Gradient structure-phase states formed in Hadfield steel during dry sliding wear

Abstract

and TEM analyses have been used to study the state of the surface layer and the evolution of the defect substructure of Hadfield specimens as a function of depth below the worn surface. Gradient structure is shown to form in the examined steel type during dry sliding wear. The defect density in the structure and its microhardness are found to reduce with depth below the worn surface.

Cooling kinetics effect on abrasive wear behaviour of an ASTM A128 steel

“…The microstructure of the samples was characterized using a JEOL-JSM-5910 Scanning Electron Microscope equipped with an Energy Dispersive X Ray detector and a Philips PW1700 X-ray diffractometer equipped with a PW1825 generator, graphite monochromator at an angle of 26º and Cu radiation. Micro-hardness was measured according ASTM E384-11 [5] using a 401 MVA Wilson Wolpert micro-Vickers hardness tester under an indentation load of 1000 g for 15 s [1]. The samples mass loss was measured using an analytical scale with a sensitivity of 0.0001 g. Wear resistance analysis was realized determining the volumetric loss and wear rate of the specimens according to equations of volumetric loss (1) and wear rate (2) [2].…”

“…Elevated temperature produced considerable surface decarburization and loss of manganese leading to the formation of martensite. The martensite layer is hard and brittle, which allows the loss of material during the abrasive wear process, which results in lower wear resistance compared to the as-cast state material that presents a plastic deformation process allowing the deformation hardening process and therefore a significant increase in its wear resistance [1,7,8,9]. In addition, there is a greater oversaturation of austenitic phase in elements such as carbon, chromium and in 30% brine-cooled material manganese due to the greater severity of hardening causing an increase in hardness which is consistent with the results obtained.…”