Comparative Studies on the Wear of ADI Alloy Cast Irons as Well as Selected Steels and Surface-Hardened Alloy Cast Steels in the Presence of Abrasive

AbstractThe paper presents the results of wear tests obtained for 4 groups of materials: surface-hardened alloy steels and alloy cast steels for structural applications, hard-wearing surface-hardened alloy cast steels, and austempered alloy cast irons. The wear tests have been performed on a specially designed test rig that allows reproducing the real operating conditions of chain wheels, including the rolling and sliding form of contact between elements. The chain wheels subjected to tests were operated with the use of loose quartz abrasive. This study presents results of measurements of material parameters, micro-structure of a surface subject to wear, as well as the linear wear determined for the materials considered. Based on the results, the following was found: the best wear properties were obtained for surface-hardened alloy steels and wear surface; strengthening of the ADI surface took place - most probably as a result of transformation of austenite into martensite; the uniformity of the structure of the materials affects the surface wear process. The study also indicated a significant degree of graphite deformation in ADI characterized by the upper ausferritic structure and its oblique orientation in relation to the surface, which resulted in a facilitated degradation of the surface caused by the quartz abrasive.

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Experimental Studies on Abrasive Wear of Surface-Hardened and Shot Peened Alloy Cast Steels

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.674.201 ◽

2016 ◽

Vol 674 ◽

pp. 201-206

Author(s):

Andrzej Norbert Wieczorek

Keyword(s):

Abrasive Wear ◽

Cast Steel ◽

Experimental Studies ◽

Operating Conditions ◽

Linear Wear ◽

Plastic Properties ◽

Cast Steels ◽

Wear Tests ◽

Alloy Cast

The paper presents the results of wear tests of shot-peened and non-shot-peened cast steels with the use of an especially designed test rig simulating real operating conditions of chain wheels. The chain wheels subjected to tests were operated with the use of loose quartz abrasive. The studies involved the determination of strength and plastic properties, hardness distributions, microstructure and linear wear of the selected cast steels. Based on the results obtained, the following was found: the abrasive wear of cast steel chain wheels increased after shot peening.

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The Role of Operational Factors in Shaping of Wear Properties of Alloyed Austempered Ductile Iron Part II. an Assessment of the Cumulative Effect of Abrasives Processes and the Dynamic Activity on the Wear Property of Ausferritic Ductile Iron/ Rola Czynników Eksploatacyjnych W Kształtowaniu Właściwości Zużyciowych Stopowych Żeliw Sferoidalnych Ausferrytycznych Część II. Ocena Skumulowanego Działania Scierniwa I Wymuszeń Dynamicznych Na Właściwości Zużyciowe Sferoidalnych Żeliw Ausferrytycznych

Archives of Metallurgy and Materials ◽

10.2478/amm-2014-0282 ◽

2014 ◽

Vol 59 (4) ◽

pp. 1663-1671

Author(s):

A.N. Wieczorek

Keyword(s):

Ductile Iron ◽

Impact Resistance ◽

Operating Conditions ◽

Linear Wear ◽

Wear Property ◽

Wear Properties ◽

Cast Irons ◽

Combined Action ◽

Austempering Temperature ◽

The Impact

Abstract The study presents results of the second part of wear tests of austempered ductile irons on a specially designed test rig that allows simulating the real operating conditions of chain wheels. The chain wheels subjected to testing were operated in conditions characterized by combined action of loose quartz abrasive and an external dynamic force. The studies involved the determination of the hardness, microstructure and linear wear of the ADIs in question considered as a function of the austempering temperature and the austenite content. Based on the results obtained, the following was observed: a decrease in the wear as a function of the austempering temperature and thus in the content of austenite in ADIs; a slight deformation of graphite after completing the wear test involving external dynamic forces; a negative linear dependence between the linear wear and the impact resistance. It was found that the increased wear of cast irons with a lower content of austenite may be caused by the propagation of cracks initiated by damage to graphite nodules, while in the conditions characterized by combined action of abrasive wear and dynamic load the cast irons with a higher content of austenite and higher impact resistance have better wear properties.

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EXPERIMENTAL STUDIES ON THE INFLUENCE OF ABRASIVE MATERIALS ON THE WEAR OF HARD-WEARING STEELS

Tribologia ◽

10.5604/01.3001.0012.7665 ◽

2018 ◽

Vol 281 (5) ◽

pp. 133-141 ◽

Cited By ~ 1

Author(s):

Andrzej N. WIECZOREK

Keyword(s):

Experimental Studies ◽

Structural Steels ◽

Operating Conditions ◽

Ring Test ◽

Test Rig ◽

Wear Properties ◽

Aggressive Action ◽

Low Wear ◽

Loss Of Mass ◽

Wear Tests

The paper presents the wear properties of hard-wearing steels and structural steels used in mining and transport machines exposed to the aggressive action of the environment, which have been determined experimentally in the presence of diverse abrasive materials. The wear tests were carried out on a ring-on-ring test rig simulating the operating conditions of elements exposed to abrasive wear. The samples were subjected to tests in conditions of sliding contact, and the main destructive process was micro-cutting of the surface with loose corundum or quartz grain. In the case of the coal abrasive, only slight grinding in of the mating surfaces was observed. The loss of mass in the samples was measured as the parameter characterizing the wear. It was then used to determine the volume loss. Based on the results obtained, it was found that the wear resistance of hard-wearing steels was approximately four times higher as compared to S355J2 structural steel for the corundum and quartz abrasives. In the case of the coal abrasive, there was a relatively low wear for all of the materials examined.

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The Role of Operational Factors in Shaping of Wear Properties of Alloyed Austempered Ductile Iron Part I. Experimental Studies Abrasive Wear of Austempered Ductile Iron (Adi) in the Presence of Loose Quartz Abrasive/ Rola Czynników Eksploatacyjnych W Kształtowaniu Właściwości Zużyciowych Stopowych Żeliw Sferoidalnych Ausferrytycznych Część I. Eksperymentalne Badania Zużycia Sciernego W Obecności Lużnego Scierniwa Kwarcowego Żeliw Adi

Archives of Metallurgy and Materials ◽

10.2478/amm-2014-0281 ◽

2014 ◽

Vol 59 (4) ◽

pp. 1653-1662 ◽

Cited By ~ 2

Author(s):

A.N. Wieczorek

Keyword(s):

Phase Transition ◽

Ductile Iron ◽

Experimental Studies ◽

Industrial Applications ◽

Operating Conditions ◽

Austempered Ductile Iron ◽

Linear Wear ◽

Wear Properties ◽

Plastic Properties ◽

Austempering Temperature

Abstract The paper presents the results of the wear tests of alloyed austempered ductile iron performed on a specially designed test rig simulating real operating conditions for chain wheels which were selected for testing due to their complex rolling and sliding form of contact between elements. The chain wheels subjected to tests were operated with the use of loose quartz abrasive and without it. The studies involved the determination of strength and plastic properties, hardness distributions, microstructure and linear wear of the ADI in question considered as a function of the austempering temperature. Based on the results obtained, the following was found: phase transition of austempered ductile iron can take place for combinations typical of industrial applications, a non-linear increase in the wear as a function of the austempering temperature occurs, an increase in the hardness of all the analysed types of ADI takes place during the operation without the presence of abrasive, the phase transition of austenite into martensite in ADI with a lower content of austenite requires higher loads as compared with cast iron containing 40% of austenite.

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Operation-Oriented Studies on Wear Properties of Surface-Hardened Alloy Cast Steels Used in Mining in the Conditions of the Combined Action of Dynamic Forces and an Abrasive Material

Archives of Metallurgy and Materials ◽

10.1515/amm-2017-0351 ◽

2017 ◽

Vol 62 (4) ◽

pp. 2381-2389 ◽

Cited By ~ 3

Author(s):

A.N. Wieczorek

Keyword(s):

Abrasive Wear ◽

Shot Peening ◽

Cast Steel ◽

Operating Conditions ◽

Dynamic Force ◽

Cast Steels ◽

Dynamic Forces ◽

Combined Action ◽

The Impact ◽

Wear Tests

Abstract This paper presents the results of wear tests of shot-peened and not shot-peened cast steels used in the mining machinery industry, in particular in the construction of chain drums for armoured face conveyors. Wear tests were carried out in the conditions corresponding to the real operating conditions of armoured face conveyors during drifting work in rocks such as sandstone. The operating factors subjected to the analyses included the presence of quartz abrasive and the impact of external dynamic forces. On the basis of the wear tests as well as the microhardness and microstructure examinations performed, it has been found that the action of an additional dynamic force has a synergistic impact on the process of abrasive wear in loose quartz abrasive. It has been further found that the value of abrasive wear of chain wheels operated in the conditions of a combined action of abrasive and a dynamic force depends on whether the area of mating of wheels with the chain was shot-peened or not before the wear tests – an increase in the abrasive wear was observed for the wheels made of cast steel subjected to shot peening in the area of mating with the chain. Lower resistance to abrasive wear of the cast steels subjected to shot peening before the wear tests could result from the formation of cracks in the surface layer caused by the action of shot.

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