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| ISOTHERMAL DECOMPOSITION OF DELTA-FERRITE IN 0Cr17Mn14Mo2N STAINLESS STEEL |
| Chen Liang-shi and Feng Tie-ying (Institute of Metal Research; Academia Sinica) |
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Cite this article:
Chen Liang-shi and Feng Tie-ying (Institute of Metal Research; Academia Sinica). ISOTHERMAL DECOMPOSITION OF DELTA-FERRITE IN 0Cr17Mn14Mo2N STAINLESS STEEL. Acta Metall Sin, 1978, 14(2): 153-233.
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Abstract δ-ferrite in 0Cr17Mn14Mo2N stainless steel formed at 1050—1350℃ was measured quantitatively by metallographic methods, and the distribution of alloy elements between δ-ferrite and austenite was determined by electron-probe and electrolytic extraction phase analysis. It was found that the amount of δ-ferrite increases from 23% at 1050℃ to 42% at 1350℃. As to be expected, the concentration difference of Cr, Mn, Mo between δ-ferrite and austenite became increasingly smaller as the solution temperature was increased.After reheating in the range of 550—950℃, several types of transformation in δ ferrite including δ→γ′, δ→κ(χ)+γ′ and δ→δ′+κ(χ) may take place, and phases like Cr_2(CN), (CrFe)_7C_3, Cr_(23)C_6, χ and σ were found to appear. Both the type and product of transformation varied with the temperature of solution treatment and the subsequent isothermal heating. The high Mn content (14%) in steel promoted the formation of χ-phase expressed as Fe_(31)Cr_(14)Mn_(8.5)Mo_(4.5), and its cell constant was α_0~(552)=8.86(?).The kinetics of isothermal transformation in δ ferrite is of the C-curve type with its nose for δ→κ(χ)+γ′ at 850℃.
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Received: 18 February 1978
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