Investigation of Screw Failed During Installation

Abstract:

Material used for screw production was investigated due to its inconvenient properties which caused the screw breaking on threads or in the head during the installation. Chemical composition of analyzed material corresponded with standard STN 17153 according to technological drawing for specific product. The metallographic analysis showed that failure of screws happened due to improper microstructure resulting from unsuitable thermal treatment of material. Fine inclusions based on aluminum nitride (AlN) and chromium carbonitride (Cr(C,N)) were segregated along the ferritic grain boundaries. Coarse aluminum nitride inclusions (AlN) in ferritic matrix affected the character of present fracture surface characterized by cleavage facettes. The fracture was propagated step by step following the planes with the increased concentration of inclusions across the whole cross-section of the screw.

• Periodical: Defect and Diffusion Forum (Volume 405)
• Pages: 229-233
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.405.229
• Online since: November 2020
• Authors: Mária Demčáková*, Alicia Mašlejová, Lucia Hrabčáková, Pavol Zubko, Slavka Hockicková, Peter Vranec, Peter Kalmár, Atila Drotár, Peter Prislupčák
• Keywords: Aluminum Nitrides, Brittle Fracture, Chromium Carbonitrides, EDS Analysis, Scanning Electron Microscopy, Screw

References

[1] A. Puškár, M. Hazlinger, Porušovanie a lomy súčastí, Žilina, EDIS ŽU, 2000. [in Slovak].

[2] ASM Handbook, Failure Analysis and Prevention, Volume 11, Materials Park, OH 44073-0002, American Society for Metals, (2002).

[3] J. Grutková, J. Kurian, Fyzikálna metalurgia a medzné stavy materiálu, Alfa, Bratislava, 1985. [in Slovak].

[4] I. Hrivňák, Fraktografia, In scriptum, Bratislava, 2009. [in Slovak].

[5] S. Gündüz, M.A. Erden, H. Karabulut, M. Türkmen, Effect of the addition of niobium and aluminium on the microstructures and mechanical properties of micro-alloyed PM steels, Materials and Technology 50 (2016) 641-648.

DOI: 10.17222/mit.2015.248

[6] G. Jeanmaire, M. Dehmas, A. Redjaïmia, S. Puech, G. Fribourg, Precipitation of aluminium nitride in a high strength maraging steel with low nitrogen content, Materials Characterization 98 (2014) 193-201.

DOI: 10.1016/j.matchar.2014.11.001

[7] J. Maciejewski, C. Regulski, A case of aluminium nitride embrittlement of heavy wall cast steel, Journal of Failure Analysis and Prevention 17 (2017) 1099-1104.

DOI: 10.1007/s11668-017-0360-x

[8] M. Tada, K. Kojima, M. Masayasu, Influence of nitrogen content on hot ductility of Nb- and B-added ultra-low carbon steel for welded cans, JFE Technical Report 23 (2018) 5-10.

[9] STN EN ISO 6507-1. Kovové materiály. Vickersova skúška tvrdosti. Časť 1: Skúšobná metóda (ISO 6507-1: 2018) [in Slovak].

[10] ASTM E 1086-14. Standard Test Method for Analysis of Austenitic Stainless Steel by Spark Atomic Emission Spectrometry.

DOI: 10.1520/e1086-14