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| THE PHASE TRANSFORMATION OF δ-FERRITE IN A STRUCTURALLY DUPLEX IRON-ALUMINIUM-MANGANESE-MOLYBDENUM ALLOY |
| CHANG SHOU-HUA; YEH T'IEN-T'IEN (Peking Institute of Ferrous Metallurgy) |
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Cite this article:
CHANG SHOU-HUA; YEH T'IEN-T'IEN (Peking Institute of Ferrous Metallurgy). THE PHASE TRANSFORMATION OF δ-FERRITE IN A STRUCTURALLY DUPLEX IRON-ALUMINIUM-MANGANESE-MOLYBDENUM ALLOY. Acta Metall Sin, 1966, 9(2): 198-242.
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Abstract Austenite and δ-ferrite coexist after a solution treatment at 1100℃ in an Fe-Al-Mn-Mo alloy with a composition of 0.07% C, 4.6% Al, 32.5% Mn and 3.1% Mo. The processes of phase transformation in the temperature range 950—450℃ were studied metallographically and the transformation products were electrolytically extracted and examined. The curves for the beginning of isothermal transformation were determined metallographically.It has been found that δ→γ transformation occurs at temperatures between 950—750℃ and δ→γ + M_(23)C_6 transformation between 650—550℃. They proceed by a fully diffusive process and a bainitic process simultaneously in the respective temperature ranges. An intermetallic compound X phase of α-Mn structure corresponding to Fe_(26)Mn_(16)Mo_8Al_8 was found to precipitate from δ-ferrite at temperatures between 750—450℃.
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Received: 18 February 1966
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