Charles D’Ambra

Charles D’Ambra

Mechanical and Microstructural Characterization of HY-80 Steel

Authors

Charles D’Ambra, Jason Schibler, Michael Roberts, Michele V. Manuel, Thomas W. Krause, Aroba Saleem

Mentor

Dr. Aroba Saleem

College

Herbert Wertheim College of Engineering

Abstract

HY-80 is a low-alloy, low-carbon steel used primarily in submarines for its high strength and high toughness. HY-80 steel 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. Temper embrittlement results in the loss of ductility and reduction of impact toughness of the material. There is currently no widespread non-destructive method for testing of early stages of temper embrittlement of HY-80 steel. The purpose of this project is to analyze the microstructural development and changes in mechanical properties to determine their relation to magnetic properties. Samples of HY-80 were heat treated at 525 °C for different holding times to induce varying degree of temper embrittlement. Before and after heat treatment, samples were characterized by scanning electron microscope (SEM). In addition, hardness measurements were taken before and after heat treatment using Vickers microhardness testing. It was observed that hardness varied with holding time, and these changes were attributed to the change in carbide precipitate density, size, and location within the matrix.

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