Influence of phosphorus on weld heat affected zone toughness in niobium microalloyed steels
作者:
FaulknerR. G.,
期刊:
Materials Science and Technology
(Taylor Available online 1989)
卷期:
Volume 5,
issue 11
页码: 1095-1101
ISSN:0267-0836
年代: 1989
DOI:10.1179/mst.1989.5.11.1095
出版商: Taylor&Francis
数据来源: Taylor
摘要:
AbstractWeld heat affected zone microstructures have been simulated in a niobium microalloyed C–Mn steel. These structures have been Charpy impact tested and examined metallographically. Troughs were observed in the plots of Charpy energy against post-weld heat treatment time at 600°C. The explanation for this behaviour is shown to be associated with non-equilibrium segregation of phosphorus to lath boundaries in the steel. Mathematical modelling of non-equilibrium segregation, together with high spatial resolution analytical electron microscopy results, support this contention. Using the predictions of the model, several suggestions are made concerning the alleviation of phosphorus segregation to boundaries and hence the reduction of cracking susceptibility during post-weld heat treatment of the steel.MST/994
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