Acta Metall Sin  1993, Vol. 29 Issue (2): 31-36    DOI:

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MECHANICAL PROPERTIES AND б-PHASE EMBRITTLEMENT IN A FERRITE-AUSTENITE STAINLESS STEEL AT ELEVATED TEMPERATURES

WU Tiyan;WU Qibai;Y. Riquier Central-South University of Technology; Changsha; Faculte Polytechnique de Mons; Belgium

WU Tiyan;WU Qibai;Y. Riquier Central-South University of Technology; Changsha; Faculte Polytechnique de Mons; Belgium. MECHANICAL PROPERTIES AND б-PHASE EMBRITTLEMENT IN A FERRITE-AUSTENITE STAINLESS STEEL AT ELEVATED TEMPERATURES. Acta Metall Sin, 1993, 29(2): 31-36.

Abstract References Related Articles Recommended Metrics Download:  PDF(2141KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The mechanical properties of a ferritic-austenitic duplex stainless steel has beeninvestigated in the temperature range between 600 to 1100℃. The variation of ductilityagainst temperature has a minimum at 800--900℃. While at about 600℃ ferrite deformedcooperatively with austenite. With increasing temperature the coordination decreased. Evenat 1100℃ ferrite dominated the deformation process. The kinetics of σ-phase precipitationand the effect of σ-phase on tensile properties have also been revealed. The ductility of spec-imens deformed at about 600℃ was largely reduced by σ-phase and the effects of σ-phaseincreased with increasing σ-phase fraction but exhibit significant temperature dependence.When a specimen consisting of 16% σ-phase was tested at 900℃, σ-phase particle bandswere realigned parallel to the shearinng directions. Final fracture was preceded by plasticdeformation. At about 1000℃ the effect of σ-phase precipitation on tensile properties disap-peared, while fine dispersion of secondary austenite within ferrite strengthened the materialslightly. Key words:  duplex stainless steel      σ-phase      mechanical property      Received:  18 February 1993      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1993/V29/I2/31 1 Hayden H W, Floreen S. Metall Trans, 1973; 4A: 561 2 Maehara Y, Ohmori Y, Kunitake T. Met Technol, 1983; 10: 296 3 Maehara Y, Koike M, Fujino N, Kunitake T. Trans Iron Steel Inst Jpn, 1983; 23: 240 4 Beetge F G E, Robinson F P A. Met Mater, 1973; 7 (9) 408 5 DeBold T A. J Met, 1989; 41 (3) : 12 6 Norstrom L A, Pettersson S, Nordin S. Z Werkstofftech, 1981; 23: 229 [1] ZHANG Jian, WANG Li, XIE Guang, WANG Dong, SHEN Jian, LU Yuzhang, HUANG Yaqi, LI Yawei. 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