THE DECOMPOSITION OF δ-FERRITE IN A Cr-Ni-Mo-Ti STAINLESS STEEL

Acta Metall Sin

1956, Vol. 1

Issue (4): 337-421 DOI:

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THE DECOMPOSITION OF δ-FERRITE IN A Cr-Ni-Mo-Ti STAINLESS STEEL

CHUANG YU-CHIH AND LIU CHIA-LO Institute of Metal Research;Academia Sinica

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CHUANG YU-CHIH AND LIU CHIA-LO Institute of Metal Research;Academia Sinica. THE DECOMPOSITION OF δ-FERRITE IN A Cr-Ni-Mo-Ti STAINLESS STEEL. Acta Metall Sin, 1956, 1(4): 337-421.

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Abstract The decomposition of δ-ferrite at 750°,850° and 950℃ in quenched 18/8/3/1Cr-Ni-Mo-Ti stainless steel specimens has been studied microscopically,thetransformation products being electrolytically extracted and identified by X-raydiffraction method.At early stages of decomposition accicular austenite forms along certaincrystallographic planes of δ-ferrite.As a result,the remaining ferrite becomesenriched in Cr,Mo and impoverished in C,Ni,Mn,and was found to transformsubsequently to sigma which begins after heating for 5-6 minutes at 850℃.Precipitation of titanium carbide first occurs in the ferrite grains,later itmakes appearance along the ferrite-austenite interphase boundaries and along thetwinning planes within the austenite grain.The precipitation of titanium carbideseems to have no appreciable effect on the sequence of decomposition of δ-ferrite.The impact value of the steel was found to decrease very markedly before thecommencement of the δ→σ transformation and it is considered that this mightbe associated with the titanium carbide precipitation.

Received: 18 April 1956

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