Effect of applied pressure on high-stress abrasive wear behavior of hybrid Al–Mg–Si composites

2016 ◽  
Vol 231 (8) ◽  
pp. 1089-1100
Author(s):  
N Ch Kaushik ◽  
RN Rao
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
Applied Pressure ◽  
High Stress ◽  
Matrix Alloy ◽  
Grit Size ◽  
Pin On Disc ◽  
Marginal Improvement

In this experimental investigation, the effect of applied pressure on high-stress abrasive wear resistance characteristics of stir-cast Al 6082-5 wt% SiC-5 wt%Gr (Al–SiC–Gr) hybrid metal matrix composites was studied and compared with its unreinforced matrix alloy and 10 wt% SiC-reinforced (Al–SiC) composites. The tests were carried on pin-on-disc equipment at applied pressures of 0.1–0.3 MPa, sliding distance of 75 m, and SiC abrasive grit size of 100 µm and 200 µm. It was noted that the wear resistance decreases with increase in applied pressure in both as-cast and T6 conditions. The improvement in wear resistance was 1.63 (alloy) to 3.29 m/mm3 (Al–SiC–Gr) in case of lower grit size and applied pressures. However, the marginal improvement of wear resistance was observed i.e. 0.67 (alloy) to 1.05 m/mm3 (Al–SiC–Gr) at higher grit size and applied pressures. Relative wear resistance plots indicate that hybrid composites conceded better wear resistance properties compared to SiC-reinforced composites. The evaluation of wear mechanisms, worn surfaces of the pins, emery papers, and debris was also studied using scanning electron microscopy.

High-stress abrasive wear behavior of Al–Mg–Si hybrid composites using regression analysis

2017 ◽  
Vol 69 (2) ◽  
pp. 149-157 ◽  
Author(s):  
N.C. Kaushik ◽  
R.N. Rao
Keyword(s):  
Abrasive Wear ◽  
Power Law ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
High Stress ◽  
Grit Size ◽  
Wear Properties ◽  
Content Type ◽  
Quadratic Equations ◽  
Abrasive Wear Behavior

Purpose The purpose of the present study is to analyze the wear behavior of developed aluminum hybrid composites under high-stress conditions through developed power law and quadratic equations. Design/methodology/approach The abrasive wear behavior of Al–Mg–Si (Al 6082) alloy reinforced with hard silicon carbide (SiC) and soft graphite (Gr) particulates fabricated by stir casting route was studied at loads of 5-15 N, sliding distance of 75 m and abrasive grit size of 100-200 μm. The power law and quadratic equations were developed to understand the wear behavior with respect to the load applied and the abrasive grit size. The worn surfaces of the test specimens and grit papers were examined under scanning electron microscope. Findings The density and hardness of the hybrid composites decreased when compared to Al–SiC composites, whereas the wear properties improved because of the presence of Gr. There was further improvement in the wear properties of the materials because of T6 heat treatment. The change in abrasive wear mechanism was observed at a grit size of 125 μm when traversed from alloy to hybrid composite as indicated in terms of exponents in the power law equation. The worn surfaces of hybrid composite pins were comparable with those of alloy pins. Practical implications In the automobile sector, components like cylinder liner, piston, crankshafts, brake drums, etc. also undergo abrasive wear along with sliding against the counter surface in working conditions. Originality/value The results prove that better wear resistance was obtained under the abrasion condition.

Abrasive grit size effect on wear depth of stir cast hybrid Al–Mg–Si composites at high stress condition

2017 ◽  
Vol 232 (6) ◽  
pp. 672-684 ◽  
Author(s):  
NCh Kaushik ◽  
Ch Sri Chaitanya ◽  
RN Rao
Keyword(s):  
Size Effect ◽  
Stress Condition ◽  
Hybrid Composites ◽  
High Stress ◽  
Matrix Alloy ◽  
Grit Size ◽  
Wear Depth ◽  
Heat Treated ◽  
Emery Paper ◽  
Sliding Distance

The grit size effect on high stress abrasive wear depth of stir cast hybrid self-lubricating Gr/SiC/Al composites was investigated in both as cast (AC) and heat treated (T6) condition. The tests were done at grit size of 100–200 µm, sliding distance of 75 m and applied loads of 5–15 N. The results obtained were differentiated with matrix alloy and SiC/Al composites. At 15 N load, the wear depth of hybrid composites w.r.t. matrix alloy reduced around 19.6% (at 100 µm grit size) and 16.4% (at 200 µm grit size) in AC condition; 26.9% (at 100 µm grit size) and 27% (at 200 µm grit size) in T6 condition. The wear mechanism was analyzed through wear surface analysis of pin and emery paper.

Investigation of thermochemical boriding effect on wear behavior of a GGG 50 quality as-cast ductile iron

2016 ◽  
Vol 68 (4) ◽  
pp. 476-481 ◽  
Author(s):  
Harun Mindivan
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Ductile Iron ◽  
Room Temperature ◽  
Wear Behavior ◽  
Surface Hardness ◽  
Wear Test ◽  
Content Type ◽  
Pin On Disc ◽  
Cast Ductile Iron

Purpose This study aims to investigate the microstructure and the abrasive wear features of the untreated and pack borided GGG 50 quality ductile iron under various working temperatures. Design/methodology/approach GGG 50 quality as-cast ductile iron samples were pack borided in Ekabor II powder at 900°C for 3 h, followed by furnace cooling. Structural characterization was made by optical microscopy. Mechanical characterization was made by hardness and pin-on-disc wear test. Pin-on-disc test was conducted on a 240-mesh Al2O3 abrasive paper at various temperatures in between 25 and 450°C. Findings Room temperature abrasive wear resistance of the borided ductile iron increased with an increase in its surface hardness. High-temperature abrasive wear resistances of the borided ductile iron linearly decreased with an increase in test temperature. However, the untreated ductile iron exhibited relatively high resistance to abrasion at a temperature of 150°C. Originality/value This study can be a practical reference and offers insight into the effects of boriding process on the increase of room temperature wear resistance. However, above 150°C, the untreated ductile iron exhibited similar abrasive wear performance as compared to the borided ductile iron.

Abrasive Wear Characteristics of Ni-base Self-fluxing Alloy Spraywelding Overlays

1997 ◽  
Author(s):  
Z. Ding ◽  
R. Knight ◽  
R.W. Smith
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Process Parameters ◽  
High Stress ◽  
Resistance Mechanisms ◽  
Abrasive Wear Resistance ◽  
Abrasive Medium ◽  
Hardness Tests ◽  
Pin On Disc ◽  
Wear Tests

Abstract The results of low stress, pin-on-disc and high stress grinding abrasive wear tests on coatings produced by plasma and oxy-acetylene flame spraywelding are presented. FNil5A and FNiWC35 Ni-based self-fluxing alloys were selected as typical spraywelding materials for abrasive wear resistance. The abrasive wear resistance mechanisms of welded overlays produced by various materials and processes were also characterized by hardness tests, microstructural and compositional analyses, and through analysis of the effect of different kinds of abrasive on the wear resistant of Ni-base self-fluxing spraywelding overlays. Results showed that FNiWC35 overlays exhibited improved resistance under low stress abrasion, but the relative wear resistances of FNiWC35 and FNil5A still depended primarily on the type and hardness of the abrasive medium used. For the same material, the abrasive wear resistance of oxyacetylene flame sprayed overlays was higher than that produced by plasma spraywelding. The wear resistance of the plasma spraywelding overlays depended not only on the material, but also strongly on the spraywelding process parameters.

scholarly journals Investigation of Mechanical and Wear Properties of LM24/Silicate/Fly Ash Hybrid Composite Using Vortex Technique

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
B. R. Senthil Kumar ◽  
M. Thiagarajan ◽  
K. Chandrasekaran
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Fly Ash ◽  
Hybrid Composite ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
Wear Properties ◽  
Alloy Matrix ◽  
Pin On Disc ◽  
Wear Reduction

This work has investigated to find the influence of silicate on the wear behavior of LM 24/4 wt.% fly ash hybrid composite. The investigation reveals the effectiveness of incorporation of silicate in the composite for gaining wear reduction. Silicate particles with fly ash materials were incorporated into aluminum alloy matrix to accomplish reduction in wear resistance and improve the mechanical properties. The LM24/silicate/fly ash hybrid composite was prepared with 4 wt.% fly ash particles with 4, 8, 12, 16, 20, and 24 wt.% of silicate using vortex technique. Tribological properties were evaluated under different load (15, 30, 45, 60, and 75 N); sliding velocity (0.75, 1.5, 2.25, and 3 m/sec) condition using pin on disc apparatus and mechanical properties like density, hardness, impact strength, and tensile strength of composites were investigated. In addition, the machining of the aluminum hybrid composite was studied using Taguchi L9orthogonal array with analysis of variance. The properties of the hybrid composites containing 24 wt.% silicates exhibit the superior wear resistance and mechanical properties.

scholarly journals Microstructure and Wear Behavior of In Situ ZA27/TiB2 Composites

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1663
Author(s):  
Fei Chen ◽  
Binbin Wang ◽  
Zhiqiang Cao
Keyword(s):  
Wear Resistance ◽  
Wear Rate ◽  
Adhesive Wear ◽  
Wear Behavior ◽  
Matrix Alloy ◽  
Dry Sliding Wear ◽  
The Matrix ◽  
Pin On Disc ◽  
Tib2 Particles

In situ ZA27/TiB2 composites were synthesized successfully by diluting the in situ Al/TiB2 composite, which was used as a master alloy. The microstructure and hardness of the developed in situ composites have been investigated. Results have shown that TiB2 particles distribute uniformly through the matrix and significantly refine the matrix grain. The hardness of the composites was higher than that of the matrix alloy and increased with the increasing TiB2 content. The dry sliding wear behavior under heavy loads and high rotation speed were studied in detail by using a pin-on-disc wear tester at room temperature. The results revealed that the wear resistance of the composites increased monotonically with the increase in the TiB2 content. The composites had a lower coefficient of friction, friction temperature, wear rate, and specific wear rate especially under high loads when compared with the matrix alloy. An increase in the applied load increased the wear severity by changing the wear mechanism from abrasion and oxidation to adhesive wear. The composites possess better adhesive wear resistance properties compared with the matrix, which shows obvious adhesive wear as the load increased to 36 N, while the ZA27/3.0% TiB2 composite did not show adhesive wear until the load increased to 54 N.

Tribolayer Behaviour and Wear of Artificially Aged Al6061 Hybrid Composites

2021 ◽  
Vol 18 (2) ◽  
Author(s):  
M. Shettar ◽  
P. Hiremath ◽  
G. Shankar ◽  
A. Kini ◽  
S. Sharma
Keyword(s):  
Wear Resistance ◽  
Hybrid Composites ◽  
Matrix Material ◽  
Research Work ◽  
Matrix Alloy ◽  
Testing Procedure ◽  
Secondary Phases ◽  
Weight Percentage ◽  
Ageing Treatment ◽  
State Process

The current work focuses on enhancing wear resistance due to the presence of reinforcements and the effect of ageing treatment on hybrid composites of Al6061-SiC+B4C. By varying weight percentage, two kinds of reinforcements, viz. silicon carbide and boron carbide, were prepared for hybrid composites by the liquid state process known as the method of stir casting. The solutionising temperature of 550 °C for 2 hours and ageing temperature of 100-200°C at different time intervals were used for both Al6061 alloy and its composites during heat treatment. Microstructural and mechanical characterisation were carried out using a standard testing procedure. Compared to Al6061 matrix alloy, artificially peak aged composites show 100-140% improvement in hardness due to harder reinforcements and precipitation of solute rich secondary phases during ageing treatment. Overall, an 80-100% increase in wear resistance observed during peak ageing of hybrid composites. Analysis of Al6061 matrix alloy wear out surface shows extensive grooving and ploughing of the surface with the matrix material smear at many spots. The presence of tribolayer in Al6061-SiC+B4C composites shows a smoother surface than the Al6061 matrix alloy, which results in an excellent lubrication effect during an improvement in wear resistance. The wear surface of base aluminium alloy doesn’t show the existence of iron in the tribolayer. The research work is significant in forming a thermally activated wear-resistant metallic tribolayer with good tribological properties.

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