Abstract
A technique is presented for hardening metal products, in particular, the main tools (hammers) and cases of core drilling bits made of steel 30HGSA, using thermomechanical surface treatment according to a separate scheme. The method of combined laser thermomechanical hardening used in the study consists in the use of shot peening followed by laser heat treatment. Its use makes it possible to increase the operational properties of steel products, in particular, their wear and corrosion resistance. Based on the results of theoretical and experimental studies, the paper substantiates the features of dynamic surface plastic deformation for the analysis of impact during shot peening. The advantages of using laser hardening without surface melting are presented. Experimental research methods are proposed for determining the structural-phase composition, structure of the surface layer, hardness and microhardness of the hardened zones of steel 30HGSA. The range of rational modes of impact shot peening and thermal laser treatment has been determined. A device for testing samples for wear resistance has been developed. Methods of testing for wear and corrosion resistance of the surface of samples are proposed for assessing the tribological properties and contact interaction of materials under quasi-static and dynamic loading conditions. It is concluded that rational technological modes of hardening tools made of steel 30HGSA using combined laser thermomechanical treatment allow increasing the depth of the hardened layer by ~1.5 times compared to laser heat treatment. In addition, they provide the microhardness of the surface layer of ~5400 MPa, which is ~2.5 times higher than the microhardness of the base material
Highlights
With the current high level of technological requirements for industrial products, special attention is paid, above all, to their reliability and durability
The results of the study made it possible to determine rational technological modes of combined thermomechanical processing of tools made of steel 30HGSA, in particular:
The study of the structure of the surface layer of the cut, hardened by the combined method of laser thermomechanical hardening, using X-ray diffraction analysis showed the high efficiency of this type of treatment in comparison with others
Summary
With the current high level of technological requirements for industrial products, special attention is paid, above all, to their reliability and durability. The use of combined technologies for hardening steel parts allows to increase the service life, because they most often work under shock and alternating loads. These are products made of structural steels, including steel 30HGSA, such as: aircraft parts (aircraft pylon sheathing), impact tools (crusher hammers), core drill bit bodies, axles and shafts (including camshafts), compressor blades. The development of combined methods of hardening, which increase the operational properties of products and at the same time have an economic advantage, is an urgent task that requires detailed study
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call