Effect of Nb on Mechanical Properties of HAZ for High-Nb X80 Pipeline Steels

被引：0

作者：

CHEN Xiao-wei ^{[1
,2
]}

LIAO Bo ^{[1
]}

QIAO Gui-ying ^{[3
]}

GU Yu ^{[1
]}

WANG Xu ^{[1
,2
]}

XIAO Fu-ren ^{[1
]}

机构：

[1] Key Laboratory of Metastable Materials Science and Technology,College of Materials Science and Engineering, Yanshan University

[2] CNPC Bohai Equipment Manufacturing Co.,Ltd.

[3] School of Environmental and Chemical Engineering,Yanshan University

来源：

JournalofIronandSteelResearch(International) | 2013年 / 20卷 / 12期

基金：

中国国家自然科学基金;

关键词：

high-Nb X80grade pipeline steel; welding thermal cycle; HAZ; microstructure; mechanical property;

D O I：

10.13228/j.boyuan.issn1006-706x.2013.12.005

中图分类号：

TG142.4 [各种钢材：按用途区分];

学科分类号：

080502 ;

摘要：

The mechanical properties of heat affected zone(HAZ)of two commercial high-Nb X80grade pipeline steels with different alloy elements were investigated using thermal simulation performed on a Gleeble-3500thermal simulator.The results showed that the high-Nb steels have excellent weldability.Embrittlement regions appear in coarse grain heat affected zone(CGHAZ)and intercritically heat affected zone(ICHAZ);Softening region appears in fine-grain heat affected zone(FGHAZ),and the strength here was even lower than 555 MPa as required in the standard.Meanwhile,with the increase of heat input,the strength and the toughness of HAZ of steel with high Nb,C and lower alloy decrease notably.Therefore,take into account the welding procedure during manufacture of weld pipe,suitable amount of alloy elements,such as Cr,Ni,Cu,Mo and so on,is necessary for high Nb X80heavythick steel plate.

引用

页码：53 / 60

页数：8

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