Influence of post-weld heat treatment on tensile properties of modified 9Cr

Abstract

The paper presents the influence of post-weld heat treatment (PWHT) on tensile properties of modified 9Cr–1Mo ferritic steel base metal. Tensile tests at room and elevated temperatures (300–873 K) were performed on specimens in normalised and tempered condition as well as with additional PWHT (993 K for 1 h; 1013 K for 1 h and 1033 K for 1 h). The yield and ultimate tensile strengths decrease gradually up to intermediate temperatures followed by a rapid fall at high temperatures in all heat treatment conditions. At intermediate temperatures, the steel exhibited ductility minima, serrated flow, negative strain rate sensitivity on flow stress and peak in the average work hardening rate. The influence of additional PWHT is reflected in a systematic and gradual decrease in both the yield and tensile strength values with increasing PWHT temperature from 993 to 1033 K for 1 h. However, there has been no appreciable change in ductility values as well as the fracture mode in PWHT conditions compared with those observed in normalised and tempered condition. Comparison of strength values in PWHT conditions suggested that the strength values remained higher than the average values specified in the French Nuclear Design Code, RCC-MR.

Keywords

TENSILE PROPERTIES POST-WELD HEAT TREATMENT

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References

Sikka

V. K.

: Proc. AIME Topical Conf. on Terrific alloys for use in nuclear energy technologies’, (ed. Davies

J. W.

and Michel

D. J.

), 317-327; 1984, Warrendale, PA, AIME.

Masuyama

: in ‘Advanced heat resistant steels for power generation’ (ed. Viswanathan

and Nutting

), 33-47; 1999, London, The Institute of Materials.

Mannan

S. L.

, Chetal

S. C.

, Raj

and Bhoje

S. B.

: Trans. Ind. Inst. Met., 2003, 56, 155–178.

Kimura

, Kushima

, Abe

, Yagi

and Irie

: in ‘Advances in turbine materials, design and manufacturing’, (ed. Strang

et al), 257-269; 1997, London, The Institute of Materials.

Choudhary

B. K.

, Sakara Rao

K. B.

and Mannan

S. L.

: Mater. ScL Eng. A, 1991, A148, 267–278.

Klueh

R. L.

: Inter. Mater. Rev., 2005, 50, 287–310.

Shibli

I. A.

: Proc. 6th Int. Charles Parsons Turbine Conf. on ‘Engineering issues in turbine machinery, power plant and renew-ables’, (ed.

Strang

et al), 261-279; 2003, Dublin, Maney Publishers.

Raj

, Choudhary

B. K.

and Singh Raman

R. K.

: Int. J. Pres. Ves. Pip., 2004, 81, 521–534.

Laha

, Chandravathi

K. S.

, Sankara Rao

K. B.

and Mannan

S. L.

: Trans. Ind. Inst. Met., 2005, 58, 379–385.

10.

Masuyama

: Proc. 2nd Int. Conf. on ‘Integrity of high temperature welds’, 373-380; 2003, London, Institute of Materials, Minerals and Mining.

11.

Shinozaki

, Li

D. J.

, Harada

, Ohishi

and Sato

: ScL TechnoL Weld. Join., 203, 8,289–295.

12.

Chandravathi

K. S.

, Laha

, Sankara Rao

K. B.

and Mannan

S. L.

: Proc. 1st Int. Conf. on ‘Advanced structural steels’ Tsukuba, Japan, 2002, NIMS,167–168.

13.

Middleton

C. J.

, Brear

J. M.

, Munson

and Viswanathan

: Proc. 3rd Conf. on ‘Advances in materials technology for fossil power plants’, (ed. Viswanathan

et al), 69-78; 2001, London, The Institute of Metals.

14.

Matsui

, Tabuchi

, Watanabe

, Kubo

, Kinugawa

and Abe

: ISIJ Int. Suppl. 2001, 41, S126—S130.

15.

Albert

S. K.

, Matsui

, Watanabe

, Hongo

, Kubo

and Tabuchi

: Int. J. Pres. Ves. Pip., 2003, 80, 405–413.

16.

Albert

S. K.

, Kondo

, Tabuchi

, Yin

, K Sawada and F. Abe: MetalL Mater. Trans. A, 2005, 36A, 333–3423

17.

Olabi

and Hashmi

M. S. J.

: J. Mater. Process. TechnoL, 1996, 56, 88–97.

18.

Smith

, Pistorius

P. G. H.

and Wannenburg

: Int. J. Pres. Ves. Pip., 1997, 70, 183–195.

19.

Viswanathan

, Handy

and Findlan

: Power Eng., 1996, 100, 38.

20.

Alfonso, Fernandez Fuentes

and Alcantara

Nelson G.

: Mater. Sci. Eng. A, 2004, A371, 127–134.

21.

French Nuclear Design Code, RCC-MR: ‘Design and construction rules for mechanical components of FBR nuclear Islands’, RCC-MR, Section 1, Subsection Z, Appendix A3, 2002, 18S, A3•18S/1-26.

22.

Jordan

G. R.

, Andrews

S. J.

and Hippsley

C. A.

: Mater. ScL TechnoL, 1993,9, 1115–1121.

23.

Choudhary

B. K.

, Sankara Rao

K. B.

, Mannan

S. L.

and Kashyap

B. P.

: J. Nucl. Mater., 1999, 273, 315–325.

24.

Sleeswyk

A. W.

: Acta. MetalL, 1960, 8, 130–132.

25.

Keh

A. S.

, Nakada

and Leslie

W. C.

: ‘Dislocation dynamics’, (ed. Rosenfield

A. R.

et al), 381-408; 1968, New York, McGraw Hill.

26.

McCormick

P. G.

: Acta MetalL, 1973, 21, 351–354.

27.

Choudhary

B. K.

, Sankara Rao

K. B.

, Mannan

S. L.

and B. P.

28.

Sanderson

S. J.

and Jaques

: Proc. IAEA Specialist Meet. on

29.

Choudhary

B. K.

, Sankara Rao

K. B.

and Mannan

S. L.

: Int. J.

30.

Rodriguez

: ‘Encyclopedia of materials science and engineering supplementary’, (ed. Cahn

R. W.

), Vol. 1, 504-508; 1988, Oxford, Pergamon Press.

31.

Barnby

J. T.

: J. Iron Steel Inst., 1965, 203, 293–297.

32.

Michel

D. J.

, Moteff

and Lorell

A. J.

: Acta Metall., 1973, 21, 1267–1277.

33.

Mannan

S. L.

, Samuel

K. G.

and Rodriguez

: Mater. Sci. Eng. A, 1984, A68, 143–149.

34.

Brinkman

C. R.

, Gieseke

and Maziasz

P. J.

: Proc. 1st Int. Conf. on ‘Microstrucure and mechanical properties of aging materials’, (ed. Liaw

P. K.

et al), 107-115; 1993, Warrendale, PA, TMS.

35.

Gieseke

, Brinkman

C. R.

and Maziasz

P. J.

: Proc. 1st Int. Conf. on ‘Microstrucure and mechanical properties of aging materials’, (ed. Liaw

P. K.

et al), 197-205; 1993, Warrendale, PA, TMS.

Influence of post-weld heat treatment on tensile properties of modified 9Cr–1Mo ferritic steel base metal

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