Structural Changes in a 9%Cr Creep Resistant Steel during Creep Test

Abstract:

Article Preview

Structural changes in a 9%Cr martensitic steel after 1%, 4% creep and creep rupture test at 650°C and stress of 118 MPa were examined. Heat treatment provided the formation of tempered martensite lath structure (TMLS) in the steel. The precipitations of second phase particles along block and lath boundaries provide effective stabilization of the TMSL under annealing/aging condition. This structure hardly changed under creep conditions in grip portion of crept sample. Significant coarsening of both the second phase particles and the martensite laths takes place in neck portion. In addition, the latter ones lose their original morphology and are replaced by large strain-induced subgrains. It should be noted that the increase of subgrain size is in almost direct proportion to the particle growth during the creep to 4% strain. The rapid growth of martesite laths followed by their evolution to deformation subgrains takes place within the tertiary creep regime.

Info:

Periodical:

Materials Science Forum (Volumes 715-716)

Edited by:

E.J. Palmiere and B.P. Wynne

Pages:

895-900

DOI:

10.4028/www.scientific.net/MSF.715-716.895

Citation:

V. Dudko et al., "Structural Changes in a 9%Cr Creep Resistant Steel during Creep Test", Materials Science Forum, Vols. 715-716, pp. 895-900, 2012

Online since:

April 2012

Export:

Price:

$38.00

[1] R.O. Kaibyshev, V.N. Skorobogatykh, I.A. Shchenkova: Phys. Metall. Met. Vol. 109 (2010) p.200.

[2] M. Taneike, F. Abe and K. Sawada: Nature Vol. 424 (2007) p.294.

[3] J. Hald: Int. Jnl. of Pressure Vessels and Piping Vol. 85 (2008) p.30.

[4] G. Gupta and G.S. Was: Metall. Mater. Trans. A Vol. 39A (2008) p.150.

[5] K. Sawada, M. Takeda, K. Maruyama et al.: Mater. Sci. Eng. A Vol. A267 (1999) p.19.

[6] F. Abe, T. Horiuchi, M. Taneike and K. Sawada: Mater. Sci. Eng. A Vol. A378 (2004) p.299.

[7] H.J. McQueen and J.J. Jonas: Treatise on Materials Science and Technology, edited by R.J. Arsenoult Academic Press, NY (1975) p.393.

[8] V. Dudko, A. Belyakov, V. Skorobogatykh, I. Shchenkova and R. Kaibyshev: Metal Science and Heat Treatment Vol. 4 (2010) in press.

[9] L. Korcakova, J. Hald, M. Somers: Materials Characterization Vol. 47 (2001) p.111.

[10] F. G. Wei, T. Hara, and Tsuzaki: Phil. Mag. Vol. 84 (2004) p.1735.

In order to see related information, you need to Login.