Study of the evolution of the residual stress state in thermal barrier coatings sprayed on AISI 304 stainless steel

• Published in: Dyna (Medellín, Colombia) Colombia), 2016-06, Vol.83 (197), p.159-165
• Main Authors: Medina Flores, José Martín, Poblano Salas, Carlos Agustín, Barceinas Sánchez, J.D.O, Domínguez López, Iván, Yáñez Contreras, Pedro, García García, Adrián Luis
• Format: Article
• Language: eng ; por
• Subjects: ENGINEERING, MULTIDISCIPLINARY; esfuerzos residuales; modified layer removal method; Modified Layer Removal Method for Duplex Coatings; método de remoción de capa modificada; método de remoción de capa modificada para recubrimientos dúplex; recubrimiento barrera térmica; residual stress; rociado térmico; thermal barrier coating; thermal spraying
• ISSN: 0012-7353
• DOI: 10.15446/dyna.v83n197.51150

Thermal barrier coatings (TBC) were manufactured by thermal spraying of CoNiCrAlY and YSZ powders, which constituted the bond coat (BC) and top coat (TC), respectively. The BC was deposited on stainless steel substrates by a high velocity oxygen fuel (HVOF) system whilst the TC was deposited on the BC by an atmospheric plasma spraying (APS) gun .TBCs were heat treated at 1200 °C for 8 and 16 h in order to determine the evolution of the residual stress state as a function of time. The residual stress profiles were obtained by employing the Modified Layer Removal Method (MLRM) and an adaptation of this for bilayer coatings called Modified Layer Removal Method for Duplex Coatings (MLRMDC). It was observed that as the exposure time was increased, the compressive residual stresses increased, which was more noticeable in the BCs. The TBCs without heat treatment revealed tensile residual stresses.