Research on Acicular Ferrite Nucleation Induced by Inclusions in Pipeline Steel Welding Heat Affected Zone

DOI

10.2991/icmsa-15.2015.167How to use a DOI?

Keywords

Pipeline Steel, Acicular Ferrite, Inclusions, Heat Affected Zone, High Heat Input Welding.

Abstract

In this paper, the acicular ferrite nucleation induced by inclusions in pipeline steel welding heat affected zone is researched, including the acicular ferrite nucleation induced by the in-situ reaction inclusions, the acicular ferrite nucleation induced by the formed inclusions after the micro-alloying and the micro-mechanism of acicular ferrite nucleation induced by inclusions. The results show that the size of the in-situ reaction inclusion is difficult to control. The use of A1, Nb, Ti, Ca, Mg and Zr alloy oxides and or their composite oxides micro-alloying can promote the nucleation of the intragranular acicular ferrite and can segment the original austenite grains in the interior of the coarse austenite grains effectively, which can improve the strength and toughness of the high heat input welding HAZ significantly. The four kinds of acicular ferrite nucleation mechanism exist mutual contradictions to each other currently. Different inclusions have different mechanism.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Jian-Ming Wang
AU  - Yan Liu
AU  - Kai Wang
AU  - Yang Liu
PY  - 2014/06
DA  - 2014/06
TI  - Research on Acicular Ferrite Nucleation Induced by Inclusions in Pipeline Steel Welding Heat Affected Zone
BT  - Proceedings of the 2015 International Conference on Material Science and Applications
PB  - Atlantis Press
SP  - 902
EP  - 905
SN  - 2352-541X
UR  - https://doi.org/10.2991/icmsa-15.2015.167
DO  - 10.2991/icmsa-15.2015.167
ID  - Wang2014/06
ER  -