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Abstract

The article presents the results of metallographic and tribological tests on GX120MnCr13 cast steel that was previously subjected to heat treatment (including solution treatment from 1100°C and isothermal holding at 250, 400, and 600°C for 100 hours). The temperatures of the isothermal holding process were selected in order to reflect the possible working conditions of the cast elements that can be made of this cast steel. Wear tests were carried out under dry friction conditions using the ball-on-disc method using a ZrO2 ball as a counter-sample. The tests were carried out with a load of 5 N. The influence of the long-term isothermal holding process on the microstructure of the tested cast steel was analysed by light and scanning microscopy; however, abrasion marks were also examined using a confocal microscope. Based on the tests conducted, it was found that in the microstructures of the sample after solution treatment and samples that were held in isothermal condition at 250 and 400°C, the grain boundary areas were enriched in Mn and Cr compared to the areas inside the grains. Pearlite appeared in the sample that was heated (or held in isothermal holding) at 600°C; its share reached 41.6%. The presence of pearlite in the austenitic matrix increased the hardness to 351.4 HV 10. The hardness of the remaining tested samples was within a range of 221.8–229.1 HV 10. Increasing the hardness of the tested cast steel directly resulted in a reduction in the degree of wear as well as the volume, area, and width of the abrasion marks. A microscopic analysis of the wear marks showed that the dominant process of the abrasive wear of the tested friction pair was the detachment and displacement of the tested material through the indentation as a result of the cyclical impact of the counter-sample.
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Authors and Affiliations

Barbara Kalandyk
1
ORCID: ORCID
Renata E. Zapała
1
ORCID: ORCID
Iwona Sulima
2
ORCID: ORCID
Piotr Furmańczyk
3
ORCID: ORCID
Justyna Kasińska
3
ORCID: ORCID

  1. AGH University of Krakow, Faculty of Foundry Engineering, al. A. Mickiewicza 30, 30-059 Krakow, Poland
  2. University of the National Education Commission Krakow, Institute of Technology, ul. Podchorążych 2, 32-084 Krakow, Poland
  3. Kielce University of Technology, Faculty of Mechatronics and Mechanical Engineering, Poland
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Abstract

Refinement is one of the most energy consuming technological process, aimed at obtaining mineral raw materials of the proper grain size.

Cast structural elements such as jaws or hammers in crushing machines operate under conditions of an intensive wear. The data indicate

that 80 % of failures of machines and devices is caused by wearing of rubbing surfaces. This problem became the subject of several

scientific and industrial investigations carried out in the whole world in order to produce materials ultra- wear resistant. Methods allowing

to obtain wear resistant composite castings are discussed in the hereby paper. Within the performed research microstructures of the

produced composite zones were presented and the comparative analysis with regard to mechanical and functional properties of local

composite reinforcements in relation to the commercial alloys of increased wear resistance was performed. The results show almost twenty

five times increase in wear resistance compared to manganese cast steel containing 18 % Mn.

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Authors and Affiliations

E. Olejnik
T. Tokarski
B. Grabowska
Ł. Szymański
P. Kurtyka
W. Maziarz
P. Czapla
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Abstract

In order to increase wear resistance cast steel casting the TiC-Fe-Cr type composite zones were fabricated. These zones were obtained by

means of in situ synthesis of substrates of the reaction TiC with a moderator of a chemical composition of white cast iron with nickel of

the Ni-Hard type 4. The synthesis was carried out directly in the mould cavity. The moderator was applied to control the reactive

infiltration occurring during the TiC synthesis. The microstructure of composite zones was investigated by electron scanning microscopy,

using the backscattered electron mode. The structure of composite zones was verified by the X-ray diffraction method. The hardness of

composite zones, cast steel base alloy and the reference samples such as white chromium cast iron with 14 % Cr and 20 % Cr, manganese

cast steel 18 % Mn was measured by Vickers test. The wear resistance of the composite zone and the reference samples examined by ballon-disc

wear test. Dimensionally stable composite zones were obtained containing submicron sizes TiC particles uniformly distributed in

the matrix. The macro and microstructure of the composite zone ensured three times hardness increase in comparison to the cast steel base

alloy and one and a half times increase in comparison to the white chromium cast iron 20 % Cr. Finally ball-on-disc wear rate of the

composite zone was five times lower than chromium white cast iron containing 20 % Cr.

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Authors and Affiliations

E. Olejnik
T. Tokarski
B. Grabowska
Ł. Szymański
P. Kurtyka
P. Czapla

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