Abstract
Temper embrittlement of low alloy steels (Ni and Mn) was studied by means of Auger electron spectroscopy, scanning electron microscopy and Charpy test. Addition of nickel (less than 10 wt%) increased segregation rate of phosphorus (less than 0.09 wt%) to free surfaces by the factor of 10–100 compared to that in Fe–P alloys at 500°C. Manganese steel was investigated to discuss the relation between the amount of phosphorus in the prior austenite grain boundary and the degree of embrittlement. Modified V-notch Charpy specimens were fractured in a UHV apparatus at the temperature of -150°C. It was concluded that the temper embrittlement in the manganese steel is dominantly attributed to the segregation of phosphorus to the prior austenite grain boundaries.
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