The use of a vickers indenter in depth sensing indentation for measuring elastic modulus and vickers hardness

Franco, A.; Pintaúde, Giuseppe; Sinatora, Amilton; Pinedo, Carlos Eduardo; Tschiptschin, André Paulo

doi:10.1590/s1516-14392004000300018

Cited by 85 publications

(56 citation statements)

References 27 publications

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“…Dther measurements of hardness, which were done along the diameter, equally spaced of 0.25 mm, were done using a Fischerscope H100V microhardness tester with a Vickers indenter at a load of 35 mN (~3.6 gf). Due to the low load used in the last one, a special computational routine, which was developed for treating similar data, was used on the data treatment 13 . X-ray diffraction: X-ray diffraction patterns of untreated and nitrided samples were obtained using a Rigaku (Geigerflex model) diffractometer, Cu Kα radiation (λ = 0.154056 nm).…”

Section: Methodsmentioning

confidence: 99%

Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

et al. 2013

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When AISI 316L stainless steels are submitted to the nitriding process at temperatures lower than 450 °C, a high nitrogen content expanded austenite phase is formed, which shows higher hardness and higher pitting corrosion resistance compared to the untreated material. As a result, this material becomes adequate for biomedical application. The conditions of the nitriding technique, such as gas mixture, pressure, time and temperature, play an important role in some properties of the modified layer, including: thickness, hardness and N concentration along the layer. This paper explores a set of six samples of AISI 316L, nitrided at different times and temperatures, whose properties show important differences. The aim of this research is to investigate the correlation between the nitrided layer thickness (in the range of 0.77 to 11 µm) with both X-ray patterns characteristics and hardness measurements, which used two distinct loads. The results of this study show that: whereas the 3.6 gf load was suitable to measure the real hardness for four of the nitrided layers showing thickness ≥ 2.9 µm, the 50 gf load measured a substrate contribution, probably even for the highest thickness, 11 µm. Moreover, analyzing different reflections of the X-ray patterns showed evidence of the clear consistency between the X-Ray depths and the nitrided layer thicknesses: if the layer thickness is lower than the penetration depth of X-rays, two phases (austenite and expanded substrate) are present. If the layer thickness is higher, only the austenite is observed. Finally, concerning the citotoxicity property, all the samples, nitrided or not, were approved in the test for biocompatibility, indicating their potential use for biomedical applications.

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Section: Methodsmentioning

confidence: 99%

Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

et al. 2013

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“…Os resultados foram analisados por uma rotina computacional baseada no modelo de Oliver-Pharr (1992), detalhado em trabalho anterior por Franco JR et al (2004).…”

Section: Methodsunclassified

Estrutura e propriedades do aço inoxidável austenítico AISI 316L Grau ASTM F138 nitretado sob plasma à baixa temperatura

Tschiptschin

Pinedo²

2010

Rem: Rev. Esc. Minas

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ResumoOs aços inoxidáveis austeníticos possuem restrições para a nitretação nas temperaturas convencionais, próximas de 550ºC, devido à precipitação intensa de nitretos de cromo na zona de difusão. Essa precipitação eleva a dureza, mas deteriora as propriedades de corrosão. O uso do processo de nitretação sob plasma permite introduzir nitrogênio em temperaturas inferiores a 450ºC, levando à formação de uma fi na camada de austenita expandida pelo nitrogênio ( N ). Essa fase possui uma estrutura cristalina mais bem representada pelo reticulado triclí-nico, com elevada concentração de nitrogênio em solução sólida supersaturada, a qual promove um estado de tensões residuais de compressão capaz de elevar a dureza do substrato de 4 GPa para valores próximos de 14 GPa. O Módulo de Elasticidade mantém-se próximo de 200 GPa após a nitretação. Palavras-chave:Nitretação sob plasma, aço inoxidável austenítico, endurecimento, corrosão. Abstract

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“…Within this objective, a variety of models describing the contact area function have been developed [20,[40][41][42][43][44][45][46][47]. In nanoindentation, the complex area function expressing the contact area as a function of the contact indenter displacement is probably the most used: where C 1 through C 8 are constants.…”

Section: Indentation On Massive Materialsmentioning

confidence: 99%

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

Hemmouche¹,

Chicot²,

Amrouche³

et al. 2013

Materials Science and Engineering: A

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tThe elastic modulus of thin films can be directly determined by instrumented indentation when the indenter penetration does not exceed a fraction of the film thickness, depending on the mechanical properties of both film and substrate. When it is not possible, application of models for separating the contribution of the substrate is necessary. In this work, the robustness of several models is analyzed in the case of the elastic modulus determination of a porous aluminium oxide film produced by anodization of an aluminium alloy. Instrumented indentation tests employing a Berkovich indenter were performed at a nanometric scale, which allowed a direct determination of the film elastic modulus, whose value was found to be approximately 11 GPa. However, at a micrometric scale the elastic modulus tends toward the value corresponding to the substrate, of approximately 73 GPa. The objective of the present work is to apply different models for testing their consistency over the complete set of indentation data obtained from both classical tests in microindentation and the continuous stiffness measurement mode in nanoindentation. This approach shows the continuity between the two scales of measurement thus allowing a better representation of the elastic modulus variation between two limits corresponding to the substrate and film elastic moduli. Gao's function proved to be the best to represent the elastic modulus variation.

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The use of a vickers indenter in depth sensing indentation for measuring elastic modulus and vickers hardness

Cited by 85 publications

References 27 publications

Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

Estrutura e propriedades do aço inoxidável austenítico AISI 316L Grau ASTM F138 nitretado sob plasma à baixa temperatura

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

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