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Upper nose temper embrittlement of a Ni-Cr steel

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Abstract

Temper embrittlement of a Ni-Cr steel was investigated both isothermally and with temperature changes. Embrittlement was most rapid in two temperature ranges: 490° to 550°C and just below the Ae1, near 675°C. Embrittlement in the lower range was accompanied by rapid grain boundary attack by ethereal picric acid and fracture along austenite grain boundaries. Embrittlement in the upper range was accompanied by slow attack by ethereal picric acid and fracture mostly along ferrite grain boundaries. No increase in ferrite grain size was observed, but carbide particles grew during treatments in the upper temperature range. Embrittlement during slow cooling from 675°C appeared to be associated with the lower range.

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TP 4309E. Manuscript, Sept. 12, 1955. Cleveland Meeting, October 1956.

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Jaffe, L.D., Buffum, D.C. Upper nose temper embrittlement of a Ni-Cr steel. JOM 9, 8–16 (1957). https://doi.org/10.1007/BF03398437

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  • DOI: https://doi.org/10.1007/BF03398437

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