Journal
WEAR
Volume 524, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2023.204804
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Austenitic stainless steels have good corrosion resistance properties, but their use in components with motion under load is limited by poor galling behavior. In this study, the galling behavior of a dissimilar austenitic stainless steel pair was examined under different environmental temperatures, rotational speeds, and sliding distances. It was found that galling became more severe with increased temperature, but was not significantly affected by sliding speed or interruptions during rotation. The measurement of friction coefficient and surface observations revealed that galling did not occur initially, but was a result of surface damage accumulated during sliding.
Austenitic stainless steels have attractive properties for use in corrosive environments, but their use in components where motion under load is experienced (such as valves) is limited by their poor galling behaviour. Whilst stainless steels with improved performance have been developed over many years, the basic understanding of the key parameters in galling of standard stainless steels is not well understood. In this work, the galling behaviour of a dissimilar austenitic stainless steel pair is explored via testing in an instrumented ASTM G196-type test. Key variables examined are environmental temperature (room temperature and 100 degrees C), rotational speed (2.1 rpm and 5.5 rpm), and the sliding distance (from a quarter of a turn up to five turns). Galling was observed to become more severe with increased temperature, but was not significantly affected by either sliding speed (in the range examined) or interruptions during the rotation. The measurement of friction coefficient along with surface observations revealed that galling does not take place within the initial period of sliding; however, damage is being accrued by the sample surfaces which then results in subsequent observable galling as the sliding distance is increased. The importance of measuring torque during galling tests is illustrated, and the findings provide useful information with regard to those test variables that require critical control (and which do not) during conduct of a galling test programme.
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