NEW PROCESS FOR PROTECTING STEEL COMPONENT PARTS OPERATING ON CONDITIONS OF HYDROABRASIVE WEAR AND RADIATION EXPOSURE

Abstract

Based on the ESA method, in the consequence of the research, a new process for protecting the DE steel parts for nuclear power plants has been developed. It consists in the formation of composite coatings on the above part working surfaces. The above composite coatings have been obtained in the sequence: ESA (CESA) carburizing → ESA Al → ESA (90% of WC+10% 1М) [(90% of WC+10% 1M)] → MPM reinforced with tungsten carbide powder or zirconium nitride, or their mixture. The experimental investigations have stated that the specimens made of corrosion-resistant stainless steel of 12Х18Н10Т (12Kh18N10T) grade with coatings obtained in the sequence of CESA → ESA Al → ESA (90% of WC+10% 1М) [(90% of WC+10% 1M)] → MPM (80% of ZrN) were of the best resistance to hydro abrasive wear. The wear values, respectively, were by 96.7; 110.3, and 128% less than those of the specimens without coatings made of steel 45, steel 12Х18Н10Т (12Kh18N10T), and steel 06Х12Н3ДЛ (06Kh12N3DL)