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| ISOTHERMAL STRUCTURAL DECOMPOSITION IN CERTAIN Mo-BEARING STAINLESS STEELS |
| Liu Chia-Lo; Chuang Yu-chih Institute of Metal Research; Academia Sinica |
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Cite this article:
Liu Chia-Lo; Chuang Yu-chih Institute of Metal Research; Academia Sinica. ISOTHERMAL STRUCTURAL DECOMPOSITION IN CERTAIN Mo-BEARING STAINLESS STEELS. Acta Metall Sin, 1960, 5(1): 24-41.
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Abstract The structural changes in certain quenched ferritic, austenitic and duplex stainless steels during subsequent reheating are described and discussed in detail.In 16-6 Cr-Mo stainless steel, austenite formed at certain solution treatment temperature is metastable and decomposes during subsequent reheating. New ferrite α′ forms at the γ/α interphase boundaries, the rejected carbon atoms then diffuse into the matrix forming alloyed carbides surrounding the γ/α phase boundarries.Fine carbides precipitated from ferrite in 16-6 Cr-Mo, 16-2.5-6 Cr-Ni-Mo, and 16-5-6 Cr-Ni-Mo steels in the early stages of ageing are metastable, during prolonged heating they redissolve and are gradually replaced by χ-phase. Some residual carbides serve as the nuclei of the growing χ-phase. The structure of quenched 16-15-6 Cr-Ni-Mo steel is austenitic, during subsequent heating only M_6C and M_(23)C_6 mixed carbides are precipitated.Both the alloyed carbides and χ-phase may markedly affect the hardness of the steels studied. In the duplex steels χ-phase is a good strengthener, manifesting pronounced hardening effect at elevated temperature.
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Received: 18 January 1960
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