Effect of the hardened layer thickness on the size and distribution of residual stresses in cast iron components

1989 ◽  
Vol 31 (1) ◽  
pp. 56-59
Author(s):  
F. I. Yakovlev
Keyword(s):  
Cast Iron ◽  
Residual Stresses ◽  
Layer Thickness ◽  
Hardened Layer ◽  
Hardened Layer Thickness

INVESTIGATION OF HARDENED LAYER THICKNESS ON COATINGS MADE BY EVAPORATION METHODS

2020 ◽  
pp. 38-42
Author(s):  
YU. A. KUZNETSOV ◽  
◽  
I. N. KRAVCHENKO ◽  
T. A. CHEKHA ◽  
D. T. ABDUMUMINOVA ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Hardened Layer ◽  
Hardened Layer Thickness

Theoretical and Technological Basics of the Friction Units’ Resource Increasing

2020 ◽  
Vol 303 ◽  
pp. 15-23
Author(s):  
V.E. Ovsyannikov ◽  
R.Yu. Nekrasov ◽  
M.V. Deneko ◽  
U.S. Putilova ◽  
D.P. Il’yaschenko
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
New Technology ◽  
Hardened Layer ◽  
Technology Application ◽  
Friction Units ◽  
Technical And Economic Analysis ◽  
Traditional Technologies ◽  
Hardened Layer Thickness ◽  
Production Conditions

The study considers the theoretical and technological aspects of the friction units’ resource increasing made of ferritic-pearlitic gray cast iron. It is found that chemical and thermal treatment has the best combination of criteria by the integrated technical and economic analysis for the cast iron parts’ hardening methods. The methods of the cast iron hardening used in practice are not applicable in the real production conditions. It happens because of the technological processes’ complexity and the equipment. Alternatively, the hardened layer thickness does not exceed 0.3 mm. The study considers the main aspects of the new technology application for the surface hardening, The recommendations for its application are formulated. They depend on the intended service of the part. The technical level of the offered solutions is estimated in comparison with traditional technologies of cast iron hardening.

Effect of the hardened layer thickness of the formation of mesostructures during extension of surface hardened samples

1998 ◽  
Vol 41 (6) ◽  
pp. 564-568 ◽  
Author(s):  
V. E. Panin ◽  
A. I. Slosman ◽  
N. A. Kolesova ◽  
I. Yu. Molchunova ◽  
B. B. Ovechkin
Keyword(s):  
Layer Thickness ◽  
Hardened Layer ◽  
Hardened Layer Thickness

Influence of Diffusional Surface Alloying on the Hardened-Layer Thickness for Gray-Iron Machine Parts

2018 ◽  
Vol 38 (11) ◽  
pp. 901-903 ◽  
Author(s):  
V. I. Vasil’ev ◽  
V. E. Ovsyannikov ◽  
R. Yu. Nekrasov ◽  
Yu. A. Tempel’
Keyword(s):  
Layer Thickness ◽  
Hardened Layer ◽  
Gray Iron ◽  
Surface Alloying ◽  
Machine Parts ◽  
Hardened Layer Thickness ◽  
Diffusional Surface

scholarly journals The effect of surface plastic hardening technology, residual stresses and boundary conditions on the buckling of a beam

2020 ◽  
pp. 87-98
Author(s):  
V P Radchenko ◽  
O S Afanaseva ◽  
V E Glebov
Keyword(s):  
Residual Stresses ◽  
Boundary Conditions ◽  
Hardened Layer ◽  
Surface Plastic ◽  
Straight Line ◽  
Calculated Profile ◽  
Inhomogeneous Temperature ◽  
Inhomogeneous Temperature Field ◽  
Plastic Hardening ◽  
Initial Strains

The complex influence of the surface plastic hardening technology, residual stresses, and boundary conditions on the bending of a hardened beam of EP742 alloy was performed. A phenomenological method of restoring the fields of residual stress and plastic deformations performed by its experimental verification in the particular case of ultrasonic hardening is given. The correspondence of the calculated and experimental data for the residual stresses is observed. For assess the influence of the formed residual stresses on convex cylinders, the calculation methods are used for initial strains based on using analogies between the initial (residual) plastic strains and temperature strains in an inhomogeneous temperature field. This allowed us to reduce the consideration of the problem to the problem of thermoelasticity, which was further solved by numerical methods. The effect of four types of boundary conditions for fixing the ends of the beams (rigid fastening and articulation of the ends and ribs in various combinations, cantilever) on the shape and size of the bending of the beam 10×10×100 mm after ultrasonic hardening is studied in detail. It was found that the minimum deflection is observed with a hard seal of both ends of the beam. The effect of the thickness of the beam, which varied from 2 to 10 mm, on their buckling under the same distribution of residual stresses in the hardened layer was studied, and the nonlinear nature of the increase in the deflection boom with decreasing thickness for all types of boundary conditions was established. It is shown that under all boundary conditions, the curvature along the length of the beam practically does not change, therefore it can be considered constant. The consequence of this is the preservation of the hypothesis of flat sections after the hardening procedure, which is confirmed by the calculated profile of the beam section in plane symmetry, close to a straight line. The influence of the anisotropy of surface plastic hardening on the buckling of the beam was found to be significant, which can serve as the basis for choosing the optimal hardening procedure. The performed parametric analysis of the task is presented in the form of graphical and tabular information on the results of the calculations.

scholarly journals Selected Properties of the Surface Layer of C45 Steel Parts Subjected to Laser Cutting and Ball Burnishing

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3429 ◽  
Author(s):  
Agnieszka Skoczylas ◽  
Kazimierz Zaleski
Keyword(s):  
Surface Layer ◽  
Residual Stresses ◽  
Laser Cutting ◽  
Experimental Studies ◽  
Hardened Layer ◽  
Ball Burnishing ◽  
Absolute Value ◽  
The Impact ◽  
Compressive Residual Stresses

In this article, we report the results of experimental studies on the impact of ball burnishing parameters on the roughness, microstructure and microhardness of the surface layer of laser-cut C45 steel parts. We also analysed the distribution of residual stresses generated in the surface layer of these parts. Laser-cut parts often require finishing to improve the quality of their surface. The tests performed in this study were aimed at assessing whether ball burnishing could be used as a finishing operation for parts of this type. Ball burnishing tests were performed on an FV-580a vertical machining centre using a mechanically controlled burnishing tool. The following parameters were varied during the ball burnishing tests: burnishing force Fn, path interval fw and the diameter of the burnishing ball dn. Ball burnishing of laser-cut C45 steel parts reduced the surface roughness parameters Sa and Sz by up to 60% in relation to the values obtained after laser cutting. Finish machining also led to the reorganization of the geometric structure of the surface, resulting in an increase in the absolute value of skewness Ssk. This was accompanied by an increment in microhardness (maximum microhardness increment was ΔHV = 95 HV0.05, and the thickness of the hardened layer was gh = 40 µm) and formation of compressive residual stresses in the surface layer.

Sign in / Sign up

Export Citation Format

Share Document