Effects of porosity on delamination wear behaviour of sintered plain iron

Abstract

Haynes.1 The presence of pores is accompanied by a decrease in strength and ductility as well as a detrimental in uence The role of porosity on the wear behaviour of sintered on conductivity and magnetic properties.2 Meanwhile the iron was investigated. Sintered iron was used in initial attempts for mechanical characterisation of sintered preference to steel because the various alloy additions materials were focused on static tests. However, in order and matrix heterogeneity in the latter might aVect the to favour the use of these materials in new applications, microwear behaviour and the role of porosity. The their performance under diVerent loading conditions must wear tests were performed in a pin on disc test bed be taken into account. In particular for the production of under 10-40 N loads at 0•56 m sÕ 1 sliding speed in air.high performance PM parts, dynamic properties have to be For the given tribological conditions, it was found that carefully assessed. In recent years the fatigue behaviour of the wear mechanism is delamination or mechanical sintered steels has been studied in numerous investigations wear, which is basically similar to that of wrought (e.g. . In this context, the role of microstructure materials according to subsurface crack generation and particularly the eVect of porosity as indispensable and crack propagation processes. However, the open characteristics of PM parts on the fatigue properties were pores on the surface act as a site for generation and studied both phenomenologically and scienti cally. Some collection of wear debris. Furthermore, the pores aVect useful models have also been developed for predicting the the stress distribution and the metal deformation of endurance limit.4,5 The in uence of the pores on crack subsurface layers during dry sliding. Accumulation initiation and crack propagation under cyclic loading was of the plastic shearing on the subsurface results in determined as well.3,8,10 nucleation of cracks that further grow by shearing:It is obvious that numerous sintered parts are being used the fracture process. The propagation of subsurface not only under cyclic loading but also under sliding concracks at a critical depth parallel to and eventually up dition. In fact, many applications require a sliding contact to the sliding surface results in the formation of akebetween mechanical components. Therefore, a complete like debris. This paper presents the role of porosity, understanding of sliding wear of sintered parts has to be which is the peculiar property of PM materials, on achieved. Similar to the fatigue properties, several investithe dry sliding behaviour of sintered iron as a model gations into dry sliding behaviour of sintered ferrous material. The implication of Archard's law for describing materials can be found in the literature (e.g. . the results obtained is presented. The shortcomings inIn conclusion, the results of previous investigations highevaluation of the wear behaviour of sintered materials light the peculiar role of porosity (and, for alloy ...

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