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Many steel specifications require certain minimum toughness levels to be achieved in the weld heat affected zone (HAZ). The reasons for poor toughness are the brittle micro-constituents such as coarse bainite and Widmanstätten ferrite which can form as the grain coarsened austenite is cooled rapidly following welding. Particles such as titanium nitride have been used to restrict austenite grain growth, and hence improve weld HAZ toughness, but even these particles can coarsen near the weld fusion line, leading to a loss of grain size control. Highly stable particles such as oxides or sulphides have the potential of restricting austenite grain growth at high temperatures, and may also act as nucleation sites for transformation products such as acicular ferrite which have a high intrinsic toughness. The objectives of this project were therefore to examine the influence of stable particles on HAZ structure and properties of structural steels with yield strengths of approximately 350 N/mm{2}.

Additional information

Authors: CROWTHER D N, British Steel plc, London (GB)
Bibliographic Reference: EUR 18389 EN (1998) 111pp., ECU 20.00
Availability: Available from the (2)
ISBN: ISBN 92-827-8232-8
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