The response of boronized 34CrAlMo5-10 (EN41B) steel to nanoindentation, oxidation, and wear

Autor: Antunes, Vinícius Gabriel, 1984, Alvarez, Fernando, 1946
Přispěvatelé: UNIVERSIDADE ESTADUAL DE CAMPINAS
Rok vydání: 2021
Předmět:
Zdroj: Repositório Institucional da Unicamp
Universidade Estadual de Campinas (UNICAMP)
instacron:UNICAMP
Repositório da Produção Científica e Intelectual da Unicamp
Popis: Agradecimentos: The authors would like to thank Ms. Letícia T. Bim (UCS, Brazil) and Dr. Vinod Kumar’s research-team (IITI) for the cooperation in GDOES and TGA experiments, respectively. Authors acknowledge Raman Spectrometer facility (supported by DST-FIST (grant number SR/FST/PSI-225/2016)) at Dept. of Physics, IITI. The Nanoindentor facility of IIT Bombay is also kindly acknowledged. GDOES measurements were partially supported by the Grant CNPq-INCT-INES # 465423/2014-0. XPS analysis was supported by the projects from FAPESP 2012/10127-5; 2018/24461-0; 2019/24095; 2019/18460; 2019/00757-0. CAF, FA, and VA are the CNPq fellows. Authors acknowledge Raman Spectrometer facility (supported by DST-FIST (grant number SR/FST/PSI-225/2016)) at Department of Physics, IITI. The Nanoindentor facility of IIT Bombay is also kindly acknowledged. GDOES measurements were partially supported by the Grant CNPq -INCT-INES # 465423/2014-0. XPS analysis was supported by the projects from FAPESP 2012/10127-5; 2018/24461-0; 2019/24095; 2019/18460; 2019/00757-0. CAF, FA, and VA are the CNPq fellows Abstract: The present study deals with the properties of boronized and non-boronized low-alloy steel (34CrAlMo5-10). Specimens are characterised using microscopy, various spectroscopic techniques, nanoindentation, surface profilometer, and tribometer. The boronized region contains (i) (Fe, M)(2)B columns and (ii) matrix between the columns. Nanoindentation study reveals the difference in the mechanical behaviour of boride, matrix, and core regions. Strain-rate sensitivity of different regions of the specimen cross-section varies between 0.005 and 0.011. The boride phase is more sensitive to the strain-rate than matrix and core. The room-temperature oxidation resistance of the steel surface is enhanced by the presence of a higher proportion of mixed-boride and the oxide layer enriched with Cr2O3. At 550 and 850 degrees C, boronized specimens have higher oxidation resistance than the non-boronized specimens, where the layer of iron-borates protects the surface. At 200 degrees C, the boronized specimen has deprived oxidation resistance. Amongst the investigated wear-parameters, the maximum and minimum wear-resistance of the boronized surface is about 46 and 8 times the wear-resistance of the non-boronized surface, respectively. A steeper drop in the tribological advantage gained by the boronizing treatment is perceived with the increase in load, especially under higher sliding speed CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP Fechado
Databáze: OpenAIRE
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