THE STRUCTURE AND CHARACTERISTICS OF THE OVELAP AREAS DURING THE LASER HARDENING OF STEELS AND IRONS


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Abstract

The article considers the issue of wear resistance improvement of working surfaces of the parts of machines, equipment and metal cutting tools. One of the most prospective directions in this field is the thermal treatment of wearing surfaces by means of the action of focused heat flows created by laser light. Modern fiber optic lasers are the most advanced from technology viewpoint. The research and estimation of the structure of the overlap areas during multi-pass laser operation are the key elements of preparing of technology process and influences directly the selection of treatment modes. The author gives the results of experimental research of the influence of fiber optic laser treatment parameters on the state of surface layer of the overlap areas during the multi-pass heat treatment of steels and irons. LKD4-015.150 fiber optic laser was used for experimental research. The treatment was performed in the continuous mode with the partial fusion of processed surface. The process mode was selected according to the data of the work “Modification of steel and iron surfaces using the fiber optic laser”. X12MF steel and SCh21 iron plates 15х15х3 mm in size were used as the samples. After treatment, end surface of each sample was burnished at minimal modes in order to eliminate the additional thermal influence on the structure; after that, microslices were produced on the surface. 4-% alcohol solution of hydrogen nitrate (HNO3) was used as an etchant. The hardness was measured using the Shimadzu HMV-2 microhardness tester. The samples’ structure was studied using the Zeiss AXIO Observer.D1m microscope and the Zeiss LEO1455VP electron scanning microscope.

During this research, the author carried out the analysis of the overlap areas structure and measured their microhardness. The article displays the computational scheme and calculation formula of engagement factor during the multi-pass processing.

About the authors

Pavel Aleksandrovich Ogin

Togliatti State University, Togliatti

Author for correspondence.
Email: fantom241288@yandex.ru

post-graduate student of the Department «Equipment and technology of machinery production»

Россия

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