SYMPOSIA PAPER Published: 01 January 1999

The Effect of Heat Treatment on Phosphorus Segregation in a Submerged-Arc Weld Metal


Intergranular fracture (IGF) has been observed in carbon-manganese steels after irradiation or high temperature exposure for prolonged periods. The effect is associated with an increase in the ductile-brittle transition temperature and has been related to phosphorus diffusion to grain boundaries. Phosphorus also diffuses thermally at the temperatures used for post-weld heat treatments such that in principle, the slightly different heat treatments given to different parts of a large vessel could lead to differing grain boundary phosphorus coverage and hence susceptibility to IGF. The effect of typical heat treatments on phosphorus coverage has been investigated using a finite difference model based on a theory that has been fitted to a wide range of constant temperature data. Regardless of previous history, the grain boundary coverage of phosphorus was predicted to depend on the final anneal and cooling rate. These differed insufficiently in the typical heat treatments to produce significant differences in segregation. It was concluded that the ductile-brittle transition temperature in submerged-arc welds would be unaffected in vessels that had seen typical post-weld heat treatments.

Author Information

Beere, WB
Magnox Electric plc, Berkeley Centre, Gloucestershire, United Kingdom
Buswell, JT
jtb Materials & Design, Gloucestershire, United Kingdom
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E10
Pages: 317–330
DOI: 10.1520/STP13872S
ISBN-EB: 978-0-8031-5395-0
ISBN-13: 978-0-8031-2614-5