Experimental Investigation of Engineering Materials under Repetitive Impact with Slurry Conditions
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ORIGINAL PAPER
Experimental Investigation of Engineering Materials under Repetitive Impact with Slurry Conditions F. Brownlie1,2 · T. Hodgkiess2 · A. M. Galloway1 · A. Pearson3 Received: 2 October 2020 / Accepted: 20 November 2020 © The Author(s) 2020
Abstract In some industrial situations, components are subject to repetitive impact in the presence of a slurry. A novel repetitive impact-with-slurry test rig was developed to evaluate the behaviour of a wide range of engineering materials in such conditions. The test materials could be categorised into five main groups – heat treated steels, stainless steels, chromium cast irons, hardfacing coatings and superalloys. Three-dimensional surface topography was used to quantify the depths and volumes of the produced wear scars. Post-test metallurgical examination was also conducted to further evaluate the wear processes. The wear mechanisms could be split into two main groups of materials; ductile materials were observed to plastically deform and hard/brittle materials demonstrated cracking/spalling mechanisms. Hardened martensitic-type materials exhibited the greatest resistance to repetitive impact wear. Keywords Repetitive impact · Slurry · Engineering materials
1 Introduction Repetitive impact wear is described as recurring solid body impacts, where the contacting surfaces are wearing [1]. There are two types of repeated impacts. When there is a tangential or rotational element which results in sliding or rolling, this is referred to as compound impact. When there is no rotational or tangential element, this defined as normal impact. Engineering components used for fluid transport such as valves (globe, check and dart) that are employed in the oil and gas as well as power generation industries, experience repetitive impact wear. In the mineral processing industry, components such as crushers, breakers and sizing screens also experience material loss due to repetitive impact damage [2, 3]. A variety of experimental set-ups have been developed to assess repetitive impact wear of materials for different * F. Brownlie [email protected] 1
Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow, UK
2
Weir Advanced Research Centre, Glasgow, UK
3
Ascott Metallurgical Ltd, Glasgow, UK
engineering applications. Five main types of such test rigs have been identified: reciprocating pin on disk, pivot hammer, high velocity impact gun, ball on plate and repetitive impact with dry abrasion. A brief summary of each type of repetitive impact wear test rig, the relevant engineering applications and the main material degradation mechanisms are discussed below.
1.1 Reciprocating Pin on Disk The pin on disk wear testing method is typically used to assess the sliding wear resistance and coefficient of friction of materials [4], however, this testing apparatus has been adapted by researchers with the capability of testing both compound impact wear and transverse sliding wear [5]. This is aimed at engineering components that experi
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