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Abstract

The paper presents the results of research on GX120Mn13 modification performed with the SiZr38 inoculant. The microstructure of Hadfield cast steel in as-cast condition was studied through optical microscopy before and after inoculant introduction into the liquid steel. After heat treatment, mechanical properties and wear resistance tests were conducted to analyse the influence of the inoculant. The wear rate was determined according to the Standard Test Method for Determination of Slurry Abrasivity (ASTM G-75). The results show that average grain diameter, area of eqiuaxed grains crystallization and secondary dendrite arm spacing were lower after inoculation. After inoculation, the ultimate tensile strength and proof strength were higher by 8% and 4% respectively, in comparison to the initial state. The results of abrasion wear tests show that the introduction of 0.02 wt. % of zirconium significantly improved wear resistance, which was 34% better in comparison to steel without zirconium.
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Bibliography

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Authors and Affiliations

S. Sobula
1
ORCID: ORCID
S. Kraiński
2

  1. AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland
  2. PGO S.A. Pioma Odlewnia, Oddział w Piotrkowie Trybunalskim, ul. Romana Dmowskiego 38, 97-300 Piotrków Trybunalski, Poland
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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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Bibliography

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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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