The present paper describes a reverse temper embrittlement, RTE, assessment of two series of CrMo turbine bolts which had experiences differing service times at operating temperatures of around 400°C. It was established that when RTE was identified (a) the condition was one of only partial embrittlement and (b) two distinct regimes, partial and non-embrittled were clearly identified on an average grain size, d, versus % bulk phosphorus plot. The interface between the two states of embrittlement could be described by a simple expression.
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