Sage Journals: Discover world-class research

Abstract

A novel testing technique has been employed to study the creep properties of ferritic steel weldments under shear loading. The technique allows examination of microstructurally distinct regions, such as the type IV region of the heat-affected zone, in relative isolation from adjacent material. When results from the shear tests are compared with uniaxial data an appropriate stress for determining creep rupture under multi-axial loading may be deduced. The stress rupture behaviour of shear and uniaxial tests as a function of stress and temperature are consistent. It is suggested that this test technique deserves wider application for the examination of the creep properties of materials that are microstructurally inhomogeneous.

Keywords

creep deformation low alloy ferritic steel weldments shear loading type IV zone

Get full access to this article

View all access options for this article.

References

Shüller

H. J.

Hagn

Woitscheck

‘Cracks in the weld area of formed parts in superheated steam lines—material analysis’, Der Maschinenschaden, 1974, 1, 1–13.

Gooch

D. J.

Kimmins

S. T.

‘A study of type IV cracking in 1/2% CrMoV/2 1/4% CrMo weldments’, Proceedings of 3rd International Conference on

Creep and Fracture of Engineering Materials and Structures, 1987, pp. 689–703.

Burke

P. R.

Howe

A. A.

‘Creep rupture properties of welded 1/2% CrMoV steels with additions of titanium and two levels of phosphorus’, Proceedings of 4th International Conference on

Creep and Fracture of Engineering Materials and Structures, 1990, pp. 635–650.

Henderson

Ferguson

F. R.

‘Determination of the multiaxial stress creep fracture criterion using a modified tensile creep unit’, Metals Technol., 1977, 4 (6), 296–300.

Hayhurst

D. R.

Webster

G. A.

‘An overview of studies of stress state effects during creep of circumferentially notched bars’, in

Techniques for Multiaxial Creep Testing, edited by D. J. Gooch and I. M. How, 1986 (Elsevier Applied Science, London), pp. 137–176.

ISO/DATA 1–1978 (E), Summary of average stress rupture properties of wrought steels for boiler and pressure vessels, 1978 International Standards Organization (ISO).

Hayhurst

D. R.

‘Creep rupture under multi-axial states of stress’, J. Mech. Phys. Solids, 1972, 20, 381–390.

Arnswald

Blum

Neubauer

Poulsen

K. E.

‘Remaining life affected by repair welds’, International Conference on

Creep, Tokyo, 14–18 April 1986, pp. 367–372.

Shron

R. Z.

Korman

A. I.

‘Evaluation of the supporting power of welds of steam pipes fabricated of Cr—Mo—V steels’, Thermal Engng (Teploenergetika (USSR)), 1975, 22 (10), 33–36.

10.

Dieter

G. E.

Mechanical Metallurgy, Third Edition, 1986 (McGraw-Hill, New York and London), pp. 189–191.

11.

Craine

R. E.

Hawkes

T. D.

‘On the creep of ferritic weldments containing multiple zones in plates under uniaxial loading’, J. Strain Analysis, 1993, 28 (4), 303–309.

12.

Kimmins

S. T.

Coleman

M. C.

Smith

D. J.

‘An overview of creep failure associated with heat affected zones of ferritic weldments’, Proceedings of 5th International Conference on

Creep and Fracture of Engineering Materials and Structures, 1993, pp. 681–694.

13.

Rice

J. R.

‘Constraints on the diffusive cavitation of isolated grain boundary facets in creeping polycrystals’, Acta Met., 1981, 29, 675–681.

14.

Lau

C. W.

Argon

A. S.

McClintock

F. A.

‘Stress concentrations due to grain boundary sliding in creeping alloys’, in

Elastic—Plastic Fracture: 2nd Symposium, Vol. I—Inelastic Crack Analysis, edited by C. F. Shih and J. P. Gudas, ASTM STP 803, 1983 (American Society for Testing and Materials, Philadelphia, Pa.), pp. I-551–I-572.

15.

Johnson

N. L.

Earthman

J. C.

‘Numerical model of primary creep deformation in novel double shear creep specimen’, J. Testing and Evaluation, 1994, 22 (2), 111–116.

Creep deformation and rupture of low alloy ferritic weldments under shear loading

Abstract

Abstract

Keywords

Get full access to this article

References