Elemental distribution in the martensite–austenite constituent in intercritically reheated coarse-grained heat-affected zone of a high-strength pipeline steel

Xueda Li,Chengjia Shang,Xiaoping Ma,Baptiste Gault,S.V Subramanian,Jianbo Sun,R.D.K Misra

doi:10.1016/j.scriptamat.2017.06.017

Elemental distribution in the martensite–austenite constituent in intercritically reheated coarse-grained heat-affected zone of a high-strength pipeline steel

Xueda Li, Chengjia Shang + Show 5 more

https://doi.org/10.1016/j.scriptamat.2017.06.017

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Journal: Scripta Materialia	Publication Date: Jul 11, 2017
Citations: 73

Affiliation: China University of Petroleum, East China, University of Science and Technology Beijing, McMaster University, Max-Planck-Institut für Eisenforschung, The University of Texas at El Paso

#Intercritically Reheated Coarse-grained Heat-affected Zone #Martensite Austenite Constituent + Show 8 more

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Abstract

We have studied here the distribution of carbon and alloying elements in the martensite-austenite (M-A) constituent in intercritically reheated coarse-grained heat-affected zone (ICCGHAZ) of a high-strength pipeline steel using atom probe tomography (APT). Notable enrichment of C (0.49wt%) and Mn (2.32wt%) was observed within the M-A constituent, which induced the formation of lath martensite and deteriorated the toughness. Elemental segregation in the interfacial region between M-A constituent and matrix may contribute to the debonding mechanism of M-A constituent and assist nucleation of cleavage cracks. Distribution of solute Nb indicated no apparent difference between the matrix and M-A constituent.

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