Raman Spectroscopy of Multilayered AlCrN Coating under High Temperature Sliding/Oxidation

2019 ◽  
Vol 799 ◽  
pp. 9-14
Author(s):  
Janis Baronins ◽  
Maksim Antonov ◽  
Sergei Bereznev ◽  
Taavi Raadik ◽  
Irina Hussainova
Keyword(s):  
Raman Spectroscopy ◽  
Stainless Steel ◽  
High Temperature ◽  
Room Temperature ◽  
Normal Load ◽  
Sliding Speed ◽  
Applied Normal Load ◽  
Pvd Coating ◽  
Static Oxidation

The multilayered AlCrN coating physical vapour deposited (PVD) over the stainless steel (SS) substrate was studied. Raman spectroscopy was used to determine the resistance of the coating under high temperature oxidative conditions (25–800 °C). Static oxidation tests of the AlCrN PVD coating mainly leads to the formation of Cr2O3 at temperatures up to 800 °C. The results of the sliding tests indicate the development of oxides layers in the wear tracks on the surface of AlCrN PVD coated samples at the room temperature, which is critically dependant on the sliding speed against Si3N4 counter balls. The maximum reliable sliding speeds against Si3N4 counter balls under applied normal load of 3 N at 20, 300/500 and 800 °C was determined to be 0.486, 0.162 and 0.054 m·s-1, respectively.

Effect of a-CNx Coating on Tribological Properties of SiC Ceramic in Water

2005 ◽  
Vol 475-479 ◽  
pp. 2899-2904 ◽  
Author(s):  
Fei Zhou ◽  
Koji Kato ◽  
Koshi Adachi
Keyword(s):  
Room Temperature ◽  
Normal Load ◽  
Film Surface ◽  
Mean Value ◽  
Low Velocity ◽  
Sliding Speed ◽  
Wear Rates ◽  
Sic Ceramic ◽  
Constant Normal Load ◽  
The Mean

The tribological behaviors of a-CNx/SiC tribo-pairs in water at low velocity were investigated and compared with SiC/SiC at room temperature. The results showed that the mean value µ of friction coefficients at steady state for a-CNx/SiC tribo-pairs (µ=0.075~0.12) was lower than that of SiC/SiC systems (µ=0.24~0.27). At a constant sliding speed, µ for two kinds of tribo-couples decreased with an increase in normal load, but at a constant normal load, µ for SiC/SiC system was nearly independence of sliding speed, whereas that of a-CNx/SiC tribo-pair decreased with sliding speed. The specific wear rates (ws) of ball and disk for a-CNx/SiC tribo-couples were considerably reduced by a factor up to 10 in the comparison to those of SiC/SiC systems. The observations of wear scars showed that the wear mechanism of CNx coating was micro-fracture of irregularities on the film surface for build-up of tribolayer, while that of SiC/SiC system was dominated by mechanical wear.

Transition of Wear Mechanisms of Plasma Source Nitrided AISI 316 Austenitic Stainless Steel Against Ceramic Counterface

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
G. Y. Li ◽  
Z. Y. Wang ◽  
M. K. Lei
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Normal Load ◽  
Plasma Source ◽  
Specific Wear Rate ◽  
Phase Layer ◽  
Sliding Speed ◽  
Aisi 316

A single high-nitrogen face-centered-cubic (f.c.c.) phase (γN) layer formed on the plasma source nitrided AISI 316 austenitic stainless steel at a nitriding temperature of 450 °C for a nitriding time of 6 h. An approximately 17 μm-thick γN layer has a peak nitrogen concentration of about 20 at. %. Tribological properties of the γN phase layer on a ball-on-disk tribometer against an Si3N4 ceramic counterface under a normal load of 2 and 6 N with a sliding speed of 0.15 to 0.29 m/s were investigated by friction coefficient and specific wear rate measurement. Worn surface morphology and wear debris were characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The microhardness of the γN phase layer on the nitrided stainless steel was measured as about 15.1 GPa. The change in the friction coefficient of the γN phase layer on the stainless steel was dependent on the applied normal load, which was associated with that in the specific wear rate. Under a lower normal load of 2 N, the lower specific wear rate of the γN phase layer with a sliding speed of 0.15 m/s was obtained as 2.8 × 10−6 mm3/N m with a friction coefficient of 0.60. Under a higher normal load of 6 N, the lower specific wear rate with a sliding speed of 0.29 m/s was 7.9 × 10−6 mm3/N m with a friction coefficient of 0.80. When the applied load increased from 2 to 6 N, a transition of the wear mechanisms from oxidative to abrasive wear was found, which was derived from the oxidation reaction and the h.c.p. martensite phase transformation of the γN phase during the wear tests, respectively.

The Influence of High Content of Silicon in Austenitic Stainless Steel to Corrosion Rate in Sulphuric Acid

2014 ◽  
Vol 493 ◽  
pp. 727-732 ◽  
Author(s):  
Femiana Gapsari ◽  
Slamet Wahyudi ◽  
Sumawan
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Austenitic Stainless Steel ◽  
Corrosion Rate ◽  
Sulphuric Acid ◽  
Corrosion Test ◽  
Room Temperature ◽  
Ss 304

This study is aimed at investigating the performance of saramet compared to other austenitic stainless steel (SS) types. Saramet is a type of austenitic SS which contains Silicon (Si) higher than others. The research treatment was divided into 2 activities which were at room temperature and high temperature. The material used were saramet, SS 304 and SS 316L. Corrosion test was conducted by using weight losing method and electrochemical. The findings show that saramet is more resistant to corrosion compared to SS 304 and SS 316L both at high and room temperature. Saramet has better performance at high temperature.

Sliding wear tests of stainless steel couples in water at high temperature, high sliding speed and high load

Wear ◽  
1996 ◽  
Vol 201 (1-2) ◽  
pp. 145-154 ◽  
Author(s):  
Norihisa Saito ◽  
Yukio Hemmi ◽  
Takahisa Arima ◽  
Masayuki Oishi ◽  
Masaru Hosokawa
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Sliding Wear ◽  
High Load ◽  
Sliding Speed ◽  
Wear Tests

Investigation of Friction and Wear Properties of Electroless Ni–P–Cu Coating Under Dry Condition

2016 ◽  
Vol 04 (04) ◽  
pp. 1640013 ◽  
Author(s):  
Santanu Duari ◽  
Arkadeb Mukhopadhyay ◽  
Tapan Kr. Barman ◽  
Prasanta Sahoo
Keyword(s):  
Heat Treatment ◽  
Surface Morphology ◽  
Normal Load ◽  
Wear Depth ◽  
Wear Properties ◽  
Sliding Speed ◽  
Applied Normal Load ◽  
Heat Treated ◽  
Pin On Disc ◽  
Electroless Ni

This study presents the deposition and tribological characterization of electroless Ni–P–Cu coatings deposited on AISI 1040 steel specimens. After deposition, coatings are heat treated at 500[Formula: see text]C for 1[Formula: see text]h. Surface morphology study of the coatings reveals its typical cauliflower like appearance. Composition study of the coatings using energy dispersive X-ray analysis indicates that the deposit lies in the high phosphorus range. The coatings undergo crystallization on heat treatment. A significant improvement in microhardness of the coatings is also observed on heat treatment due to the precipitation of hard crystalline phases. The heat-treated coatings are subjected to sliding wear tests on a pin-on-disc type tribo-tester under dry condition by varying the applied normal load, sliding speed and sliding duration. The coefficient of friction (COF) increases with an increase in the applied normal load while it decreases with an increase in the sliding speed. The wear depth on the other hand increases with an increase in applied normal load as well as sliding speed. The worn surface morphology mainly indicates fracture of the nodules.

scholarly journals High temperature tribology of TiAlN PVD coating sliding against 316L stainless steel and carbide-free bainitic steel

2020 ◽  
pp. 106847
Author(s):  
Pouria Valizadeh Moghaddam ◽  
Braham Prakash ◽  
Esa Vuorinen ◽  
Mikael Fallqvist ◽  
Jon M. Andersson ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
316L Stainless Steel ◽  
Bainitic Steel ◽  
Pvd Coating ◽  
High Temperature Tribology

Fretting Wear of T800 Coating in Aero-Engine Applications

2020 ◽  
Author(s):  
Mario Lavella ◽  
Daniele Botto
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Temperature ◽  
Dry Friction ◽  
Room Temperature ◽  
Normal Load ◽  
Point Contact ◽  
Dissipated Energy ◽  
Scanning Electron ◽  
Worn Surfaces

Abstract High cycle fatigue in blades is triggered by oscillating forces. Devices such as shrouds, that exploit dry friction, are commonly introduced in the blade assembly to reduce the blade vibrations. If severe wear occurs, the effectiveness of the dry friction damping decreases, vibrations increase, and the number of cycles to failure of the blade diminishes. Mating surfaces in shrouds undergo high loads combined with relative displacement of low amplitude. This is the typical condition known as fretting. Coatings are commonly applied on damping surfaces of turbine blades to mitigate wear. This study investigates the wear mechanism of contact interfaces coated by Tribaloy® T-800, a coating greatly used in aeroengines. The experimental campaign was performed with a point contact test rig. The investigation was carried out using as test parameters temperature, normal load and fretting amplitude. Nine sets of parameters were analyzed at different test durations. Friction coefficients were computed using the hysteresis loops measured during the fretting tests. The worn surfaces were measured by an optical equipment based on focus variation and the volume losses were accurately measured. The wear region was observed by scanning electron microscopy at the end of each test. At room temperature, the friction coefficient was found substantially independent of the normal load. The wear rates at room temperature were higher than at high temperature. Observation of the worn surfaces by scanning electron microscopy revealed several brittle cracks. The damage mechanism changes from brittle (at room temperature) to ductile (at high temperature). The volume loss as a function of the dissipated energy was found independent of the normal load, showing that dissipated energy is a better variable rather than the number of wear cycles to show results of wear tests.

Microstructural characterization and mechanical behavior of Cr25Ni35NbM alloy dissimilar weld joint for application in a hydrogen reformer furnace

2020 ◽  
Vol 117 (6) ◽  
pp. 612
Author(s):  
Jingfeng Guo ◽  
Wenwen Liu ◽  
Chunxiu Li ◽  
Xiaoming Zhang
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Weld Joint ◽  
Room Temperature ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Dissimilar Weld ◽  
Weld Joints

The microstructural characterization and mechanical behavior of Cr25Ni35NbM/15CrMo and Cr25Ni35NbM/SUS321 dissimilar weld joints were studied in this paper. The microstructure, room temperature and high temperature (1173 K) tensile strength of dissimilar weld joints were analyzed through optical microscopy (OM), scanning electron microscopy (SEM) and electronic universal tensile testing machine. The microstructure of HAZ in 15CrMo steel of Cr25Ni35NbM/15CrMo dissimilar weld joint transformed from ferrite-pearlite into ferrite-martensite. A large volume fraction of α phase was found to have precipitated in the HAZ of SUS321 austenitic stainless steel for Cr25Ni35NbM/SUS321 dissimilar weld joint. At room temperature, the tensile strength and yield strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. The high temperature tensile strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. Both at room and high temperature, the fracture locations of two types dissimilar weld joints are the HAZ of the base metal 15CrMo and SUS321 stainless steel, respectively. It indicates that the weak part of the Cr25Ni35NbM alloy dissimilar weld joints is the low-performance base metals 15CrMo and SUS321 stainless steel.

ALLEGHENY LUDLUM AL 6XN ALLOY

Alloy Digest ◽  
1988 ◽  
Vol 37 (5) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Pressure Vessel ◽  
Room Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Superaustenitic Stainless Steel ◽  
Temperature Performance ◽  
Section Viii

Abstract Allegheny Ludlum AL-6XN alloy is characterized as a superaustenitic stainless steel having an exceptional level of corrosion resistance, especially to chloride pitting. It has high strength and its impact value at room temperature is 140 ft-lb and at 320 F (196 C) is 85 ft-lb. It is covered by ASME Boiler and Pressure Vessel Code (Case 1997 for Section VIII and Case N-438 for Section III Construction). This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-494. Producer or source: Allegheny Ludlum Corporation.

Effect of Micro-Size Cenosphere Content on Friction and Dry Sliding Wear Behavior of Vinylester Composites – A Taguchi Method

2012 ◽  
Vol 585 ◽  
pp. 569-573 ◽  
Author(s):  
S.R. Chauhan ◽  
Sunil Thakur
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Sliding Wear ◽  
Friction And Wear ◽  
Normal Load ◽  
Dry Sliding ◽  
Sliding Speed ◽  
Applied Normal Load ◽  
The Coefficient Of Friction ◽  
Sliding Distance

In this paper the friction and wear characteristics of vinylester and vinylester composites have been investigated under dry sliding conditions for different applied normal load, sliding speed and sliding distance. The experiments have been carried on a pin on disc arrangement at normal room temperature conditions. The influence of friction and wear parameters like normal load, speed, sliding distance and percentage of filler content on the friction and wear rate has been investigated. In this study, a plan of experiments based on the techniques of Taguchi was performed to acquire data in a controlled way. An orthogonal array L27 (313) and Analysis of variance (ANOVA) were applied to investigate the influence of process parameters on the coefficient of friction and sliding wear behaviour of these composites. The Taguchi design of experiment approach eliminates the need for repeated experiments and thus saves time, material and cost. The results showed that with increase in the applied normal load and sliding speed the coefficient of friction and specific wear rate decreases under dry sliding conditions. It is also found that a thin film formed on the counterface seems to be effective in improving the tribological characteristics. The results showed that the inclusion of cenosphere as filler materials in vinylester composites will increase the wear resistance of the composite significantly.

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