Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

被引：99
|
作者：
Huda, Nazmul [1 ]
Midawi, Abdelbaset R. H. [1 ]
Gianetto, James [2 ]
Lazor, Robert [3 ]
Gerlich, Adrian P. [1 ]
机构：
[1] Univ Waterloo, Dept Mech & Mechatron Engn, CAMJ, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada
[2] Nat Resources, CanmetMAT, Hamilton, ON L8P 0A5, Canada
[3] TransCanada Pipelines Ltd, Calgary, AB T2P 5H1, Canada
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 662卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
X80; Linepipe; MA; Cooling rate; Mechanical properties; HEAT-AFFECTED ZONE; LOW-ALLOY STEEL; STRUCTURE-PROPERTY RELATIONSHIPS; CLEAVAGE FRACTURE INITIATION; CARBON MICROALLOYED STEELS; ARC WELDING PROCESS; DUAL-PHASE STEELS; HSLA STEEL; MECHANICAL-PROPERTIES; CHEMICAL-COMPOSITION;
D O I：
10.1016/j.msea.2016.03.095
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Varying cooling rates are used to investigate the influence of martensite-austenite (MA) microconstituent on the mechanical properties of X80 linepipe steel after intercritical reheating. It is shown that air and water cooling forms MA, while furnace cooling does not. The increase in cooling rate decreases carbon diffusion to promote MA during air or water cooling. Faster cooling using water results in a change of MA morphology from slender to blocky. Both water and air cooled samples exhibit poor impact toughness in comparison to furnace cooling, with lower Charpy impact toughness occurring with a high percentage of blocky MA following water quenching. It is shown that MA deteriorates toughness by facilitating de bonding, cracking and crack initiation during impact testing. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：481 / 491
页数：11
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