Avaliação da fragilização por hidrogênio das ligas de níquel Hastelloy C-22 e C-276

Abstract

Nickel alloys are highly valuable materials with broad applications, particularly in the oil and gas industry, due to their mechanical properties, even at high temperatures, and their resistance to corrosion. Hydrogen embrittlement is a phenomenon that occurs in various materials, leading to a decrease in mechanical properties and potentially altering the fracture mode of materials, resulting in failures and losses for the industry. To assess susceptibility to hydrogen embrittlement, several tests have been established, one of which is the slow strain rate test (SSRT). The SSRT was conducted on C-22 and C-276 alloys, which were previously solution-treated and cold-deformed, to evaluate the resistance of each alloy to embrittlement. It was observed that both exhibited very similar characteristics, with C-276 experiencing a slightly greater loss of mechanical properties. However, the fracture mode of C-22 appeared more severe, showing a transition to more brittle failure characteristics.