Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 5    No. 2    June 1995

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PHASE DIAGRAMS AND σ- PHASE PRECIPITATION IN SOME STAINLESS STEELS
Pan Yong; Qiu Caian

Xiangtan University; Xiangtan 411105

Abstract:Phase diagrams of the Fe-Cr-Ni system have been calculated in order to examine the sigma(σ)phase composition range and its stability. Calculation indicates that σ phase starts to precipitate at 977℃ and then disappears after the invariant reaction γ+σ→α12 occurs at 464℃. Here α1and α2 represent Fe-rich and Cr-rich ferrites respectively. Particularly, effect of Cr and Ni contents on the σ precipitation in the 18-8 type stainless steels was formulated by the present calculation. The a precipitation was also examined in a super duplex stainless steel Fe-25 Cr-7. 2 Ni-3. 6 Mo-0. 25 N (wt. -%), and calculated phase diagram shows that the σ precipitation takes place only when annealing this steel at temperature below 920℃. The addition of nitrogen content up to 0.6 wt. -% can not prevent the σ precipitation in such steel.

 

Key words: Fe-Cr-Ni phase diagram σ-phase precipitation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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