Оценка триботехнических характеристик стали 40Х после закалки деформирующим резанием

Оценка триботехнических характеристик стали 40Х…

Инженерный журнал: наука и инновации

# 11·2017 15

Evaluation of the tribological characteristics of steel 40X

after deformational cutting hardening

, A.G. Degtyareva

, N.N. Zoubkov

V.V. Poptsov

, V.N. Simonov

Bauman Moscow State Technical University, Moscow, 105005, Russia

SecoTools, Moscow, 123242, Russia

The article considers a possibility of increasing wear resistance of machine parts by

means of deformational cutting surface hardening as an alternative to the existing hard-

ening technologies. Surface hardening by deformational cutting is carried out using sole-

ly standard metal cutting machines excluding additional equipment and separate harden-

ing operation. The technology is less labour-intensive and more economical than tradi-

tional ones. The article describes an original technique for accelerated comparative

tribological tests on the friction machine AmslerA135 to confirm the improved surface

wear resistance after application of deformational cutting hardening. This study shows

the results of research aimed to compare the surfaces of steel 40X samples after deforma-

tional cutting hardening, bulk hardening and without hardening as well. The article re-

ports on the measured microhardness and gives an analysis of the microstructure of mi-

cro-sections surface layer of tested samples longitudinal sections. The findings of this

investigation demonstrate that the deformational cutting hardening allows to create a

hardened surface layer of high hardness with a special macro-geometry, which is more

labour-intensive in comparison with those obtained after bulk hardening.

Keywords:

deformational cutting, surface hardening, hardness, wear resistance, heat treat-

ment, hardening, tribological tests

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