Research on Acicular Ferrite Nucleation Induced by Inclusions in Pipeline Steel Welding Heat Affected Zone
Year: 2014
Type: conference-paper
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.
Authors: Jian-Ming Wang, Yan Liu, Kai Wang, Yang Liu
Institution: Shenyang University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W1934720797