Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EVALUATION OF THE THRESHOLD LINEAR ELASTIC TOUGHNESS IN API 5CT P110 STEEL BY MEANS OF HYDROGEN ASSISTED FRACTURE TESTS
Submission Author:
Misael Souto de Oliveira , PB , Brazil
Co-Authors:
Misael Souto de Oliveira, Antonio Almeida Silva, Marco Antonio dos Santos, Jorge Antonio Palma Carrasco, João Vitor de Queiroz Marques
Presenter: Antonio Almeida Silva
doi://10.26678/ABCM.COBEM2017.COB17-0597
Abstract
The interaction of materials used in the fabrication of equipment with the environments to which they are put into service frequently causes their degradation. The hydrogen embrittlement presents as a degradation process characterized by the nucleation and propagation of cracks in the materials, being classified as one of the most dangerous to structural integrity, since it can occur suddenly and difficult to perceive, resulting in catastrophic fracture. Therefore, it is necessary to make efforts to improve and develop methods and criteria for material selection, inspection and maintenance of equipment, where the operating conditions favors the occurrence of a environment assisted fracture. For this, fracture toughness tests were performed on API 5CT P110 steel, monitoring the crack growth by means of the alternating current potential drop technique. The tests were conducted in synthetic sea water solution under cathodic overprotection potential. The results showed a important decrease in the fracture toughness of the steel, occurring crack initiation and intergranular crack propagation.
Keywords
Hydrogen embrittlement, potential drop, fracture toughness
