The use of duplex stainless steel increases steadily worldwide and the fluctuations in nickel price the recent years have contributed to further growth. The lean duplex grade Outokumpu LDX 2101 (EN 1.4162, UNS S32101) has low nickel content and is alloyed with nitrogen and manganese to give a balanced microstructure. It means that good austenite formation is obtained even when laser welding autogenously (without filler). This is in contrast to most other duplex grades, for which laser welding is normally associated with high ferrite fractions known to reduce the ductility and corrosion performance. Laser welding of LDX 2101 has been performed with and without filler wire, and laser hybrid welding with gas tungsten arc (GTA) and gas metal arc (GMA) using Nd:YAG, CO2 and fiber lasers. The microstructure is evaluated and compared with the corrosion performance, and the mechanical properties are presented.
REFERENCES
1.
McPherson
, N.A.
, Samson
, H.
, Baker
, T.N.
& Suarez-Fernandez
, N.
(2003
) Steel microstructures in autogenous laser welds
, Journal of Laser Applications
15
, 200
–210
.2.
Hsieh
, R.-I.
, Liou
, H.-Y.
& Pan
, Y.-T.
(1999
) Weldability of 22% Cr duplex stainless steels
, China Steel Technical Report
13
, 14
–26
.3.
Omura
, T.
, Kushida
, T.
& Kumizo
, Y.
(2000
) Microstructural features and corrosion properties in laser welded duplex stainless steels
, Welding International
14
, 257
–260
.4.
Jargelius-Pettersson
, R.F.A.
, Hertzman
, S.
, Szakalos
, P.
& Ferreira
, P.J.
(1994
) The influence of microstructure on pitting corrosion in autogenous TIG duplex stainless steel welds
, in Proceedings of Duplex Stainless Steels ’94
, Glasgow, Scotland
, Ed. T.G.
Gooch
, TWI 1995, Paper 37
, 12
pp.5.
Tamaki
, K.
, Yasuda
, K.
& Kimura
, M.
(1989
) Corrosion performance of girth-weld joints of duplex stainless steels
, Corrosion
45
, 764
–770
.6.
Hoffmeister
, H.
& Lothongkum
, G.
(1994
) Quantitative effects of nitrogen contents and cooling cycles on δ−γ transformation, chromium nitride precipitation and pitting corrosion after weld simulation of duplex stainless steels
, in Proceedings of Duplex Stainless Steels ’94
, Glasgow, Scotland
, Ed. T.G.
Gooch
, TWI
1995, Paper 55, 12
pp.7.
Gooch
, T.G.
& Ginn
, B.J.
(1997
) Properties of resistance and laser welds in UNS S32304 duplex stainless steel, in
Proceedings of Duplex Stainless Steels ’97
, Maastricht, The Netherlands, Zutphen
: KCI Publishing
, 311
–319
.8.
Baughn
, K.
, Ahmed
, N.
, Jarvis
, L.
& Viano
, D.
(2002
) Tailoring the phase balance during laser and GTA keyhole welding of SAF 2205 duplex stainless steel, in
Proceedings of 6th International Conference: Trends in Welding Research
, Pine Mountain, GA, USA
, ASM International
2003, 11
–16
.9.
Borggreen
, K.
, Kristensen
, J.K.
, Hansen
, L.E.
, Kocak
, M.
& Dos
Santos
, J.F. (1999
) Laser welding of heavy section duplex stainless steel grade 2205
, in Proceedings of Stainless Steel World ’99
, The Hague, The Netherlands, Zutphen
: KCI Publishing
, 267
–274
.10.
Wu
, H.C.
, Tsay
, L.W.
& Chen
, C.
(2004
) Laser beam welding of 2205 duplex stainless steel with metal powder additions
, ISIJ International
44
, 1720
–1726
.11.
Steffens
, H.-D.
, Wilden
, J.
& Honekamp
, E.
(1997
) Corrosion resistance and mechanical properties of laser beam welded duplex stainless steel
, in Proceedings of JOM-8; The International Conference on the Joining of Materials
, Helsingor, Denmark
, Ingeniorhojskolen Helsingor Teknikum
, 600
–605
.12.
Westin
, E.M.
, Keehan
, E.
, Ström
, M.
& von Brömssen
, B.
(2007
) Laser welding of a lean duplex stainless steel
, in Proceedings of ICALEO 2007
, Orlando, FL, USA
, Laser Institute of America
; 2007. Paper no. 609, pp. 335
–344
.13.
Westin
, E.M.
(2008
) Corrosion resistance of welded lean duplex stainless steel
, in Proceedings of Stainless Steel World America 2008
, Houston, Tx, USA, Zutphen
: KCI publishing
, Paper PS08025, 17
pp.14.
Westin
, E.M.
, Stelling
, K.
& Gumenyuk
, A.
, (2008
) Single-pass laser GMA hybrid welding of 13.5 mm thick duplex stainless steel, IIW document IV-963-08
, Submitted to Welding in the World
, 13
pp.15.
Qvarfort
, R.
(1988
) New electrochemical cell for pitting corrosion testing
, Corrosion Science
28
, 135
–140
.16.
Qvarfort
, R.
(1989
) Critical pitting temperature measurements of stainless steels with an improved electrochemical method
, Corrosion Science
29
, 987
–993
.17.
Rahoi
, D.W.
, Liljas
, M.
, Qvarfort
, R.
, Davison
, R.M.
& Gemmel
, G.
(1987
) Improved weldments for alloy 2205
, in Proceedings of Corrosion 87, NACE
, Houston, Tx, USA
, Paper 307, 17
pp.18.
Miura
, M.
, Koso
, M.
, Kudo
, T.
& Tsuge
, H.
(1989
) The effects of nickel and nitrogen on the microstructure and corrosion resistance of duplex stainless steel weldments
, Welding International
7
, 200
–206
.19.
Bonnefois
, B.
, Soulignac
, P.
& Charles
, J.
(1991
) Some aspects of nitrogen introduction in duplex weld pool
, in Proceedings of Duplex Stainless Steel ’91
, Beaune, France
, Les Editions de. Physique
, 469
–478
.20.
Vilpas
, M.
& Hänninen
, H.
(1999
) The role of nitrogen in improving pitting corrosion resistance of high-alloyed austenitic and duplex stainless steel welds
, Materials Science Forum 318-320
, 603
–608
.21.
Matsunaga
, H.
, Sato
, Y.S.
, Kokawa
, H.
& Kuwana
, T.
(1996
) Effect of nitrogen on corrosion of duplex stainless steel weld metal
, Science and Technology of Welding and Joining
3
, 225
–232
.22.
Khan
, P.A.A.
, DebRoy
, T.
& David
, S.A.
(1988
) Laser beam welding of high-manganese stainless steels–examination of alloying element loss and microstructural changes
, Welding Journal
67
, 1s
–7s
.23.
Fellman
, A.
& Westin
, E.M.
(2008
) Fiber laser hybrid welding of stainless steel
, in Proceedings of ICALEO 2008
, Temecula, CA, USA
, Laser Institute of America
, 2008, Paper 1204, 8
pp.
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