SPA Obukhov Plant, St. Petersburg, Russia
A. A. Teregulova, Metallurgical Engineer of the 1st Category, e-mail: ter.adelya@gmail.com
S. A. Peskishev, cand. Eng., Head of the Metallography Laboratory, e-mail: sap@tosno.ru

Empress Catherine II St. Petersburg Mining University, St. Petersburg, Russia
S. A. Vologzhanina, Dr. Eng., Associate Prof., Prof., Dept. of Materials Science and Art Products Technology, e-mail: vologzhanina_SA@pers.spmi.ru

This paper examines a laboratory testing system designed to identify and analyze the causes of defects in M16–M24 bolt samples made of 40Kh steel grade, delivered to the Central Plant Laboratory (CPL) of a machine-building enterprise within the defense industry. An algorithm for conducting metallographic, mechanical, and corrosion testing is presented, with consideration given to the possibility of integrating data into an expert system based on the mivar approach in the KESMI RAZUMATOR WiMi software package. The proposed tool is characterized by its flexible structure and the ability to be expanded by adding new diagnostic features, including defect morphology and their behavior during operation. The software forms the basis for creating a laboratory database for presenting, processing, and analyzing test data on various steel grades, defects, and other known parameters, with the goal of automating logical decision-making by laboratory specialists in real time. The study aims to improve the system for assessing the quality of product materials based on laboratory testing. An analysis using the developed algorithm revealed that structural components do not significantly influence defect formation. A series of mechanical and chemical tests confirmed the material’s compliance with regulatory requirements. Hardness testing confirmed compliance with specified characteristics and revealed the presence of a gradient along the tooth profile. An additional corrosion test for pitting resistance in an iron trichloride solution revealed pitting in areas of increased microhardness and defects.

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