Characterization of Anisotropy of Strength in API-X80 Line Pipe Welds Through Instrumented Indentation

被引：6

作者：

Midawi, A. R. H. ^{[1
,3
]}

Huda, N. ^{[1
]}

Simha, C. H. M. ^{[2
]}

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

机构：

[1] Univ Waterloo, Ctr Adv Mat Joining CAMJ, Dept Mech & Mechatron Engn, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada

[2] Univ Guelph, Sch Engn, Guelph, ON N1G 2W1, Canada

[3] Univ Benghazi, Dept Mech Engn, Fac Engn, Benghazi 21861, Libya

来源：

METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS | 2020年 / 9卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Pipeline Weld; X80; Yield strength; Anisotropy; DIC; Weld metal microstructure; STRESS-STRAIN CURVES; SPHERICAL INDENTATION; YIELD STRENGTH; STEELS; HARDNESS; METALS;

D O I：

10.1007/s13632-020-00693-8

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In this work, an instrumented indentation technique with a nearly flat tip indenter was used to measure the yield strength of API-X80 line pipe weld. Using this technique, the yield strength can be estimated directly from the indentation load-displacement response. The yield strength of the weld metal was measured in the transverse (hoop) and longitudinal (long) directions of the weld, and the results indicated that the weld metal exhibits anisotropy in terms of the yield strength by as much as 100 MPa, which could lead to a non-conservative estimate when strength mismatch is considered. Conventional tensile testing obtained strength values to within 4.6% of the indentation measurements and confirmed the results. Hardness maps also show a 20 HV0.5 difference in the two directions of the weld, which supports anisotropy of yield strength. The microstructure analysis using SEM reveals a slight difference in the grain size, which partially explains the differences in properties.

引用

页码：884 / 894

页数：11