A study was performed of the effects of phosphorus and arsenic as embrittling agents on the Charpy impact behavior of resulfurized AISI 8640 steel. The steel was heat-treated to several bainitic and one martensitic condition with a wide range of strength levels. Charpy transition temperature curves were developed for each condition. SEM fractography was used to analyze the fracture behavior of the various heat-treated structures. The results show that AISI 8640 steel with high phosphorus and high arsenic was embrittled in the low-strength bainitic condition as well as in the high-strength martensitic condition. Embrittlement was evidenced by low Charpy impact energies, increased transition temperatures, and an intergranular fracture mode.
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