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Changes in the Microstructure and Abrasion Resistance of Tool Cast Steel after the Formation of Titanium Carbides in the Alloy Matrix

Grzegorz Tęcza
Archives of Foundry Engineering | 2023 | vol. 23 | No 4 | 173-180 | DOI: 10.24425/afe.2023.148961
Keywords Cast tool steel Microstructure Titanium carbides Heat treatment Hardness Resistance to abrasive wear
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Abstract

Cast martensitic alloy steel is used for the production of parts and components of machines operating under conditions of abrasive wear. One of the most popular grades is cast steel GX70CrMnSiNiMo2 steel, which is used in many industries, but primarily in the mining and material processing sectors for rings and balls operating in the grinding sets of coal mills. To improve the abrasion resistance of cast alloy tool steel, primary titanium carbides were produced in the metallurgical process by increasing the carbon content to 1.78 wt.% and adding 5.00 wt.% of titanium to test castings. After alloy solidification, the result was the formation of a microstructure consisting of a martensitic matrix with areas of residual austenite and primary titanium carbides evenly distributed in this matrix.
The measured as-cast hardness of the samples was 660HV and it increased to as much as 800HV after heat treatment.
The abrasion resistance of the sample hardened in a 15% polymer solution increased at least three times compared to the reference sample after quenching and tempering.
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Bibliography

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Authors and Affiliations

Grzegorz Tęcza
1
ORCID: ORCID
  1. AGH University of Krakow, Poland

Numerical Calculations of WR-40 Boiler Based on its Zero-Dimensional Model

Bartłomiej Hernik
Chemical and Process Engineering | 2014 | No 2 June | 173-180 | DOI: 10.2478/cpe-2014-0013
Keywords CFD modelling boilers combustion grate
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Abstract

Generally, the temperature of flue gases at the furnace outlet is not measured. Therefore, a special computation procedure is needed to determine it. This paper presents a method for coordination of the numerical model of a pulverised fuel boiler furnace chamber with the measuring data in a situation when CFD calculations are made in regard to the furnace only. This paper recommends the use of the classical 0-dimensional balance model of a boiler, based on the use of measuring data. The average temperature of flue gases at the furnace outlet tk" obtained using the model may be considered as highly reliable. The numerical model has to show the same value of tk" . This paper presents calculations for WR-40 boiler. The CFD model was matched to the 0-dimensional tk" value by means of a selection of the furnace wall emissivity. As a result of CFD modelling, the flue gas temperature and the concentration of CO, CO2, O2 and NOx were obtained at the furnace chamber outlet. The results of numerical modelling of boiler combustion based on volumetric reactions and using the Finite-Rate/Eddy-Dissipation Model are presented.

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Authors and Affiliations

Bartłomiej Hernik

An unpublished Musical by Pirandello: a polysemic and multicultural kaleidoscope

Lia Fava Guzzetta
Kwartalnik Neofilologiczny | 2019 | No 2 | 173-180 | DOI: 10.24425/kn.2019.128389
Keywords Pirandello Torre Gherson Theater Musical Broadway
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Abstract

An unpublished Musical by Pirandello: a polysemic and multicultural kaleidoscope – The fact that Pirandello conceived the idea of writing a Musical was well know, but the recent discovery of the actual text and the musical score, in the archive of Guido Torre Gherson, agent of the writer while he lived in Paris, has shed some light on his final years and writings. The findings are discussed in the context of his late theatrical and fictional works, such as I giganti della montagna.

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Authors and Affiliations

Lia Fava Guzzetta

Politics of History through the Eyes of Historians

Jakub Muchowski
Historyka Studia Metodologiczne | 2009 | vol. 39 | 173–180
Keywords politics of history historiography theory of history
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Abstract

This article discusses recently published conference papers Memory and Politics of History. Expeciemed by Poland and her Neighbors.
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Authors and Affiliations

Jakub Muchowski
ORCID: ORCID

The Carolingian coin of Louis the Pious found in Truso

Mateusz Bogucki
Wiadomości Numizmatyczne | 2006 | Rok L | Zeszyt 2 (182) | 173-180
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Authors and Affiliations

Mateusz Bogucki

Wacław Szybalski (1921–2020)

Ewa Łojkowska
Nauka | 2021 | No 1 | 173-180 | DOI: 10.24425/nauka.2021.136313
Keywords Wacław Szybalski Polish scientist and philanthropist Lwów Gdańsk Madison
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Abstract

Wacław Tadeusz Szybalski (1921–2020) was born in the city of Lwów. Gradueted from School of Chemistry of Technical University of Lwów (Politechnika Lwowska). In 1945 he obtained diploma of chemical engineering from Silesian University of Technology in Gliwice and PhD in 1949 from Gdańsk University of Technology. He left Poland in 1949, first for Denmark and later USA. From 1951–1955 Wacław Szybalski joined the famous Cold Spring Harbor Laboratory, NY, as a Staff Member. From 1960 to 2003 he has position of Professor of Oncology at the McArdle Laboratory for Cancer Research of the University of Wisconsin-Madison, USA. Prof. Wacław Szybalski published over 260 scientific papers, covering many areas of biology, including bacterial genetics, mechanisms of drug resistance and radiosensitization, mutagenesis, multi-drug therapy, molecular biology of bacteriophages, particularly phage lambda, genetic engineering, gene therapy, synthetic biology and DNA biochemistry/sequencing. Prof. Wacław Szybalski retired in 2003, and held the rank of Emeritus Professor of Oncology and of Genetics since then. During all years in USA Wacław Szybalski relations with Poland, especially Gdańsk remained very strong. He was a Mentor of several Polish postdocs. Prof. Wacław Szybalski received many science awards over the years, was a Foreign Member of the Polish Academy of Sciences and Polish Academy of Art and Sciences. In 2011, he received the highest honor awarded in Poland, becoming a Knight of the Order of Polonia Restituta, First Class, presented by President of Poland Bronisław Komorowski. He has also received five honorary doctorates from leading universities in Poland.
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Authors and Affiliations

Ewa Łojkowska
1 2
  1. Międzyuczelniany Wydział Biotechnologii Uniwersytetu Gdańskiego i GUMed
  2. Fundacja Profesora Wacława Szybalskiego

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