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The transitional fracture behaviour of a range of pipeline and constructional steel plates in full thickness test pieces have been investigated. All steels investigated showed an increase in transition temperature with increasing displacement rate, X70 having the highest transition in the pipeline steels and old ferrite/pearlite steel the highest transition in the plate materials. RQT501T plate steel appeared to have a reduced susceptibility to cleavage in high displacement rate tests in larger section sizes. Recent improvements which have reduced Charpy impact transition temperatures in ferrite/pearlite steels have had smaller influence on the full plate thickness transitions temperature. Tempered martensite steels, particularly those containing nickel, appeared to have the lowest transition temperatures. An energy balance theory for crack arrest has been developed which is based on a comparison of the total elastic strain energy and the fracture energy from high displacement rate tests. Limited data suggest that surface properties are more important in controlling crack arrest than those at the centre of plates.

Additional information

Authors: PRIEST A, British Steel, Rotherham (GB);HOLMES B, British Steel, Rotherham (GB)
Bibliographic Reference: EUR 13948 EN (1997) 119pp., FS, ECU 20.00
Availability: Available from the (2)
ISBN: ISBN 92-828-0747-9
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