Uralmashzavod, Yekaterinburg, Russia

A. V. Belonosov, Head of the Laboratory of Non-Destructive Testing Methods, Quality Directorate, e-mail: A.Belonosov@uralmash.ru

Ural Federal University named after the first President of Russia B. N. Yeltsin, Yekaterinburg, Russia
O. A. Chikova, Dr. Phys.-Math., Associate Prof., Prof., Dept. of Physics, Institute of Fundamental Education, e-mail: O.A.Chikova@urfu.ru
N. A. Zaytseva, Cand. Eng., Associate Prof., Dept. of Physics, Institute of Fundamental Education, e-mail: mail: n.a.zaitceva@urfu.ru

Quality control of working rolls of a cold rolling mill made of 8Kh3SMF steel is aimed at identifying defects of metallurgical origin; it is carried out using ultrasonic and metallographic methods. The article presents the results of a comparative study of the microstructure and crystalline structure of samples taken from working rolls of a reversible rolling mill made of 8Kh3SMF steel from defective and defect-free areas according to ultrasonic testing (UT) data before quenching. Defects are identified by UT as discontinuities with a reflectivity equivalent to a diameter of 5.0–7.5 mm. As a result of metallographic examination by means of scanning electron microscopy (EDS and EBSD analysis), non-metallic inclusions of ~5-30 μm in size of four types were detected: MnS; (MnS + Al₂O₃ + CaO); (MnS + V + Ti) and (MnS + Ti). The metal selected from the defective area of the roll barrel contained non-metallic inclusions (MnS + V + Ti) and (MnS + Ti), which indicates non-recovery of titanium and vanadium alloying additives. The metal selected from the defective area of the roll barrel also had larger grain, fewer LAGB, greater material texture and heterogeneity of elastic properties. Consequently, the presence of defects that are identified by ultrasonic testing as discontinuities with a reflectivity equivalent to a diameter of 5.0–7.5 mm contributes to the occurrence of internal cracks in the metal during hardening and is not acceptable when concluding on compliance with quality requirements.
The research was conducted at the Laboratory of non-destructive testing methods (LNMK) of Uralmashzavod and the Center for Collective Use “Modern Nanotechnologies” of the Institute of Natural Sciences and Mathematics of the Ural Federal University.
The work was carried out using the equipment of the Center for Collective Use “Modern Nanotechnologies” of the Institute of Natural Sciences and Mathematics of the Ural Federal University.

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