Sage Journals: Discover world-class research

Abstract

In this study, the precipitation of boron nitride (BN) on creep cavity surfaces during creep and its beneficial effect on the creep rupture properties are reported for a type 304 austenitic stainless steel. In the conventional 304 stainless steel, the trace of soluble S segregates strongly on the creep cavity surfaces and promotes its growth during creep. In the modified 304 stainless steel added with B, Ce, and Ti, the trace of soluble S is removed effectively by the formation of Ce and Ti sulfides, and the segregation of S on the creep cavity surface is replaced by the precipitation of the BN compound. As BN is very stable at high temperatures, its precipitation on the cavity surface is expected to suppress the creep cavity growth rate. It is suggested that the precipitation of BN on the creep cavity surface provides austenitic stainless steel with the function of self-healing for creep cavitation with an associated increase in the creep rupture strength and ductility.

Keywords

self-healing creep damage stainless steel creep cavity surface precipitation boron nitride rupture properties

Get full access to this article

View all access options for this article.

References

Cosandey, F. , Li, D. , Sczerzenie, F. and Tien, J.K. 1983. “The Effect of Cerium on High Temperature Tensile and Creep Behavior of a Superalloy” , Metall. Trans. A, 14A: 611–621 .

Evans, H.E. 1984. Mechanisms of Creep Fracture, Elsevier Applied Science Publishers, The Netherlands .

Holt, R.T. and Wallace, W. 1976. “Impurities and Trace Elements in Nickel-base Superalloys” , Int. Met. Rev., 21: 1–24 .

Hua, M. , Garcia, C.J. and DeArdo, A.J. 1993. “Multiphase Precipitates in Interstitial-free Steels” , Scr. Metall., 28: 973–978 .

Laha, K. , Kyono, J. , Sasaki, T. , Kishimoto, S. and Shinya, N. 2005a. “Improved Creep Strength and Creep Ductility of Type 347 Austenitic Stainless Steel through the Self-healing Effect of Boron for Creep Cavitation” , Metall. Mater. Trans. A, 36A: 399–409 .

Laha, K. , Kyono, J. , Kishimoto, S. and Shinya, N. 2005b. “Beneficial Effect of B Segregation on Creep Cavitation in a Type 347 Austenitic Stainless Steel” , Scr. Metall. Mater., 52: 675–678 .

Nii, K. and Yoshihara, K. 1987. “Surface Precipitation and its Applications to Coatings” , J. Mat. Eng., 9: 41–50 .

Nix, W.D. , Yu, K.S. and Wang, J.S. 1983. “The Effect of Segregation on the Kinetics of Intergranular Cavity Growth under Creep Conditions” , Metall. Trans. A, 14A: 563–570 .

Rhead, G.E. 1975. “Diffusion on Surfaces” , Surf. Sci., 47: 207–221 .

10.

Shinya, N. and Keown, S.R. 1979. “Correlation between Rupture Ductility and Cavitation” , Met. Sci., 13: 89–93 .

11.

Stulen, R.H. and Bastasz, R. 1979. “Surface Segregation of Boron in Nitrogen-strengthened Stainless Steel” , J. Vac. Sci. Technol., 16: 940–945 .

12.

Swindeman, R.W. , Sikka, U.K. and Klueh, R.L. 1983. “Residual and Trace Element Effect on the High-temperature Creep Strength of Austenitic Stainless Steels” , Metall. Trans. A, 14A: 581–593 .

13.

Viswanathan, R. 1985. “Dissimilar Metal Weld and Boiler Creep Damage Evaluation for Plant Life Extension” , J. Pre. Vess. Technol., 107: 218–225 .

14.

White, C.L. , Padgett, R.A. and Swindeman, R.W. 1981. “Sulfur and Phosphorus Segregation to Creep Cavities and Grain Boundaries in 304 SS” , Scr. Metall., 15: 777–782 .

15.

Yoo, M.H. and Trinkaus, H. 1983. “Crack and Cavity Nucleation at Interfaces during Creep” , Metall. Trans. A, 14A: 547–561 .

Self-healing Effect of Boron Nitride Precipitation on Creep Cavitation in Austenitic Stainless Steel

Abstract

Keywords

Get full access to this article

References