Abrasive wear characteristics of 40Mn2 steel in simulated condition of sprocket wheel in crawler bulldozer walking system

Abstract

The abrasive wear characteristics of 40Mn2 steel be studied in this paper. The rubber wheel abrasive wear tester be used for simulating the sprocket wheel working-conditions. The relationship between worn surface residual stress and wear rate was studied. Wear surface morphology and mechanism worn surface micro-structures are also shown in results. In addition, there are XRD pattern of the experimental abrasives, to better reveal the abrasive wear mechanisms. The results indicates that the larger the applied load and sliding speed is, the greater the wear rate will be. The content of hard phase in abrasive determine the wear rate. The main wear mechanisms of soil and coal in workingconditions are scratching and spalling, respectively. Spalling, chipping, scratching and pitting are the main wear mechanisms in sand working-condition. There are same trend of the wear rate and the worn surface residual stress with the wear time increasing. Intergranular carbides can decrease the wear resistance to some extent.

Dry wear characteristics of machined ZL109 aluminum-silicon alloy surface under unidirectional and reciprocating rolling-contact friction

“…The maximum residual compressive stress on the wear surface of reciprocating friction is larger than that of unidirectional friction. It indicates the amount of plastic deformation of reciprocating friction is higher than that of unidirectional friction [29,32]. Therefore, there is larger wear loss for reciprocating friction compare with unidirectional friction, so resulting in serious wear.…”

“…In addition, From figures 17 and 18, there is residual compressive stress on the wear surface. And the maximum surface residual stress on unidirectional and reciprocating wear surface is less than the yield limit of ZL109 aluminum-silicon alloy [19,29]. Therefore, the stress when surface failure during friction is less than the yield limit of substrate.…”

“…The machined surface residual stress significantly affects the parts' fatigue life, which reflects the degree of surface plastic deformation and is closely related to wear rates [29]. Therefore, the residual stress tester (model: XRD-Combo) is used to measure the variation of the wear surface residual stress with wear time increasing, so as to study the relationship between mechanical properties and surface wear of ZL109 aluminum-silicon alloy.…”

Dynamic Contact Characteristics Analysis of Heavy-duty Track Rollers

“…From the above literature search, it may be found that great progress has been made in the rail-wheel contact. However, many studies are primarily focused on trains [21,22] and small engineering vehicles [23,24], and few studies investigate large heavy-duty mining equipment. At the same time, although many scholars have conducted a large amount of work on the analysis of track roller, they focus on the static load, which neglects the load variation law of each track roller in actual working conditions.…”