The development of technology for thin-layer laser modification of chromium-nickel steel 12Kh18N10T

Abstract

Background. The article describes the processing technology and the results of studying the morphology, elemental composition, X-ray phase analysis and microhardness of the surface of stainless steel samples subjected to preliminary air-abrasive treatment and subsequent laser pulse alloying in a two-component coating layer consisting of graphite paste and titanium dioxide (anatase) powder. The purpose of this work is to identify the most rational modes of laser pulsed alloying of stainless steel 12Cr18Ni10Ti with an alloying coating preapplied to the treated surface. Materials and methods. The prototypes were plates made of stainless chromium-nickel steel 12Cr18Ni10Ti. Experimental studies were carried out using an abrasive blasting apparatus, an ultrasonic bath, an automated installation for thermophysical coherent surface modification “LRS-50A”. Results. A mechanism for increasing the microhardness of the surface of prototypes made of stainless chromium-nickel steel has been established and experimentally confirmed, which consists in the diffusion of alloying elements of the coating, saturation of the surface layer of steel with them during reflow under laser exposure, which in turn leads to the formation of new phases. Conclusions. A technology has been developed for thin-layer modification of the surface of stainless chromium-nickel steel by laser pulsed alloying using a special coating. The results of the work can be used with high efficiency at engineering enterprises that develop and produce critical parts and mechanisms that operate under conditions of intense gas and hydroabrasive wear.

Keywords

• stainless steel
• laser alloying
• morphology
• elemental composition
• x-ray phase analysis
• microhardness