Abstract:
The global shift toward decarbonization has positioned hydrogen (H2) as a key energy vector. In combustion engines, especially for commercial vehicles, H2 offers high efficiency at full load, tolerance to low-purity H2, lower costs, and improved durability over other zeroemission solutions. A key challenge is selecting materials that withstand hydrogen induced damage – a process that reduces toughness and increases cracking risk. Austenitic stainless steels resist hydrogen damage but are costly and have limited wear resistance. High-strength steels offer greater strength at lower costs but are more prone to hydrogen damage. Cast irons emerge as a promising alternative, combining strength, cost-effectiveness, termal properties, and low susceptibility to hydrogen damage due to graphite. This study investigates high temperature hydrogen attack (HTHA) mechanism in cast irons and forged steels. Samples were hydrogenated in an autoclave for over 2,000 hours at 300 bar and 375°C, simulating severe H2 engine conditions. Results confirmed the superior resistance of cast irons. Additionally, findings were compared with global standards for H2 combustion engines, providing insights into material selection strategies to ensure high durability in future applications.
Referência:
OBARA, Rafael Brisolla; VOIGT, Anns Louise; CABEZAS, Carlos de Suza; FANTINI, Luiza de Brtio; MOREIRA, Marcelo Ferreira; MOREIRA, Anna Ramus; CHAVES, Luís Fernando Fiuza. High-durability hydrogen combustion engines: a comparative study of cast irons and steels. In: SIMPÓSIO INTERNACIONAL DE ENGENHARIA AUTOMOTIVA, 32., 2025, São Paulo. Anais… 8p.
Documento com acesso restrito. Logar na BiblioInfo, Biblioteca GITE/IPT para acessar o trabalho em PDF:
https://escriba.ipt.br/pdf_restrito/179700.pdf
