Preprint Article Version 1 This version is not peer-reviewed

Ultra Low Temperature Process Effects on Micro-Scale Abrasion of Tool Steel AISI D2

Version 1 : Received: 16 November 2018 / Approved: 19 November 2018 / Online: 19 November 2018 (10:32:44 CET)

How to cite: Gobbi, S.J.; Gobbi, V.J.; Reinke, G. Ultra Low Temperature Process Effects on Micro-Scale Abrasion of Tool Steel AISI D2. Preprints 2018, 2018110448 (doi: 10.20944/preprints201811.0448.v1). Gobbi, S.J.; Gobbi, V.J.; Reinke, G. Ultra Low Temperature Process Effects on Micro-Scale Abrasion of Tool Steel AISI D2. Preprints 2018, 2018110448 (doi: 10.20944/preprints201811.0448.v1).

Abstract

Ultra Low Temperature Process (ULTP) involve the material cooling in temperatures close to the liquid nitrogen (-196 °C), which is different from the cold-treatment (CT) made in temperatures close to -80 °C. ULTP treatments could raise the tool steel wear resistance through microstructural change that occurs on the material, enhancing, that way, the tools and dies lifetime. To investigate the impact on the wear resistance of tool steel AISI D2, micro abrasive wear tests were carried out and an analysis based on the Archard’s law was considered, evaluating specimen mass loss by laser interferometry. Micro hardness tests, X-ray diffractometry, scanning and optical microscopy and quantitative evaluation of carbides with image analysis were carried out aiming material characterization. Micro-scale abrasion tests shown a wear coefficient k about 1.73E-7 e 2.61E-7 mm3/N.mm to the specimens that received the ULTP phase and 3.12E-7 mm3/N.mm to the conventional thermal treatment, representing a wear resistance increase of 16.3 – 44.5% to cryogenically treated specimens. The results demonstrated a micro hardness improvement, ranging from 0.9 - 4.7% for the cryogenically treated specimens, when compared to the bulk material. This effect is related, mainly, to the retained austenite transformation in martensite and to the increase in the amount of fine secondary carbides dispersed in the martensitic matrixes of cryogenically treated specimens with ULTP. The best wear resistance improvements, on micro-scale, were achieved when the ULTP step is performed immediately after tempering.

Subject Areas

Micro-Scale Abrasion; Ultra Low Temperature Process (ULTP) Tool Steel AISI D2;

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