Changes in the Surface Layer of Rolled Bearing Steel

Zemcik, Oskar; Sedlák, Josef; Chladil, Josef

doi:10.14311/ap.2015.55.0347

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…The most significant disadvantage of compound layer creation is their connectivity with changing dimensions of components. Due to changing dimensions, many parts must be finely ground to achieve the initial dimension accuracy [19,20].…”

Section: Resultsmentioning

confidence: 99%

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Pokorny¹,

Dobrocký²,

Kadlec³

et al. 2018

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The chemical composition of the steel is one of the primary characteristics that influence the mechanical properties of high-stressed machine parts such as barrels of small arms weapon. Heat treatment is the most important technology to reach requested mechanical properties. By a suitable combination of mechanical and tribological properties, it is possible to improve the surface of highly stressed parts as to improve the wear resistance of barrel surface. Thus, surface technology is next step for obtaining new properties as tribological properties or preferable mechanical properties. Due to obtain suitable microstructure and wear resistance the samples of C35, 34Cr4, 37Cr4 and 42CrMo4 were heat-treated with following chemical heat treatment by gas nitriding process, for 6 hours. This paper deals with the influence of alloying elements of structural steels on surface microhardness and depth of diffusion layer. The gas nitriding process caused the creation of a compound layer on the surface of the steel. This layer leads to significant improvement in wear resistance. The concentration of alloying elements was analysed by OES methods. The technology of nitriding was applied to annealed, tempered and quenched steels. After chemical heat treatment, new surface morphology was created. The surface layers of the samples were analysed by microhardness method; surface morphology was evaluated by SEM method. Experimental part concerns structural steels with a concentration of alloying elements to 1 wt.%. In experimental part, the influence of alloying elements on the diffusion process in Fe-C system and the microhardness of the surface was proved.K e y w o r d s : gas nitriding, microhardness, chemical composition, diffusion, barrel

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Section: Resultsmentioning

confidence: 99%

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Pokorny¹,

Dobrocký²,

Kadlec³

et al. 2018

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“…(a) Rolling [4,5], these studies report the mechanical property and microstructure of cold rolled low and high carbon steel and its work-hardening behavior during the deformation process;…”

Section: Influence Of the Main Technological Variables Of Cyclical Mementioning

confidence: 99%

Influence of the Main Technological Variables of Cyclical Mechanic-Thermal Processing on the Strain Hardening of Steel Parts

Brindis¹,

Bissesar²,

Wahid³

et al. 2016

JMEA

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Abstract:The main objective of the present work was to determine the influence of the most important technological variables of CMTP (cyclical mechanic-thermal processing) on the strain hardening in the surface layers of steel parts. For this, it was designed a full factorial plan at two levels of five independent variables that include the whole processing in two and three cycles, the cold-forming degree and force during the plastic deformation (burnishing), and the temperature and time at the given temperature during the aging. Each cycle is composed of plastic deformation at room temperature plus aging. As dependent variables, the degree and penetration depth of strain hardening were evaluated. Based on the appropriately used set of experimental data, it had been fitted an exponential model for each dependent variables and also a two-degree polynomial fitting of in-depth evolution of microhardness profile was obtained. The amount of cycles and the cold-forming degree are the technological variables of CMTP that influence the most on strain hardening, although other variables also are significant. The microhardness profile highlights that during the CMTP, the strain hardening decreases from the outer bound to the transition zone of the surface layers, where it disappears.

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“…Gharbi et al [33] showed the effect of the ballburnishing force on residual stress on the surface of AISI 1010. Zemčík et al [34] measured the same on EN 10132-4 specimens. Abdulstaar et al [35] showed the fatigue improvement on Al6082 for both shot peening and ball-burnishing with compressive residual stresses up to 0.5 mm below the surface but without describing the directionality of residual stresses and the method used to measure them.…”

Section: Introductionmentioning

confidence: 99%

Ball-burnishing effect on deep residual stress on AISI 1038 and AA2017-T4

García-Granada

Gómez-Gras

Jerez-Mesa

et al. 2017

Materials and Manufacturing Processes

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Ball-burnishing induces compressive residual stresses on treated materials by the effect of plastic deformation. The result is an increase in the fatigue life of the treated part, retarding the initiation of cracks on the surface. Compressive residual stresses have been previously measured by X-ray diffraction near the surface, revealing considerably high values at the maximum analyzed depth, in relation to other finishing processes such as shot peening. However, the maximum analyzed depth is very limited by using this technique. In this paper, the incremental hole drilling (IHD) technique is tested to measure residual stresses, being able to reach a 2-mm measuring depth. To that objective, a commercial strain gage is used and calibrated using finite element model simulations. A second Finite Element Model based on material removal rate is developed to obtain the equations to calculate the strain release through IHD. Finally, residual stresses are measured experimentally with that technique on two different materials, confirming that ball-burnishing increases the compressive residual stresses in layers up to 0.5¿mm deep for the testing conditions, which is a good response to industrial needs. The method proves to be suitable, simple and inexpensive way to measure the value of these tensions.Preprin

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Changes in the Surface Layer of Rolled Bearing Steel

Cited by 4 publications

References 8 publications

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Influence of the Main Technological Variables of Cyclical Mechanic-Thermal Processing on the Strain Hardening of Steel Parts

Ball-burnishing effect on deep residual stress on AISI 1038 and AA2017-T4

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