Sage Journals: Discover world-class research

Abstract

The effects of increasing the nickel content from 3 to 7 or 9 wt-% were investigated in high strength steel weld metals with 2 wt-% manganese. Nickel additions were beneficial to strength but detrimental to impact toughness. Significant segregation of nickel and manganese to interdendritic regions was observed at the two higher nickel contents. In these weld metals a mainly martensitic microstructure developed at interdendritic regions, whereas bainite was found at dendrite core regions. The microstructural inhomogeneity was due to segregation and the accompanying stabilisation of austenite in solute enriched regions to lower transformation temperatures. With 3 wt-% nickel the microstructure was found to be more homogeneous, with mainly bainite forming. The decrease in impact toughness with increasing nickel content was mainly attributed to the formation of coarse grained coalesced bainite.

Keywords

NICKEL HIGH STRENGTH STEEL WELD METAL MANGANESE STRENGTH IMPACT TOUGHNESS SEGREGATION MARTENSITE BAINITE MICROSTRUCTURE AUSTENITE TRANSFORMATION TEMPERATURE COALESCED BAINITE

Get full access to this article

View all access options for this article.

References

Widgery

D. J.

, Karlsson

, Murugananth

and Keehan

: ‘Approaches to the development of high strength weld metals’, Proc. 2nd Int. Symp. on ‘High strength steel’, Verdal, Norway, April 2002, SINTEF Materials Technology.

Wang

and Liu

: Weld. J., 2002, 81, (7), 132s.

Fairchild

D. P.

, Macia

M. L.

, Bangaru

N. V.

and Koo

J. Y.

: Proc. 13th Int. Offshore and Polar Eng. Conf., Honolulu, Hawaii, USA, May 2003, p. 26.

Svensson

L.-E.

: ‘Control of microstructure and properties in steel arc welds’, 69; 1994, Boca Raton, FL, USA, CRC Press.

Lampman

(tech. ed.): in ‘Weld integrity and performance’, 218; 1997, Materials Park, OH, USA, ASM International.

Murugananth

, Bhadeshia

H. K. D. H.

, Keehan

, Andrén

H. O.

and Karlsson

: ‘Strong and tough ferritic steel welds’, in ‘Mathematical modelling of weld phenomena 6’, (ed. H. Cerjak), 205–230; 2002, Abington, Woodhead.

Kang

, Kim

H. J.

and Hwang

S. K.

: ISIJInt., December 2000, 40, 1237.

Zhang

and Farrar

R. A.

: Weld

., 1997, 76, (5), 183s–196s.

Keehan

: PhD thesis, Paper 7, Chalmers University of Technology, Gothenburg, Sweden, 2004.

10.

Keehan

: PhD thesis, Paper 3, Chalmers University of Technology, Gothenburg, Sweden, 2004.

11.

Keehan

, Karlsson

, Andren

H. O.

and Bhadeshia

H. K. D. H.

: Sci. Technol. Weld. Joining, 2006, 11, (1), 9–18.

12.

Keehan

, Karlsson

, Andren

H. O.

and Bhadeshia

H. K. D. H.

: Sci. Technol. Weld. Joining, 2006, 11, (1), 19–24.

13.

‘Welding consumables – covered electrodes for manual metal arc welding of non alloy and fine grain steels – classification’, DIN Standard ISO 2560: 2002.

14.

‘WeldCalc’ software, Version 1.0.0, SSAB, Oxelösund, Sweden, 1998–1999.

15.

‘Charpy impact test on metallic materials; part 1: test method’, DIN Standard EN 10045–1: 1991.

16.

Lord

: Weld. World, 1998, 41, 452.

17.

Lord

: ‘Design and modelling of ultra-high strength steel weld deposits’, PhD thesis, University of Cambridge, Cambridge, UK, 1999.

18.

Andrews

K. W.

, Dyson

D. J.

and Keown

S. R.

: ‘Interpretation of electron diffraction patterns’, 2nd edn; 1971, London, Adam Hilger.

19.

Edington

J. W.

: ‘Practical electron microscopy in material science’, 118; 1975, London, The Macmillan Press.

20.

Internet http://cimesg1.epfl.ch/CIOL/ems.html, Centre Inter disciplinaire de Microscopie Electronique, Ecole Polytechnique Federale de Lausanne, Lausanne, France.

Influence of carbon,manganese and nickel on microstructure and properties of strong steel weld metals: Part 1 – Effect of nickel content

Abstract

Keywords

Get full access to this article

References