Metallographic Examination of Fracture Splitting 44SMn28 Steel Used in the Manufacture of Rotor Shaft

Abstract:

In this work a failed rotor shaft of φ 7.2 mm diameter manufactured from constructional steel 44SMn28 (1.0762) was examined. Fracture splitting into 2 pieces in the threaded part of the shaft in a direction parallel to the longitudinal axis occurred. The failure was induced by mechanical forces in the threading process. The failed shaft was examined on a metallographic and scanning microscope. It was found that the failure was caused by excessive accumulation of MnS inclusions in an unfavourable banded formation.

• Periodical: Materials Science Forum (Volume 782)
• Pages: 231-234
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.782.231
• Online since: April 2014
• Authors: Zbigniew Jurasz*, Ryszard Kochel, Krzysztof Adamaszek
• Keywords: Constructional Steel, Fracture, MnS Inclusions

References

[1] L.A. Dobrzański, Fundamentals of Materials and Metal Science, WNT, Gliwice-Warszawa, 2002, p.571, (in Polish).

[2] Metals Handbook, Ninth Edition, Vol. 11, Failure Analysis and Prevention, ASM, Metals Park Ohio, 2002, Chapter: Scanning Electron Microscopy.

[3] DIN 50602 standard, 1985. Inclusion Rating in Steels, Method K.