Microstructures and mechanical properties in two X80 weld metals produced using similar heat input

被引：40

作者：

Midawi, A. R. H. ^{[1
]}

Santos, E. B. F. ^{[2
]}

Huda, N. ^{[1
]}

Sinha, A. K. ^{[1
]}

Lazor, R. ^{[3
]}

Gerlich, A. P. ^{[1
]}

机构：

[1] Univ Waterloo, Dept Mech & Mechatron Engn, Ctr Adv Mat Joining, Waterloo, ON N2L 3G1, Canada

[2] Fed Univ Para UFPA, Fac Mech Engn FEM, Lab Mat Characterizat LCAM, BR-66075110 Belem, Para, Brazil

[3] TransCanada PipeLines, Dept Mat Engn, Calgary, AB, Canada

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2015年 / 226卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

GMAW consumables; X80; linepipe; Tensile strength; Impact toughness; TOUGHNESS; TITANIUM; DEPOSITS; STEELS;

D O I：

10.1016/j.jmatprotec.2015.07.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two welding consumables suitable for joining X80 linepipe steel are compared in terms of weld metal microstructures, hardness, impact toughness, and tensile properties. The chemical compositions of the consumables were similar, where one of the consumables had a rich wire chemistry containing higher C, Ni, Ti alloying additions compared to a lean one. Beads on plate welding were performed using the gas metal arc welding (GMAW) process set to achieve the same heat input of 0.66 kJ/mm. The results revealed that for both wires the weld metal microstructure was mainly consist of acicular ferrite. The consumable with richer chemistry (C, Ni and Ti) exhibited higher strength and hardness due to its finer final weld metal microstructure; however, Charpy impact tests results revealed the lean chemistry wire had higher toughness at low temperature. Since both weld metals exhibited similar acicular ferrite structures, the lower toughness of the richer chemistry weld was attributed to the presence of titanium inclusions which may provide crack initiation sites. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：272 / 279

页数：8

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