Acta Metall Sin  2006, Vol. 42 Issue (8): 805-809     DOI:

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IN-SITU OBSERVATION OF NUCLEATION AND GROWTH OF HIGH-TEMPERATURE δ PHASE DURING AUSTENITE → FERRITE+LIQUID PHASE TRANSFORMATION IN AN AISI304 STAINLESS STEEL

Gaofei Liang;;

上海宝钢技术中心前沿技术研究所

Gaofei Liang. IN-SITU OBSERVATION OF NUCLEATION AND GROWTH OF HIGH-TEMPERATURE δ PHASE DURING AUSTENITE → FERRITE+LIQUID PHASE TRANSFORMATION IN AN AISI304 STAINLESS STEEL. Acta Metall Sin, 2006, 42(8): 805-809 .

Abstract References Related Articles Recommended Metrics Download:  PDF(4065KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The nucleation and growth behaviors of high-temperature δ during austenite (γ) → ferrite (δ) + liquid (L) phase transformation in an AISI30 stainless steel have been observed in-situ by using a confocal laser scanning microscope. The results show that δ appears prior from the γ crystal boundary at the temperature range from 1300 to 1400 0C, and appears at full blast in the γ gains above 1410 0C. The γ→δ+L phase transformation is controlled mainly the diffusion of Ni atoms near the γ/δ/L phase interface. With the increment of temperature risen rate, the size of δ gain decreases, the δ/γ planer interface becomes unstable, and a certain secondary branch appears. The δ grows mainly in the non-faceted style at first. Twin-crystal is the key shape of the sidestep forming in the δ/γ interface. The faceted δ trends to passivate its edge and transfers to non-faceted style with the γ →δ+L phase transformation. The mechanisms of the growth interface instability for δ are discussed by using the critical wavelength to stabilize a planar interface theory. The transformation reason for growth style of δ is analyzed by using the crystal dynamics theory. Key words:  AISI 304 stainless steel      confocal laser scanning microscope      ferrite      austenite      in-situ observation       Received:  03 November 2005      ZTFLH:  TG113   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors Gaofei Liang URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2006/V42/I8/805 [1]Allan G K.Iron Steel Making,1995;22:465 [2]Yin H,Emi T,Shibata H.Acta Mater,1999;47:1523 [3]Dippenaar R,Phelan D.Metall Mater Trans,2003;34B:495 [4]Phelan D,Dippenaar R.ISIJ Int,2004;44:414 [5]Phelan D,Dippenaar R.Metall Mater Trans,2004;35A:3701 [6]McDonald N,Sridha S.JOM,2004;56:182 [7]Hu G X,Cai X.Materials Science Foundation.Shanghai:Shanghai Jiaotong University Press,2000:131(胡赓祥，蔡珣．材料科学基础．上海：上海交通大学出版社，2000：131) [8]Hu H Q.Metal Solidification.Beijing:Metallurgical Industry Press,1985:93(胡汉起．金属凝固．北京：冶金工业出版社，1985：93)G [1] DING Hua, ZHANG Yu, CAI Minghui, TANG Zhengyou. 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