The role of grain size on the ductile-brittle transition of a 2.25 Pct Cr-1 Pct Mo steel |
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Authors: | D Lonsdale P E J Flewitt |
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Affiliation: | (1) Scientific Services Department, Central Electricity Generating Board, South Eastern Region, Scientific Services Centre, Canal Road, Gravesend, Kent, UK |
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Abstract: | The ductile-brittle transition temperature of a 2 1/4 pct Cr-1 pct Mo steel has been meas-ured using ‘V’ notch Izod impact
specimens for an unembrittled and embrittled 2 1/4 pct Cr-1 pct Mo steel with prior austenite grain sizes within the range
40 to 150 μm. The mi-crostructure of this steel was upper bainite. The variation of yield strength with grain size obeys a
Hall-Petch relationship. The ductile-brittle transition temperature was found to have a pronounced grain size dependence for
both unembrittled, 15 K mm1/2, and embrittled, 19 K mm1/2, specimens. The bainite colony size was found to vary as the prior austenite grain size. From the low temperature quasi-cleavage
facet size, together with metallographic observations of crack path, it has been concluded that bainite colony size rather
than prior austenite grain size is the effective grain size. |
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