Wear Mechanism of ADI

2012 ◽  
Vol 445 ◽  
pp. 673-678
Author(s):  
Bijan Abbasi Khazaei
Keyword(s):  
Carbon Content ◽  
Wear Mechanism ◽  
Sliding Wear ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Dry Sliding Wear ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Wear Tests

In this research wear mechanism of ADI under different intensity of loading with different hardness have been investigated. To study of wear behavior, a series of austempered specimens with optimum mechanical properties were used for wear tests. Dry sliding wear tests were carried out in pin-on-ring wear tester machine at speed of 0.5 ms-1 and loaded with normal loads of 100,200,300 and 400 N. Scanning electron microscopy for microstructure and wear surface analysis was used. To determine the austenite volume fraction and the percentage of carbon content in austenite, X-ray diffraction analysis was used. Results show that the role of retained austenite at wear properties of ADI is dependent on loading intensity and austenite carbon content.

Microstructure and Wear Properties of Fe-Cr-C and Fe-Cr-Si-C Clads on Carbon Steel by TIG Surfacing Process

2009 ◽  
Vol 83-86 ◽  
pp. 1035-1042
Author(s):  
Ghasem Azimi ◽  
Morteza Shamanian
Keyword(s):  
Heat Source ◽  
Sliding Wear ◽  
Volume Fraction ◽  
Dry Sliding Wear ◽  
Surface Alloying ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Alloyed Surface ◽  
St52 Steel ◽  
Wear Tests

In the present study, the surface of St52 steel was alloyed with preplaced powders Fe-Cr-C and Fe-Cr-Si-C by using a tungsten-inert gas (TIG) heat source. Then microstructure of the alloyed surfaces was investigated. Following the surface alloying, conventional characterization techniques, such as optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction were employed to study the microstructure of the alloyed surface. Microhardness measurements were performed across the alloyed zone. The tribological behavior of the coatings was compared in room temperature dry sliding wear tests. It was found that the as-deposited coatings consisted of higher volume fraction of carbides (Cr7C3). No crack formation was found on the coatings. As a result, TIG arc heat source can be used effectively for performing surface alloying on St52 steel with a preplaced powder in order to improve its surface wear resistance.

Effects of Surface Coating on Wear Properties of A356-20vol.%SiCp Composites

2007 ◽  
Vol 124-126 ◽  
pp. 1409-1412
Author(s):  
Jung Moo Lee ◽  
Suk Bong Kang ◽  
Jian Min Han
Keyword(s):  
Surface Coating ◽  
Sliding Wear ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Wear Properties ◽  
Pin On Disc ◽  
Micro Arc Oxidation ◽  
Worn Surface ◽  
Wear Tests

Thick alumina coatings were performed on A356-20vol.% SiCp composites by micro-arc oxidation (MAO) process with different processing time. The dry sliding wear tests were performed on A356-20vol.% SiCp composites with and without surface coating. The samples were tested by pin-on-disc wear test equipment with different applied load and sliding velocity. It is revealed that MAO coating improves resistance to wear of A356-20vol.% SiCp composites in the severe wear conditions. On the basis of the observations and analysis of the worn surface, worn subsurface, wear debris and variation of friction coefficient, the role of MAO coating layer is examined.

scholarly journals The Kinetics and Dry-Sliding Wear Properties of Boronized Gray Cast Iron

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Dong Mu ◽  
Bao-luo Shen
Keyword(s):  
Cast Iron ◽  
Sliding Wear ◽  
Single Phase ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Wear Tests

Some properties of boride formed on gray cast iron (GCI) have been investigated. GCI was boronized by powder-pack method using Commercial LSB-II powders at 1123, 1173, and 1223 K for 2, 4, 6, and 8 h, respectively. Scanning electron microscopy showed that boride formed on the surface of boronized GCI had tooth-shaped morphology. The hardness of boride formed on surfaces of GCI ranged from 1619 to 1343 HV0.025, and quenched and tempered GCI ranged from 400 to 610 HV0.025. The boride formed in the coating layer confirmed by X-ray diffraction analysis was Fe2B single phase. Depending on boronizing time and temperature, the thickness of coating layers on boronized GCI ranged from 26 to 105 μm. The activation energy was 209 kJ/mol for boronized GCI. Moreover, the possibility of predicting the iso-thickness of boride layers variation was studied. Dry-sliding wear tests showed that the wear resistance of boronized sample was greater than that of quenched and tempered sample.

Influence of reinforcing fiber on the dry sliding wear behavior of hybrid fabric/benzoxazine composites

2019 ◽  
Vol 89 (23-24) ◽  
pp. 5153-5164
Author(s):  
Meng Su ◽  
Lei Liang ◽  
Fang Ren ◽  
Weigang Yao ◽  
Mingming Yu ◽  
...  
Keyword(s):  
High Temperatures ◽  
Tribological Properties ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Wear Test ◽  
Mechanical Analysis ◽  
Dry Sliding Wear ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Wear Tests

Hybrid polyimide (PI)-polytetrafluoroethylene (PTFE)/Nomex fabric composites and Nomex-PTFE/Nomex fabric composites were prepared with benzoxazine (BOZ) as the resin binder. The tribological properties and wear mechanisms of the two composites at different temperatures were investigated using a ball-on-disk wear tester. Before sliding wear tests, a thermo-aging test, thermogravimetric analysis and dynamic mechanical analysis of PI and Nomex fibers were performed to evaluate the thermal properties of the two reinforcing fibers. After each wear test, scanning electron microscopy was employed to analyze the morphologies of the worn surfaces of the composite. The results of sliding wear tests show that the difference between the tribological properties of the two composites is small at room temperature. However, the hybrid PI-PTFE/Nomex fabric composite achieves better tribological properties at high temperatures compared with the hybrid Nomex-PTFE/Nomex fabric composite, which suffered wear failure at 240℃. It is proposed that the excellent thermal mechanical property and thermal stability of PI fibers is the main factor that endows the PI-PTFE/Nomex/BOZ composite with a more favorable tribological property at high temperatures. Moreover, the influence of the increasing temperature on the tribological properties of the two composites was also investigated.

scholarly journals Differences in Dry Sliding Wear Behavior between Al–12Si–CuNiMg Alloy and Its Composite Reinforced with Al2O3 Fibers

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1749 ◽  
Author(s):  
Qing Zhang ◽  
Jie Gu ◽  
Shuo Wei ◽  
Ming Qi
Keyword(s):  
Sliding Wear ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Testing Machine ◽  
Matrix Alloy ◽  
Wear Testing ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
The Matrix ◽  
Pin On Disk

The dry sliding wear behavior of the Al-12Si-CuNiMg matrix alloy and its composite reinforced with Al2O3 fibers was investigated using a pin-on-disk wear-testing machine. The volume fraction of Al2O3 fibers in the composite was 17 vol.%. Wear tests are conducted under normal loads of 2.5, 5.0, and 7.5 N, and sliding velocities of 0.25, 0.50, and 1.0 m/s. Furthermore, the worn surfaces of the matrix alloy and the composite were examined using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that the wear resistance of the composite was inferior to that of the matrix alloy, which could be attributed to the high content of reinforcement and casting porosities in the composite. Worn-surface analysis indicates that the dominant wear mechanisms of both materials were abrasive wear and adhesive wear under the present testing conditions.

Microstructure and Wear Properties of In Situ TiC-Cr7C3/Fe Surface Composite

2011 ◽  
Vol 415-417 ◽  
pp. 170-173
Author(s):  
Jing Wang ◽  
Si Jing Fu ◽  
Yi Chao Ding ◽  
Yi San Wang
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Test Machine ◽  
Wear Properties ◽  
Surface Composite ◽  
The Matrix

A wear resistant TiC-Cr7C3/Fe surface composite was produced by cast technique and in-situ synthesis technique. The microstructure and dry-sliding wear behavior of the surface composite was investigated using scanning electron microscope(SEM), X-ray diffraction(XRD) and MM-200 wear test machine. The results show that the surface composite consists of TiC and Cr7C3as the reinforcing phase, α-Fe and γ-Fe as the matrix. The surface composite has excellent wear-resistance under dry-sliding wear test condition with heavy loads.

Influence of Tempering Temperature and Microstructure on Wear Properties of Low Alloy PM Steel with 1-2 % Ni Addition

2007 ◽  
Vol 534-536 ◽  
pp. 629-632
Author(s):  
Süleyman Tekeli ◽  
Ahmet Güral ◽  
Metin Gürü
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Constant Load ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Wear Properties ◽  
Wear Coefficient ◽  
Tempering Temperature ◽  
Pin On Disk ◽  
Cold Pressed

The effect of tempering temperature and microstructure on dry sliding wear behavior of quenched and tempered PM steels was investigated. For this purpose, atomized iron powder was mixed with 0.3 % graphite and 1-2 % Ni powders. The mixed powders were cold pressed and sintered at 1200°C. The sintered specimens were quenched from 890°C and then tempered at 200°C and 600°C for 1 hr. Wear tests were carried out on the quenched+tempered specimens under dry sliding wear conditions using a pin-on-disk type machine at constant load and speed. The experimental results showed that the wear coefficient effectively increased with increasing tempering temperature. With increasing Ni content, the wear coefficient slightly decreased at all tempering temperatures due to the high amount of Ni-rich austenitic areas.

Effect of Repeated Quenching Heat Treatment on Microstructure and Dry Sliding Wear Behavior of Low Carbon PM Steel

2007 ◽  
Vol 534-536 ◽  
pp. 673-676 ◽  
Author(s):  
Ahmet Güral ◽  
Süleyman Tekeli ◽  
Dursun Özyürek ◽  
Metin Gürü
Keyword(s):  
Heat Treatment ◽  
Sliding Wear ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Constant Load ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Low Carbon ◽  
Ar Gas ◽  
Pin On Disk

The effect of repeated quenching heat treatment on microstructure and dry sliding wear behavior of low carbon PM steel was investigated. For this purpose, atomized iron powder was mixed with 0.3 % graphite and 1 % Ni powders. The mixed powders were cold pressed and sintered at 1200°C for 30 min under pure Ar gas atmosphere. Some of the sintered specimens were intercritically annealed at 760°C and quenched in water (single quenching). The other sintered specimens were first fully austenized at 890°C and water quenched. These specimens were then intercritically annealed at 760°C and re-quenched in water. The martensite volume fraction in the double quenched specimens was higher than that of the single quenched specimen. Wear tests were carried out on the single and double quenched specimens under dry sliding wear condition using a pin-on-disk type machine at constant load and speed. The experimental results showed that the wear coefficient effectively decreased in the double quenched specimen.

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