Using Fractography for Determining of Technological Reasons of Defect and Brittle Fractures Occurrence in Steels

Abstract:

The paper describes practical examples of identification of rupture defect on steel components and its connection with the violating of the production process. Every violation of optimal production technology causes irreversible changes in the material that are visible on the fracture after breaking. Characteristics of the fracture allow the backward identification of specific technological reasons for defect fracture origin and consequent degradation of utility properties of the component. Documented examples include wide spectrum of production technologies where defective fractures can occur as are casting, forming, heat treatment or surface treatment. Wider notice is dedicated to the brittle fractures caused by non-optimal heat treatment. Presented fractures are documented by macroscopical as well as microscopical study using SEM microscope and they represent handy atlas of defects fractures with usage in real industrial practice.

• Periodical: Solid State Phenomena (Volume 270)
• Pages: 3-14
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.270.3
• Online since: November 2017
• Authors: Ján Bezecný*, Igor Barényi
• Keywords: Austenite Grains, Defective Fractures, SEM, Treatment of Steel

References

[1] I. Hrivňák, Fractography, STU MTF Trnava, (2009).

[2] J. Bezecný, Fractures in steel parts and they relation to production technology, VAAZ Brno – ZŤS Dubnica nad Váhom, (1988).

[3] V. Košelev, Fractures in steels, they origin and classification, Metalurgist, no. 11. (1960) p.425.

[4] J. Koutský, F. Jandoš, V. Karel, Fractures in steel parts, SNTL, Praha, (1976).

[5] P. Levíček, K. Stránský, Metallurgical defects of steel castings, SNTL, Praha, (1984).

[6] J. Šenberger, A. Záděra, J. Čech, Contribution to the conchoidal fracture creation after deoxidation Al, Zr, Ti and KVZ. In 49. Foundry days - proceedings. Brno. 2012. pp.62-71. ISBN 978-80-02-02405-7.

[7] J. Šenberger, A. Záděra, Z. Carbol, Influence of aluminium, nitrogen and young modulus of casting to conchoidal fracture Steelmakers, 2013, Karlova Studánka.

[8] R. Mišičko, S. Longauer, M. Longauerová, Interdendritic fracture at continuous casting of steels, Fractography, Tatranské Matliare, (1987).

[9] L. Šmrha, Solidification and crystallization of steel, SNTL, Praha, (1983).

[10] J. Bezecný, Fractographical aspects of the inspection of selected steel for special technology, Habilitation thesis, VA Brno, (1991).

[11] F. Jandoš, Cracks in segregations in forgings made by several steels, Engineering 39, 1989, 10, s. 608.

[12] J. Bezecný, Contribution to problematic of creation of inner, Acta Metallurgica Slovaca, Košice, 3 (1997).

[13] J. Bezecný, Creation of crack and fractures at heat treatment of, TnU AD, Trenčín, 2007, ISBN 978-80-8075-202-6.

[14] J. Bárta, Tempered Martensite Embrittlement of Ultrahigh-strength Steels, Fraktografia, 22nd International Conference on Heat Treatment, (2015).

[15] L. Engel, H. Klingele, Rasterelektronenmikroskopische Untersuchungen von Metallschäden, Carl Hanser Verlag, Műnchen – Wien, (1982).

[16] J. Bezecný, M. Kianicová, Causal analysis of failured collar, Fraktografia, (2009).

[17] J. Pietikeinen, Observations about tempered martensite embrittlement, Scandinavien journal of Metalurgy, 34, 2005, 1.

[18] P. Beťáková, L. Hyspecká, J. Sojka, Quantitative evaluation of hydrogen embrittlement on constructional steels Metal, Hradec nad Moravicí, (2002).

[19] J. Bezecný, J. Kučerová, Fractographical Method of Steel Embrittlement Identification by Galvanic Metallization, Machine Dynamics Problems. (2006) Vol. 30, No 3.

[20] J. Bezecný, J. Kučerová, I. Letko, M. Polanka, Reduced lifetime reason analysis of plate chain links, 5th Youth SymposiumYSESM, Púchov, (2006).