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L. A. Dobrzański, W. Borek and J. Mazurkiewicz

References [1] O. Kwon, K. Lee, G. Kim, K. Chin, Mater Sci Forum. 638-642, 136-141 (2010). [2] W. Bleck, P. Larour, A. Baumer, Mater Forum 29, 21-28 (2005). [3] International Iron & Steel Institute Committee on Automotive Applications: Advanced High Strength Steel (AHSS ) application guidelines, 2005, 69-74, www.ulsab.com (2012). [4] C. Scott, S. Allain, M. Faral, N. Guelton, Rev Metall. 103, (6), 293-302 (2006). [5] G. Frommeyer, U. Brüx, P. Neumann, ISI J Int. 43, 438-446 (2003

Open access

D. Hauserova, J. Dlouhy and J. Kotous

Abstract

Material research of the spring steels tries to meet requirements of the industry, which are mainly higher yield and tensile strength. Steel 51CrV4 is widely used for spring production. Optimization of its properties lies in tensile and yield strength enhancement without decrease in ductility in quenched and tempered state. This can be accomplished by structural refinement. One possible way to refine final quenched and tempered structure is refinement of the soft annealed structure before quenching. The article is devoted to accelerated carbide spheroidisation and refinement (ASR) and subsequent hardening of the 51CrV4 spring steel. Samples with different carbide size were prepared by conventional soft annealing in atmosphere furnace and ASR process by induction heating. Influence of the structural refinement on the properties of quenched and tempered state was studied.

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Magdalena Dlapka, Christian Gierl-Mayer, Raquel de Oro Calderon, Herbert Danninger, Sven Bengtsson and Eva Dudrova

Abstract

Nitrogen is usually regarded as an inert sintering atmosphere for PM steels; however, this cannot be taken for granted in particular for steels alloyed with nitride forming elements. Among those elements, chromium has become more and more important as an alloying element in sintered low alloy structural steels in the last decade due to the moderate alloying cost and the excellent mechanical properties obtainable, in particular when sinter hardening is applied. The high affinity of Cr to oxygen and the possible ways to overcome related problems have been the subject of numerous studies, while the fact that chromium is also a fairly strong nitride forming element has largely been neglected at least for low alloy steel grades, although frequently used materials like steels from Cr and Cr-Mo prealloyed powders are commonly sintered in atmospheres consisting mainly of nitrogen.

In the present study, nitrogen pickup during sintering at different temperatures and for varying times has been studied for Cr-Mo prealloyed steel grades as well as for unalloyed carbon steel. Also the effect of the cooling rate and its influence on the properties, of the microstructure and the composition have been investigated. It showed that the main nitrogen uptake occurs not during isothermal sintering but rather during cooling. It could be demonstrated that a critical temperature range exists within which the investigated CrM-based steel is particularly sensitive to nitrogen pickup.

Open access

K. Rzeszut and Ł. Polus

References 1. Design Manuals, “Steel Buildings in Europe, Single-Storey Steel Buildings, Part 7, Fire engineering”, Arcelor Mittal, 2008. 2. DIFISEK, “Dissemination of Fire Safety Engineering Knowledge”, Poznan University of Technology, 2008. 3. Eurocode 3, EN 1993-1-1, Design of steel structures, Part 1-1 General rules and rules for buildings, European Committee for Standardization, 2005. 4. Eurocode 3, EN 1993-1-2, Design of steel structures, Part 1-2 Structural fire design. European Committee

Open access

W. Sitek and A. Irla

Abstract

The goal of the research carried out was to develop the fuzzy systems, allowing the determination of the Jominy hardenability curve based on the chemical composition of structural steels for quenching and tempering. Fuzzy system was created to calculate hardness of the steel, based on the alloying elements concentrations, and to forecast the hardenability curves. This was done based on information from the PN-EN 10083-3: 2008. Examples of hardenability curves calculated for exemplar steels were presented. Results of the research confirmed that fuzzy systems are a useful tool in evaluation the effect of alloying elements on the properties of materials compared to conventional methods. It has been demonstrated the practical usefulness of the developed models which allows forecasting the steels’ Jominy hardenability curve.

Open access

M. Kwiecień, P. Graca, K. Muszka and J. Majta

. Muszka, Ł. Madej, J. Majta, Mater. Sci Eng. A 574 , 68-74 (2013). [13] C. Nagasaki, M. Kaga, K. Shibata, K. Asakura, M. Hatano, ISIJ International 42 , 57-S6, (2002). [14] M. Wielgus, J. Majta, J. Łuksza, P. Paćko, Steel Res. Int. 81 , 490-493 (2010). [15] K. Muszka, P.D. Hodgson, J. Majta, J. Mater. Process. Technol. 177 (1), 456-460 (2006). [16] K. Muszka, P. Graca, T. Simm, E. Palmiere, Key Eng. Mater. 622-623 , 1023-1030 (2014). [17] J. Majta, K. Muszka, L. Madej, M. Kwiecien, P. Graca, Manufact. Sci. Techn. 3 (4), 134

Open access

Jana Simeg Veternikova, Martin Fides, Jarmila Degmova, Stanislav Sojak, Martin Petriska and Vladimir Slugen

R eferences [1] M. A. Pouchon, J. Chen, M. Dobeli and W. Hoffelner, “Oxide dispersion strengthened steel irradiation with helium ions”, J. Nucl. Matter. , 352 (2006) 5761. [2] K. Yutani, H. Kishimoto, R. Kasada and A. Kimura, “Evaluation of Helium effects on swelling behavior of oxide dispersion strengthened ferritic steels under ion irradiation”, J. Nucl. Matter. , 367370 (2007) 423427. [3] M. B. Toloczko, F. A. Garner and S. A. Maloy, “Irradiation creep and density changes observed MA 957 pressurized tubes irradiated to doses of 40110 dpa at

Open access

J. Stoulil, Y.R. Carreno, L. Pavlova, M. Kouřil and D. Dobrev

LITERATURA 1. Prošek, T., et al., Influence of heat flux and surface temperature on the intergranular corrosion of stainless steel. Materials and Corrosion 2005, 56 (5), 312-317. 2. Prošek, T.; Novák, P., Initiation and propagation of stainless steel pitting corrosion under heat flux. Materials and Corrosion 2003, 54 (12), 933-939. 3. Stoulil, J.; Bystriansky, J., Influence of heat flux on localised corrosion of stainless steel under boiling conditions. Materials and Corrosion 2011, 62 (8), 760-765. 4. Dobrev, D., et al

Open access

P. Maruschak, R. Bishchak, O. Maruschak, D. Draganovská and A. Pylypenko

REFERENCES 1. Kryzhanivs’kyi E. I., Nykyforchyn H. M. Specific features of hydrogen-induced corrosion degradation of steels of gas and oil pipelines and oil storage reservoirs, Mat. Sci., 2011 , 47(2), 127-136. 2. Bolzon G., Zvirko O. An indentation based investigation on the characteristics of artificially aged pipeline steels, Proc. Struct. Integr. , 2017 , 3, 172-175. 3. Nykyforchyn H. M., Zvirko O. I., Tsyrulnyk O. T. Hydrogen assisted macrodelamination in gas lateral pipe, Proc. Struct. Integr., 2016 , 2, 501-508. 4

Open access

Eugeniusz Mańka, Małgorzata Słomion and Maciej Matuszewski

sliding parameters, Advances in Mechanical Engineering , 8(12), 1-14. 6. Guo Y.B., Zhang D.K., Yang X.H., Feng C.N., Ge S.R. (2017), Experimental research on effect of wire rope transverse vibration on friction transmission stability in a friction hoisting system, Tribology International , 115, 233-245. 7. Hansel J. (ed.) (2000), Steel-rubber balances ropes SAG. Scientific and Technical Papers KTL – AGH Kraków, 19, 1-125 (in Polish). 8. Kwaśniewski J. (2010), Magnetic steel ropes tests. AGH Publishers, Kraków (in Polish). 9. Li S.L., Hu