Nikolay Nikolaevich Sergeev, Doctor of Technical Sciences, Professor of Tula State Lev Tolstoy Pedagogical University - bright representative of the scientific school of physical fundamental and applied materials science M. A. Krishtal
The most important scientific problem solved under the guidance of Professor Krishtal M. A. was the problem of corrosion-mechanical destruction of high-strength reinforcing iron alloys. Much effort has been expended to solve this scientific problem of great applied importance. Complex regularities were established and the physical nature and mechanisms of hydrogen embrittlement and destruction of reinforcing high-strength steels used in composite reinforced concrete structures and structures in the form of fibrous steel reinforcing fillers were revealed. In the Tula region in solving this problem a significant contribution was made by a student of Mikhail Aronovich Krishtal Professor Nikolay Nikolaevich Sergeev, who defended his PhD and doctoral dissertations under his leadership.