Актуальные проблемы в машиностроении. 2016. №3

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Актуальные проблемы в машиностроении. 2016. №3 Материаловедение
в машиностроении
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INFLUENCE OF PRELIMINARY HEAT TREATMENT OF STRUCTURAL STEEL
ON THE STRENGTHENING AT LASER-PLASMA PROCESSING
Bagaev S.N. 1, Academician, Director ILP SB RAS, e-mail:
Grachev G.N. 1, Head of the Laboratory, e-mail:
Smirnov A.L. 1, Chief Designer, e-mail:
Khomyakov M.N. 1, Junior Researcher, e-mail:
Tokarev A.O. 2, . (Engineering), Associate Professor, e-mail:
Bataeva Z.B. 2, Ph.D. (Engineering), Associate Professor, e-mail:
Gerber A.J. 2, Ph.D. student, e-mail:
1 Institute of Laser Physics of the SB RAS, 13/3 Akademika Lavrent'eva Prospekt, Novosibirsk,
600090, Russian Federation
2 Siberian State University of Water Transport, 33 Shhetinkina st., Novosibirsk, 630099, Russian
Federation
Abstract
The presented results reflect the experiment on the impact of laser-plasma action on the structure
and microhardness of the structural steel surface which includes various structure patterns, such as
the ferrite-pearlite structure, the secondary sorbite and the martensitic structure. The polyfunctional
CO2-laser oscillator - amplifier system was used as a means of technology equipment. As a material
for study, the sheet structural low-alloyed steel 40ХН ГОСТ 4543-71 was selected in the different
stages: as original steel and as the steel in the state of post-thermal treatment with the help of low
and high secondary hardening. The obtained data show that laser-plasma treatment LPT allows to
perform hardening of structural steel surface which achieves high (9,0 - 11,0 GPa) solidity reaching
the depth of about 0,2 mm. It is possible to use the laser-plasma treatment as a method for local
surface hardening in the manufacturing process or during the repairs of machine parts and tools at
such different levels as a standard or annealed steel surface treatment which follows into
mechanization treatment and also into full thermal treatment with various kinds of release for
different degrees of solidity which is determined by the functioning of the treated parts.
Keywords
Laser plasma, structural steel, surface hardening, stages of technological process.