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

被引：76

作者：

Li, Xueda ^{[1
]}

Shang, Chengjia ^{[2
]}

Ma, Xiaoping ^{[3
]}

Gault, Baptiste ^{[4
]}

Subramanian, S. V. ^{[3
]}

Sun, Jianbo ^{[1
]}

Misra, R. D. K. ^{[5
]}

机构：

[1] China Univ Petr East China, Coll Mech & Elect Engn, Qingdao, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing, Peoples R China

[3] McMaster Univ, Dept Mat Sci & Engn, Hamilton, ON, Canada

[4] Max Planck Inst Eisenforsch GmbH, Dusseldorf, Germany

[5] Univ Texas El Paso, Dept Met Mat & Biomed Engn, El Paso, TX 79968 USA

来源：

SCRIPTA MATERIALIA | 2017年 / 139卷

关键词：

Atom probe tomography; Elemental distribution; M-A constituent; Heat-affected zone; C/Mn enrichment; LOW-ALLOY STEEL; ATOM-PROBE TOMOGRAPHY; M-A CONSTITUENT; PHASE-TRANSFORMATION; CLEAVAGE FRACTURE; TOUGHNESS; SEGREGATION; INITIATION; JOINT;

D O I：

10.1016/j.scriptamat.2017.06.017

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 (0.49 wt%) and Mn (2.32 wt%) 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 (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：67 / 70

页数：4

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