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The role of grain size on the ductile-brittle transition of a 2.25 Pct Cr-1 Pct Mo steel

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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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Authors and Affiliations

  1. Scientific Services Department, Central Electricity Generating Board, South Eastern Region, Scientific Services Centre, Canal Road, Gravesend, Kent, UK

    D. Lonsdale (Research Officer) & P. E. J. Flewitt (Research Officer)

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  1. D. Lonsdale
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  2. P. E. J. Flewitt
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Lonsdale, D., Flewitt, P.E.J. The role of grain size on the ductile-brittle transition of a 2.25 Pct Cr-1 Pct Mo steel. Metall Trans A 9, 1619–1623 (1978). https://doi.org/10.1007/BF02661944

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