Experimental and Statistical Analysis of the Nitrided Layer Behavior during a Wear Process

Abstract

This paper aimed to develop a statistical analysis and studies the behavior of the thermo-chemically nitrided superficial steel layer characteristics during a dry wear process. The purpose of this study was to prove the causal relation between some characteristics of the superficial layer subjected to a wear process through the correlations between the depth of the worn-out superficial layer (Uh) or the mass loss (Δm) and the applied loading task (Q), during and after three hours of the wear process, taking into account two sliding degrees (ξ). After an experimental program, the obtained values were used to determine a correlation between these variables through an empirical study, to establish a causal relationship between them, using a statistical method. These characteristics were promoted according to behavior of the nitrided layer during the process of wear. To achieve this purpose we used a statistical method. The results of this study allow the prediction of the worn-out layer depth and the mass loss as a function of the normal load value.

Study on the Influence of the Treatment in Magnetic Field on the Nitrided Layer in Plasma

“…Micro-hardness (Vickers) was measured on the treated surface layer obtained by thermo-chemical treatment regimes shown above. Were performed a minimum eight determinations for each case [6,9,13,14].…”

“…The outer diameter of the conducting rollers has 40 mm or 44 mm and the inner diameter of the rollers has 16 mm. The rollers width (b) has 10 mm [6,14]. It were determined the durability of the rollers and the surface structure evolution for different parameters of testing regimes.…”

“…The nitriding treatments have been made at 530 o C, a temperature higher than 450 o C. This phase was decomposed and disapeared from the superficial layer. The micro-hardness and the wear resistance of the steels increase because of this situation [14]. During the wear process it was made a study regarding the distribution of the phases Fe 3 N and Fe 4 N in the superficial layer depth during every hour of wear process.…”

Structural Changes in the Superficial Layers of a Non-conventional Treated Steel Subjected to a Wear Process

“…After each hour of wear tests the external diameter was measured and diffractometric aspects were studied. It were determined the wear resistance of the rollers through dry friction and the surface structure evolution for different parameters of testing regimes [3,10,11].…”

“…The tendency of breaking decreases. Magnetostriction determines local oscillations resulting local plastic deformations [4][5][6][7][8][9][10][11][12][13][14][15][16]. Magnetostriction determines a reduction of the quantity of the residual austenite obtaining a higher hardness of the material and good endurance characteristics [3].…”