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Selected Tribological Properties of A390.0 Alloy

Archives of Foundry Engineering | 2017 | vol. 17 | No 4 | DOI: 10.1515/afe-2017-0153

Keywords Tribology Coefficient of friction A390.0 alloy

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Abstract

Emergence of new designs for internal combustion engines resulted in a necessity to search for new materials which will rise to excessive technological requirements under operating conditions of modern internal combustion engines of up to 150 kW. Focusing only on material properties, theoretically existing alloys should meet presents requirements. More importantly, existing materials are well fitted to the entire crank-piston system. Thus, there is a need for a more thorough examination of these materials. The paper presents studies on determination of coefficient of friction μ and wear for the A390.0 alloy modified with AlTi5B master alloy combined with EN GJL-350 cast iron. The characteristics of a T-11 tribological tester (pin on disc) used for the tests, as well as the methodology of the tribological tests, were described. Also, the analysis of the surface distribution of elements for the pin and the disc was presented. The studies were realized in order to find whether the analyzed alloy meets the excessive requirements for the materials intended for pistons of modern internal combustion engines. The results show that the A390.0 alloy can only be applied to a load of 1.4 MPa. Above this value was observed destructive wear, which results in the inability to use it in modern internal combustion engines.

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Authors and Affiliations

R. Wieszała

J. Piątkowski

Coefficient of Friction of a Brake Disc-Brake Pad Friction Couple

M. Mróz A.W. Orłowicz G. Wnuk O. Markowska W. Homik B. Kolbusz

Archives of Foundry Engineering | 2016 | No 4 | DOI: 10.1515/afe-2016-0109

Keywords Flake graphite cast iron Brake discs Abrasive wear resistance Coefficient of friction

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Abstract

The paper concerns evaluation of the coefficient of friction characterising a friction couple comprising a commercial brake disc cast of

flake graphite grey iron and a typical brake pad for passenger motor car. For the applied interaction conditions, the brake pressure of

0.53 MPa and the linear velocity measured on the pad-disc trace axis equalling 15 km/h, evolution of the friction coefficient μ values were

observed. It turned out that after a period of 50 minutes, temperature reached the value 270°C and got stabilised. After this time interval,

the friction coefficient value also got stabilised on the level of μ = 0.38. In case of a block in its original state, stabilisation of the friction

coefficient value occurred after a stage in the course of which a continuous growth of its value was observed up to the level μ = 0.41 and

then a decrease to the value μ = 0.38. It can be assumed that occurrence of this stage was an effect of an initial running-in of the friction

couple. In consecutive abrasion tests on the same friction couple, the friction coefficient value stabilisation occurred after the stage of

a steady increase of its value. It can be stated that the stage corresponded to a secondary running-in of the friction couple. The observed

stages lasted for similar periods of time and ended with reaching the stabile level of temperature of the disc-pad contact surface.

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Authors and Affiliations

M. Mróz

A.W. Orłowicz

G. Wnuk

O. Markowska

W. Homik

B. Kolbusz

Dry Sliding Friction and Wear Behaviour of Leaded Tin bronze for Bearing and Bushing Application

D. Dinesh A. Megalingam

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1095-1104 | DOI: 10.24425/amm.2021.136429

Keywords Wear coefficient of friction Microstructure leaded tin bronze grey relational analysis

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Abstract

Among different bearing materials, copper-based alloys are the most important source for bearing and bushing applications. In this work, the tribological behavior of a leaded tin bronze (Cu-22Pb-4Sn) against an EN31 Steel for various loads (20 N, 70 N, 120 N) and different sliding velocity (1 m/s, 3 m/s, 5 m/s) at 3000 m sliding distance is performed using a pin on disk tribometer. Irrespective of all loads and sliding velocity, a higher specific wear rate is observed at 1 m/s and 120 N that fails to facilitate the formation of lubricating film, whereas a lower specific wear rate is evident when the sliding velocity is increased to 5 m/s. This is attributed to the formation of a stable oxide layer that has been confirmed through the Energy dispersive X-ray spectroscopy analysis and Scanning electron microscopy. The coefficient of friction is observed in reducing trend from 0.69 to 0.48 for the increasing load (70 N, 120 N) and sliding velocity (3 m/s and 5 m/s) due to stable thin oxide film formation. Also, the increase in frictional force and loading the interacting surface temperature is increased to a maximum of 102°C. The Grey relational analysis indicates that the optimal parameters for the minimum specific wear rate and coefficient of friction is 120 N and 5 m/s that has been confirmed with experimental analysis.

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Authors and Affiliations

D. Dinesh

1

e-mail:

ORCID:

A. Megalingam

1

e-mail:

ORCID:

Bannari Amman Institute of Technology, Department of Mechanical Engineering, Sathyamangalam, Erode-638401, Tamil Nadu, India

Effect of Cryogenic Treatment on Wear Resistance and Microstructure of 42CrMo Steel

Haidong Zhang Xianguo Yan Zhi Chen Minna Zhao Liang Tang Yuan Gao Fan Li Yao Huang Junji Li

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 1 | 127-135 | DOI: 10.24425/amm.2022.137481

Keywords cryogenic treatment orthogonal design method hardness coefficient of friction wear resistance microstructure

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Abstract

In this work, thermo-mechanically treated 42CrMo steel was subjected to cryogenic treatment conducted by means of orthogonal design method, followed by low-temperature tempering to investigate the effect of different parameters of cryogenic treatment on wear resistance of 42CrMo steel and to optimize parameters of cryogenic treatment for improving wear resistance. The results of hardness test and wear test show that cryogenic treatment significantly improves wear resistance with marginal changes in coefficient of friction and hardness. Specifically, cryogenic temperature has the largest impact on wear resistance of 42CrMo steel, holding time has medium impact, and the parameter of treatment cycles has the least impact. The optimum parameters of cryogenic treatment are −196°C for 12 hours with one cycle for improving wear resistance. The results of scanning electron microscopy (SEM) and X-ray diffractometry (XRD) analysis indicate that marginal changes in hardness and coefficient of friction may be owing to little amount of transformation of retained austenite, and the significant influence of cryogenic treatment on improving wear resistance of 42CrMo steel can be mainly attributed to segregation of carbon atoms promoted by cryogenic treatment resulting in more precipitation of carbides in subsequent tempering.

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Authors and Affiliations

Haidong Zhang

1

e-mail:

ORCID:

Xianguo Yan

1

e-mail:

ORCID:

Zhi Chen

1

e-mail:

ORCID:

Minna Zhao

1

e-mail:

ORCID:

Liang Tang

1

e-mail:

ORCID:

Yuan Gao

1

e-mail:

ORCID:

Fan Li

1

e-mail:

ORCID:

Yao Huang

1

e-mail:

ORCID:

Junji Li

2

e-mail:

ORCID:

Taiyuan University of Science and Technology, School of Mechanical Engineering , Taiyuan 030024, China
Taiyuan University of Science and Technology, Jincheng School District, Jincheng 048011, China

Examination of the Force Parameters in Drawing Process of CuZn39Pb3 Cast Rod using Selected Lubricants

Michał Jabłoński

Archives of Foundry Engineering | 2023 | vol. 23 | No 4 | 99-104 | DOI: 10.24425/afe.2023.146684

Keywords Plastic working mechanical properties Lubricant coefficient of friction CuZn39Pb3 cast rod

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Abstract

The paper presents the results of research on the wire drawing process of wire brass using different deformation degree and using selected lubricants of different viscosity. The material used for the study was CuZn39Pb3 wire, which was obtained under laboratory horizontal continuous casting process using graphite crystallizer. A cast brass rod with a diameter of 9.4 mm was drawn in laboratory conditions to a diameter of 3 mm and then drawn in one operation to a diameter of 2.9 mm, 2.65 mm or 2.4 mm. Before the final deformation process, the wire surfaces were properly prepared. Based on the results obtained, the drawing tension was used to draw conclusions. The oxide surface has been shown to increase drawing tension and decrease quality of wires, while the surface that has been etched prior to deformation has a beneficial effect both on the reduction of the strength parameters of the drawing process as well as on the improvement of its quality. In addition, it has been shown that despite the emulsion has lowest dynamic viscosity that’s protect wire surface well, decrease the drawing force at high unit loads.

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Authors and Affiliations

Michał Jabłoński

1

e-mail:

ORCID:

AGH University of Krakow, Faculty of Non-Ferrous Metals, al. A. Mickiewicza 30, 30-059 Kraków, Poland

Comprehensive analysis of tribological factor influence on stress-strain and thermal state of workpiece during titanium alloys machining

Vadym Stupnytskyy Xianning She

Archive of Mechanical Engineering | 2021 | vol. 68 | No 2 | 227-248 | DOI: 10.24425/ame.2021.137049

Keywords titanium alloy cutting coefficient of friction stress-strain state thermal state simulation of cutting tool wear

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Abstract

The article describes how different friction coefficients under certain cutting conditions and parameters affect the formation of the stress-strain and thermal states of the product when titanium alloy machining. A new research methodology is used for the study. Firstly, in the initial data for simulation, each time a different declared coefficient of friction is proposed, and every such task of the cutting process modelling is solved for various cutting parameters. The second stage analyzes how these coefficients influence the stress-strain and thermodynamic state of the workpiece and tool during cutting, as well as the tool wear dynamics. In the third stage of the study, ways for ensuring these analytically-grounded tribological cutting conditions are proposed. The analysis of different wear criteria in the simulation models of titanium alloys cutting is carried out. Experimental studies confirm simulation results.

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Vadym Stupnytskyy

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Xianning She

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Lviv Polytechnic National University, Lviv, Ukraine

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