JSC Railway Research Institute
JSC Railway Research Institute
Nikulin S.A.,National University of Science and Technology "MISIS" |
Shitkin S.L.,JSC Railway Research Institute |
Rozhnov A.B.,National University of Science and Technology "MISIS" |
Rogachev S.O.,National University of Science and Technology "MISIS" |
Nechaikina T.A.,National University of Science and Technology "MISIS"
Izvestiya Vysshikh Uchebnykh Zavedenij. Chernaya Metallurgiya | Year: 2017
The method of determining the surface stress by X-ray method (by an example of steel samples of critical parts of railway transport) was examined taking into account the special surface preparation at the point of measurement. The features of the measurement surface stress by X-ray method were considered; the applicability of the designed layout of the portable X-ray diffractometer was shown. The diffractometer operates as follows. Changing the angle of diffraction in the presence of mechanical stresses leads to a shift of the diffraction peak on the recorded diffraction spectrum according to the peak position in the absence of stresses. The detector records the diffracted X-rays and passes the discrete information about the distribution of radiation intensity (which is captured by the detector) to the personal computer using an analog-digital converter. A special program “STRESSCONT-ROL” was developed for computer processing of the recorded diffraction spectra. The program allows to display graphically the diffraction spectra recorded by the detector, to control of diffractometer operation and to calculate the stresses using databases on metals and phases. Computer processing of the diffraction profiles is used to identify the position of the gravity center. The algorithm of the program involves the separation of the background, approximation of the data array to a curve and exact definition of the gravity center of the smoothed profile. The surface stresses on the fragment of the solebar of 20GL-type steel (after normalization and volume-surface hardening), cut from the box opening area with R55-radius, were measured. The surface stresses definitions for normalized fragment showed the results close to zero and the results of surface stresses definitions for the fragment with a volume-surface hardening showed a significant compressive stresses. Thus, the shape of the diffraction peak and the level of surface stress are directly related to the investigated steel microstructure features. In this case, the X-ray method of determining the surface tension may be an indicator of the surface state. © 2017, National University of Science and Technology MISIS. All rights reserved.
Mironov A.E.,JSC Railway Research Institute |
Gershman I.S.,JSC Railway Research Institute |
Gershman E.I.,JSC Railway Research Institute |
Zheleznov M.M.,JSC Railway Research Institute
Journal of Friction and Wear | Year: 2017
New complex alloying has been designed for aluminum antifriction alloys. Their tribological behavior has been determined, including the running-in ability, scoring resistance, and wear resistance. The interconnection of the tribological properties of experimental alloys with a doping level by different elements has been analyzed. Recommendations on the optimum content of alloying elements for the antifrictionality of the aluminum based alloys have been given. © 2017, Allerton Press, Inc.
Zakharov S.M.,JSC Railway Research Institute |
Goryacheva I.G.,Russian Academy of Sciences |
Krasnov A.P.,Russian Academy of Sciences |
Yudin A.S.,Russian Academy of Sciences |
And 4 more authors.
Journal of Friction and Wear | Year: 2015
In this work, friction modifiers in a wheel–rail system and their operation mechanism are considered. Three stages of a complex tribological study and tribological tests are applied within the development of friction modifiers and estimation of their tribological properties. The first stage (Institute of Element and Organic Compounds, Russian Academy of Sciences) is to elaborate hydroalcoholic soluble compounds and polymeric binders, as well as of methods of applying them to steel surfaces, and to study their tribological characteristics using an I-47 friction machine. The second stage (Institute of Mechanics Problems, Russian Academy of Sciences) is devoted to probing of tribological characteristics and durability of the elaborated composites on a tribometer, which allows to implement a cylinder–plate contact interaction under full slip conditions. The third stage (JSC “Railway Research Institute”) is aimed at studying the tribological parameters of the developed modifier composites at rolling-sliding conditions under real contact pressure of 1200 MPa. © 2015, Allerton Press, Inc.