Characterisation of grain boundary cluster compactness in austenitic stainless steel

Abstract

The distribution of grain boundaries of particular crystallographic character can provide descriptive information on the properties of engineering materials. For example, the fraction and connectivity of corrosion susceptible grain boundaries typically correlates with the extent of intergranular corrosion and stress corrosion cracking resistance in sensitised austenitic stainless steels. A parameter defining the cluster compactness is proposed to describe the breakup of the network of corrosion susceptible grain boundaries. It may therefore provide a measure of intergranular stress corrosion cracking resistance. The cluster compactness of the network of random grain boundaries (>Σ29) in electron backscatter diffraction assessments of microstructure is shown to decrease with increasing fraction of Σ3 boundaries. However, the cluster compactness of the network of corroded grain boundaries identified after electrochemical testing is less sensitive to changes in microstructure obtained by thermomechanical processing.

Keywords

CLUSTER CHARACTERISTICS GRAIN BOUNDARY ENGINEERING SENSITISATION STAINLESS STEEL ELECTRON BACKSCATTER DIFFRACTION

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References

Lehockey

E. M.

, Palumbo

, Lin

and Brennenstuhl

A. M.

: ‘On the relationship between grain boundary character distribution and intergranular corrosion’, Scr. Mater., 1997, 36, (10), 1211–1218.

Tsurekawa

, Nakamichi

and Watanabe

: ‘Correlation of grain boundary connectivity with grain boundary character distribution in austenitic stainless steel’, Acta Mater., 2006, 54, 3617–3626.

Babout

, Marrow

T. J.

, Engelberg

and Withers

P. J.

: ‘X-ray microtomographic observation of intergranular stress corrosion cracking in sensitised austenitic stainless steel’, Mater. Sci. Technol., 2006, 22, (9), 1068–1075.

Jivkov

A. P.

and Marrow

T. J.

: ‘Rates of intergranular environ-ment assisted cracking in three-dimensional model microstruc-tures’, Theor. Appl. Fract. Mech., 2007, 48, (3), 187–202.

King

, Johnson

, Engelberg

, Marrow

T. J.

and Ludwig

: ‘Observation of intergranular stress corrosion cracking in a grain-mapped polysrystal’, Science, 2008, 321, 382–385.

Grimmer

, Bollmann

and Warrington

D. H.

: ‘Coincidence-site lattices and complete pattern-shift lattices in cubic crystals’, Acta Crystallogr. A, 1974, 30A, 197–207.

Gertsman

V. Y.

and Bruemmer

S. M.

: ‘Study of grain boundary character along intergranular stress corrosion crack paths in austenitic alloys’, Acta Mater., 2001, 49, 1589–1598.

Thou

, Aust

K. T.

, Erb

and Palumbo

: ‘Effects of grain boundary structure on carbide precipitation in 304L stainless steel’, Scr. Mater., 2001, 45, (1), 49–54.

Rahimi

, Engelberg

D. L.

, Duff

J. A.

and Marrow

T. J.

: ‘In situ observation of intergranular crack nucleation in a grain boundary controlled austenitic stainless steel’, J. Microsc., 2009, 233, (3), 423–431.

10.

Kokawa

, Shimada

and Sato

Y. S.

: ‘Grain-boundary structure and precipitation in sensitized austenitic stainless steels’, J. Miner. Metals Mater. Soc., 2000, 52, (7), 34–37.

11.

Gertsman

V. Y.

and Henager

C. H.

Jr : Grain boundary junctions in microstructure generated by multiple twinning’, Interf Sci, 2003, 11, 403–415.

12.

Engelberg

D. L.

, Humphreys

F. J.

and Marrow

T. J.

: ‘The influence of low-strain thermo-mechanical processing on grain boundary network characteristics in type 304 austenitic stainless steel’, J. Microsc., 2008, 230, (3), 435444.

13.

Basinger

J. A.

, Homer

E. R.

, Fullwood

D. T.

and Adams

B. L.

: ‘Two-dimensional grain boundary percolation in alloy 304 stainless steel’, Scr. Mater., 2005, 53, 959–963.

14.

Frary

and Schuh

C. A.

: ‘Grain boundary networks: scaling laws, preferred cluster structure, and their implications for grain boundary engineering’, Acta Mater., 2005, 53, 4323–4335.

15.

Schuh

C. A.

, Kumar

and King

W. E.

: ‘Analysis of grain boundary networks and their evolution during grain boundary engineering’, Acta Mater., 2003, 51, 687–700.

16.

Reed

B. W.

and Kumar

: ‘Mathematical methods for analyzing highly-twinned grain boundary networks’, Scr. Mater., 2006, 54, 1029–1033.

17.

Reed

B. W.

, Kumar

, Minich

R. W.

and Rudd

R. E.

: ‘Fracture roughness scaling and its correlation with grain boundary network structure’, Acta Mater., 2008, 56, 3278–3289.

18.

Engelberg

D. L.

, Rahimi

and Marrow

T. J.

: ‘Towards understanding the development of grain boundary clusters in austenitic stainless steel’, Proc. Conf. Thermec 2009, Berlin, Germany, August 2009, Technical University-Berlin.

19.

Humphreys

F. J.

: ‘Vmap—orientation mapping and quantitative metallography by EBSD'; 2001, Manchester, University of Manchester.

20.

Brandon

D. G.

: ‘The structure of high-angle grain boundaries’, Acta Metal., 1966, 14, 1479–1484.

21.

‘Corrosion of metals and alloys—electrochemical potentiokinetic reactivation measurement using the double loop method (based on Cihal's method)’, ISO 12732:2006, ISO, Geneva, Switzerland, 2006.

22.

Majidi

A. P.

and Streicher

M. A.

: ‘The double loop reactivation method for detecting sensitization in AISI 304 stainless steel’, Corrosion, 1984, 40, (11), 584–593.