fatigue ◽  
Tensile Fatigue

In this paper, tensile fatigue properties of 316L stainless steel thin sheets with a thickness of 0.1 mm are studied. The tests are implemented by using micro mechanical fatigue testing sysytem (MMT-250N) at room temperature under tension-tension cyclic loading. The S-N curve of the thin sheets descends continuously at low cycle region. Cyclic σ-N curve and ε-N curve are obtained according to the classical macroscopical fatigue theory. The results agree well with the experimental fatigue data, showing that the traditional fatigue research methods are also suitable for description of MEMS fatigue in a certain extent. The effect factor of frequency was considered in this study and the results show that the fatiuge life and the fatigue strength are increased as loading frequency increasing.

The prediction of the cyclic mechanical behavior of stainless steel 304L at room temperature

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hala Messai ◽  
Salim Meziani ◽  
Athmane Fouathia
Keyword(s):  
Stainless Steel ◽  
Design Methodology ◽  
Room Temperature ◽  
Type Model ◽  
Good Prediction ◽  
304L Stainless Steel ◽  
Content Type ◽  
The Third ◽  
Chaboche Model

Purpose The purpose of this paper is to highlight the performance of the Chaboche model in relation to the database identification, tests with imposed deformations were conducted at room temperature on 304L stainless steel specimens. Design/methodology/approach The first two tests were performed in tension-compression between ±0.005 and ±0.01; in the third test, each cycle is composed of the combination of a compression tensile cycle between ±0.01 followed by a torsion cycle between ±0.01723 (non-proportional path), and the last, uniaxial ratcheting test with a mean stress between 250 MPa and −150 MPa. Several identifications of a Chaboche-type model were then performed by considering databases composed of one or more of the cited tests. On the basis of these identifications, the simulations of a large number of ratchet tests in particular were carried out. Findings The results present the effect of the optimized parameters on the prediction of the behavior of materials which is reported in the graphs, Optimizations 1 and 2 of first and second tests and Optimization 4 of the third test giving a good prediction of the increasing/decreasing pre-deformation amplitude. Originality/value The quality of the model's predictions strongly depends on the richness of the database used for the identification of the parameters.

Hydrogen Transport and Hydrogen-Assisted Cracking in SUS304 Stainless Steel During Deformation at Low Temperatures

2015 ◽  
Author(s):  
Lin Zhang ◽  
Bai An ◽  
Takashi Iijima ◽  
Chris San Marchi ◽  
Brian Somerday
Keyword(s):  
Stainless Steel ◽  
Hydrogen Embrittlement ◽  
Room Temperature ◽  
Hydrogen Release ◽  
Hydrogen Transport ◽  
Force Microscopy ◽  
Atomic Force ◽  
Strain Induced Martensite ◽  
Hydrogen Assisted Cracking ◽  
Slip Planes

The behaviors of hydrogen transport and hydrogen-assisted cracking in hydrogen-precharged SUS304 austenitic stainless steel sheets in a temperature range from 177 to 298 K are investigated by a combined tensile and hydrogen release experiment as well as magnetic force microscopy (MFM) based on atomic force microscopy (AFM). It is observed that the hydrogen embrittlement increases with decreasing temperature, reaches a maximum at around 218 K, and then decreases with further temperature decrease. The hydrogen release rate increases with increasing strain until fracture at room temperature but remains near zero level at and below 218 K except for some small distinct release peaks. The MFM observations reveal that fracture occurs at phase boundaries along slip planes at room temperature and twin boundaries at 218 K. The role of strain-induced martensite in the hydrogen transport and hydrogen embrittlement is discussed.

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