|About this Abstract
|Materials Science & Technology 2020
|Metallurgy and Magnetism
|Microstructural Development and Mechanical Property Changes Due to Temper Embrittlement in HY-80 Submarine Steel
|Charles D'Ambra, Jason Schibler, Michele V Manuel, Thomas W Krause, Aroba Saleem
|On-Site Speaker (Planned)
HY-80 is a low-alloy, low-carbon steel used primarily in submarines for its high strength and toughness. HY-80 is susceptible to temper embrittlement caused by the migration of impurity elements and carbides towards the grain boundaries when held between the embrittling range of 370 to 600 ºC. There is currently no widespread non-destructive method for testing early stages of temper embrittlement of HY-80 steel. The purpose of this paper is to analyze the microstructural development and changes in mechanical properties to determine their relation to magnetic property variations. Five samples of HY-80 were heat treated at 525 °C for different holding times to induce varying degree of temper embrittlement. These samples were then characterized by scanning electron microscope (SEM), and Vickers microhardness tests. It was observed that hardness changed with holding time, and these changes were attributed to change in the carbide precipitate density within the matrix due to temper embrittlement.