论文信息 - Creep-rupture behavior of 3Cr–3W–V bainitic steels

Creep-rupture behavior of 3Cr–3W–V bainitic steels

Abstract A nominally Fe–3.0Cr–3.0W–0.25 V (3Cr–3WV) steel and this composition with 0.07% Ta (3Cr–3WVTa) were developed for elevated-temperature service in the power-generation and petrochemical industries. Creep-rupture strengths of the new steels to 600 °C exceeded those of the two advanced commercial 2.25Cr steels T23 (Fe–2.25Cr–1.6W–0.25V–0.05Nb–0.07C) and T24 (Fe–2.25Cr–1.0Mo–0.25V–0.07Ti–0.005B–0.07C). Moreover, the strength of 3Cr–3WVTa approached that of modified 9Cr–1Mo (T91) at 650 °C. Elevated-temperature strength in the new steels is obtained from a bainitic microstructure with a high number density of fine needle-like MX precipitates in the matrix. The presence of tantalum promotes a finer MX precipitate in the 3Cr–3WVTa than in the 3Cr–3WV, and it suppresses the coarsening of these fine precipitates during creep.

[1] P. Maziasz,et al. The microstructure of chromium-tungsten steels , 1989 .

[2] Ronald L. Klueh,et al. Microstructure and mechanical properties of a 3Cr-1.5Mo steel , 1987, Metallurgical and Materials Transactions A.

[3] T. Noda,et al. Alloy composition selection for improving strength and toughness of reduced activation 9Cr-W steels , 1991 .

[4] Akira Kohyama,et al. R&D of low activation ferritic steels for fusion in japanese universities , 1994 .

[5] T. Kondo,et al. Phase stability of reduced activation ferritic steel: 8%Cr-2%W-0.2%V-0.04%Ta-Fe , 1988 .

[6] R. Viswanathan,et al. Materials for ultrasupercritical coal power plants—Boiler materials: Part 1 , 2001 .

[7] Masanori Yamazaki,et al. Charpy impact testing using miniature specimens and its application to the study of irradiation behavior of low-activation ferritic steels , 1991 .

[8] T. Kondo,et al. Accumulation of engineering data for practical use of reduced activation ferritic steel: 8%Cr2%W0.2%V0.04%TaFe , 1992 .

[9] G. J. Butterworth,et al. Comparison of transmutation and activation effects in five ferritic alloys and aisi 316 stainless steel in a fusion neutron spectrum , 1984 .