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Mechanical Characterization and Micro-Wear of FeB-Fe<sub>2</sub>B Layers on Boriding AISI D2 and AISI 4340 Steels
Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
- 1 Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
- 2 Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
- 3 Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
- 4 Programa de Pós Graduação em Engenharia e Materiais (PPGEM), Universidade Tecnológica Federal do Paraná (UTFPR), Curitiba, Brasil
Materials Sciences and Applications·Volume 12 (2021)·Pages 330–344·Published 1 July 2021·DOI10.4236/msa.2021.127022
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Abstract
The mechanical behavior and wear of the different hardened phases with bore-induced changes in AISI 4340 and AISI D2 steels were investigated. The hardness and modulus of elasticity were measured by nanoindentation and the values obtained for the layers in AISI D2 steel were 18 GPa and 325 GPa in the Fe 2 B boride phase, and 20 GPa and 360 GPa in the FeB boride phase, respectively. The AISI 4340 steel presented mainly the Fe 2 B phase. It was then possible to analyze the coefficient of friction obtained in the Fe 2 B phase of the steel AISI 4340 presented a range of 0.04 to 0.06. The AISI D2 steel presents two different phases in the boride layer being the coefficient of friction higher for the test in the FeB phase than for Fe 2 B, and the values vary from 0.065 to 0.075. These parameters were obtained with micro-wear tests. No adhesion failures were observed after the sliding tests in the interface of the two different boride layers. Cracks in the FeB phase after the sliding test were much more frequent.
KeywordsIron BorideMicro-Wear TestMechanical PropertiesBoriding
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