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| MICROSTRUCTURAL STABILITY AND ITS INFLUENCE ON EMBRITTLEMENT OF FERRITIC-AUSTENITIC STAINLESS STEEL 00Cr18NiSMo3Si2 |
| Wu Jiu; Chen Rongxian; Li Xueyuan; Lu Jinsheng; Ji Shaohua; Huo Shuyun; Li Diankun (Central Iron and Steel Researeh Institute; Ministry of Metallurgical Industry; Beijing) |
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Cite this article:
Wu Jiu; Chen Rongxian; Li Xueyuan; Lu Jinsheng; Ji Shaohua; Huo Shuyun; Li Diankun (Central Iron and Steel Researeh Institute; Ministry of Metallurgical Industry; Beijing). MICROSTRUCTURAL STABILITY AND ITS INFLUENCE ON EMBRITTLEMENT OF FERRITIC-AUSTENITIC STAINLESS STEEL 00Cr18NiSMo3Si2. Acta Metall Sin, 1982, 18(1): 95-137.
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Abstract The influence of the microstructural stability on the embrittlement in ferriticaustenitic stainless steel, 00Crl8Ni5Mo3Si2, was investigated. After solution treated at 980℃ and subsequently aged between 450—900℃, the steel has undergone two types of transformations, namely α→γ'+χ(σ) and α→α'+precipitates of intermetallic phases. During aging in temperature range of 450—750℃, the lamellar intermetallic phases Fe_3Cr_3Mo_2Si_2 precipitates preferentially along grain boundaries and a topological close packed phase Fe_(2.4)Cr_(1.3)MoSi (R phase) appears in the ferrite grains, while in 750—900℃ the χ phase is merely a metastable one which changes easily to σ phase. A study was also made of the kinetic curve of isothermal decompcsition of α-ferrite. The results indicated that the fracture feature of the steel between 550—650℃ is quite different from that between 800—900℃. In the range of 550—650℃, the intergranular brittle fracture is caused substantially by the precipitation of the lamellari ntermetallic phase Fe_3Cr_3Mo_2Si_2 arranged regularly along grain boundaries, but in 800—900℃, thequasicleavage fracture is connected with the lumpy precipitates of σ and χ phases.
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Received: 18 January 1982
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