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«Abstract Agricultural soil-processing machines are subject to an extensive abrasive wear. This paper analyses technical materials and their fitness ...»

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Votava : Usage Of Abrasion-Resistant Materials In Agriculture Hardness of steel Creusabro 4800 was 2.7 times higher than hardness of the etalon, this bainite-martensite structure had harness of 460 HV.

Austenite steel Creusabro M showed only 1.6 times higher hardness than the base etalon. The resistance to abrasive wear was 4 times higher comparing to the steel

12 050. Measured values Microhardness values of the structure were around 160 HV. This material shows significant hardening when abrasive elements attack.

The last tested material was steel Setudor 204. This material is formed by carbide particles which are put in a metal matrix. Macrohardness of this material was 5.2 times higher than the etalon; however, the abrasive-resistance was 16.2 times better than by the etalon. Hardness of the extracted carbides in the base microstructure reached 1 376 HV.

Materials were tested on abrasive cloth in compliance with the norm ČSN 01 5084.

Based on the results of this test, there is defined an abrasive-resistance under static conditions. Before applying the results to the technical operations, there should be processed also tests of dynamic characteristics. Low impact resistance lowers the applicability of the materials.

Conclusions Soil-processing machines are irreplaceable in agriculture. Abrasive wear and abrasive wear accompanied by force stresses have the biggest negative influence on degradation of these machines. It is thus necessary to use such material which has a good abrasive resistance and a good ductility as during the soil cultivation the soil processing machine parts are subjected to extensive strains. Abrasive wear is also influenced by soil characteristics (its chemical composition, moisture and cementation).

One of the possibilities to eliminate negative abrasive wear is to select an appropriate material for the soil processing parts: manganese austenite steel (Creusabro M) is cold formed and reaches a good hardening of the given part. Hardness is increased when the metastabile austenite is being transferred on martensite during the process of plastic deformation. The steel performs a good wear resistance at extensive surface stress which occurs mainly in ploughing. However, this steel is not magnetic and a possible loss of working part may cause problems to some crop machines, which have security mechanisms (cutting mechanisms of forage harvesters) based on the principle of magnetic characteristics of common steels.

References Bednář, R., Votava, J., Fajman, M., Červinka, J. (2013) Suitability of technical materials for machinery subsoilers for soil tillage. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 61(1), 1–8.

Blaškovič, P., Balla J., Dzimko M. (1990) Tribology. Bratislava: Alfa (in Slovak).

Čičo, P., Kotus, M., Tóth, R., Daňko, M. (2011a) Odolnosť šípovej radličky po preventívnom návare v prevádzke. In Kvalita a spoľahlivosť technických systémov. Nitra: SPU, pp. 97–100.

Votava : Usage Of Abrasion-Resistant Materials In Agriculture Čičo, P., Kotus, M., Kalincová, D. (2011b) Odolnosť dlátových radličiek v podmienkach abrazívneho opotrebenia. Acta facultatis technicae, Zvolen, 16(2), 25–30.

Čičo, P., Kalincová, D., Kotus, M. (2011c) Influence of the welding method on microstructural creation of welded joints. Research in Agricultural Engineering (RAE), 50–56.

ČSN 01 5084 (1974) Determination of metal material resistance against wear by abrasiva cloth.

ČSN EN 23878 (1995) Hardmetals. Vickers hardness tests (ISO 3878:1983).

ČSN EN ISO 6507-1 (1996) Metallic materials: Vickers hardness test – Part 1: Test method.

Daňko, M., Čičo, P., Kotus, M., Pauliček, T. (2011) Odolnosť materiálov vytvorených laserovým naváraním proti abrazívnemu opotrebeniu. In Kvalita a spoľahlivosť technických systémov. Nitra: SPU, pp.101–105.

Dushyant, S., Saha, K. P., Mondal, D. P. (2010) Development of mathematical model for prediction of abrasive wear behaviour in agricultural grade medium carbon steel. Indian Journal of Engineering and Materials Sciences, 18(2), 12 –136.

Kotus, M., Čičo, P., Daňko, M., Andrássyová, Z., Vysočanská, M. (2011a) Zvyšovanie oteruvzdornosti pôduspracujúcich nástrojov použitím tvrdonávaru. Acta technologica agriculturae, 14(1), 20–23.

Kotus, M., Andrássyová, Z., Čičo, P., Fries, J., Hrabě, P. (2011b) Analysis of wear resistent weld materials in laboratory conditions (Special). Research in Agricultural Engineering (RAE), 74–78.

Lechner, F.G., McColly, H.F. (1959) Abrasive-Wear Resistance of Hard-Facing

Materials Used on Agricultural Tillage Tools. St. Joseph: ASABE. DOI:

10.13031/2013.41167.

Pošta, J., Dvořák, M., Veselý, P. (2002) Degradace strojních součástí. Praha: Česká zemědělská univerzita, Technická fakulta.

Stodola, J., Pešlová, F., Krmela, J. (2008) Opotřebení strojních součástí. Brno:

Univerzita obrany.

Suchánek, J., Kuklík, V., Zdravecká, E. (2007) Abrazivní opotřebení materiálu.

Praha: ČVUT.

Votava, J., Černý, M., Filípek, J. (2007). Abrazivní opotřebení plužních čepelí z ADI litiny. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 55(1), 173–182.

Votava, J. (2012) Abrazivní opotřebení ocelových materiálů v kvasném průmyslu.

Kvasný průmysl, 58(9), 264–268.

Vysočanská, M., Čičo, P. (2012) Analýza opotrebenia a renovácia krájadla rastlinných zvyškov v prevádzkových podmienkach. In Kvalita a spol'ahlivosť technických systémov. Nitra: SPU Nitra, pp. 176–180.



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