In-situ high temperature stress analysis of Ti(C,N) coatings on functionally graded cemented carbides by energy dispersive synchrotron X-ray diffraction

Autor(es)

Garcia, Jose ^[1] ; Pinto, Haroldo ^[2] ; Ramos-Moore, Esteban ^[3] ; Espinoza, Carlos ^[3] ; Ostby, Jonas ^[1] ; Coelho, Rodrigo ^{[4, 5]}

Afiliação do(s) autor(es)

^[1] AB Sandvik Coromant R&D, Lerkrogsvagen 19, SE-12680 Stockholm - Sweden

^[2] Univ Sao Paulo, Escola Engn Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[3] Pontificia Univ Catolica Chile, Fac Fis, Santiago 7820436 - Chile

^[4] SENAI CIMATEC, Inst Inovacao Conformacao & Uniao Mat, Ave Orlando Gomes 1845, BR-41650010 Salvador, BA - Brazil

^[5] Helmholtz Zentrum Berlin Mat & Energie GmbH, Albert Einstein St 15, D-12489 Berlin - Germany

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS; v. 56, p. 27-34, APR 2016.
• Citações Web of Science: 7

Resumo

We report on in-situ high temperature X-ray thermal stress analysis of chemically graded Ti(C,N) coatings deposited on functionally graded cemented carbide substrates by chemical vapor deposition. The in-situ analyses were performed by energy dispersive X-ray diffraction using synchrotron radiation. The samples were subjected to one individual thermal cycle from room temperature to 800 C and cooled down to room temperature again. The stresses were determined using the sin(2)Psi method in the Psi geometry combined with scattering vector measurements in order to unravel the compositional influences on the lattice strain distributions. It was found that the Ti(C,N) thin film presents a cycling residual stress behavior (tensile-compressive-tensile) connected to the temperature cycle. If top-blasting is applied on the thin film layer after the coating process, compressive stresses are generated. These compressive stresses induced by top-blasting are partially released after the high temperature thermal cycle. The functionalization of the cemented carbide substrate influences the level of stresses developed in the coating. The stress behavior as a function of temperature is discussed with the support of finite element modeling by introducing a bi-linear plasticity model to calculate strain relationships which is in agreement with the synchrotron measurements. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/11391-2 - Junção por fricção e mistura mecânica em ligas tixofundidas de magnésio de alto desempenho
• Beneficiário: Haroldo Cavalcanti Pinto
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores