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Article

Influence of Niobium or Molybdenum Addition on Microstructure and Tensile Properties of Nickel-Chromium Alloys

1
Department of Materials and Technology, Campus de Guaratinguetá, São Paulo State University, 12516-410 Guaratinguetá, Brazil
2
Institute of Science and Technology, Federal University of Alfenas, 11999, 37715-400 Poços de Caldas-MG, Brazil
3
Engineering School of Lorena, University of São Paulo, 12602-810 Lorena, SP, Brazil
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 589; https://doi.org/10.3390/met9050589
Received: 26 March 2019 / Revised: 19 April 2019 / Accepted: 9 May 2019 / Published: 22 May 2019
(This article belongs to the Special Issue Numerical Modelling and Simulation of Metal Processing)
This work discusses on influence of niobium or molybdenum addition on microstructure and tensile properties of NiCr-based dental alloys. In this regard, the Ni-24Cr-8Nb, Ni-22Cr-10Nb and Ni-20Cr-12Nb (wt. %) alloys produced by arc melting process. To compare the typical Ni-22Cr-10Mo dental alloy was also produced. These ternary alloys were analyzed by chemical analyses, X-ray diffraction (XRD), scanning electron microscopy (SEM), electron dispersive spectrometry (EDS), thermogravimetric analysis (TG), Vickers hardness and tensile tests. Although the mass losses of the samples during arc melting, the optical emission spectrometry showed that the initial compositions were kept. The Ni-22Cr-10Mo alloy produced a matrix of Niss (ss—solid solution), whereas Ni3Nb disperse in a Niss matrix was also identified in Ni-Cr-Nb alloys. Excepting for the Ni-22Cr-10Nb alloy with mass gain of 0.23%, the as-cast Ni-Cr alloys presented mass gains close to 0.4% after heating up to 1000 °C under synthetic airflow. The hardness values, the modulus of elasticity, yield strength and ultimate tensile strength have enhanced, whereas the ductility was reduced with increasing niobium addition of up to 12 wt.-%.The Ni-22Cr-10Mo alloy presented an intergranular fracture mechanism containing deep dimples and quasi-cleavage planes, whereas the shallow dimples were identified on fracture surface of the as-cast Nb-richer Ni-Cr alloys due to the presence of higher Ni3Nb amounts. View Full-Text
Keywords: microstructure; tensile properties; intermetallics; casting; phase transformation microstructure; tensile properties; intermetallics; casting; phase transformation
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MDPI and ACS Style

Souza, M.A.d.; Fiorin, B.d.O.; Hashimoto, T.M.; Rosifini, A.P.; Nunes, C.A.; Baptista, C.A.R.P.; Ramos, A.S. Influence of Niobium or Molybdenum Addition on Microstructure and Tensile Properties of Nickel-Chromium Alloys. Metals 2019, 9, 589. https://doi.org/10.3390/met9050589

AMA Style

Souza MAd, Fiorin BdO, Hashimoto TM, Rosifini AP, Nunes CA, Baptista CARP, Ramos AS. Influence of Niobium or Molybdenum Addition on Microstructure and Tensile Properties of Nickel-Chromium Alloys. Metals. 2019; 9(5):589. https://doi.org/10.3390/met9050589

Chicago/Turabian Style

Souza, Marisa A.d., Bárbara d.O. Fiorin, Tomaz M. Hashimoto, Ana P. Rosifini, Carlos A. Nunes, Carlos A.R.P. Baptista, and Alfeu S. Ramos 2019. "Influence of Niobium or Molybdenum Addition on Microstructure and Tensile Properties of Nickel-Chromium Alloys" Metals 9, no. 5: 589. https://doi.org/10.3390/met9050589

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