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The solidification path of AISI 304stainless steel has been investigated. The mechanism of three-phase reaction was confirmed as peritectic not eutectic. The retained delta-ferrite is the result of incomplete peritectic
reaction.
1
3Origin of the lathy ferrite in AISI 304stainless steel during directional 4
solidification
567J.W.Fu ⇑,Y.S.8Institute of Metal Research,910121314151617181920212223
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3536373839404142434445464748495051525354555657585960now,the actual mechanism of three-phase reactions is still not 61
clear,and most often it is referred to as peritectic/eutectic reaction 6263646566
67686970717273747576777879808182
838485304stainless steel at three-phase (L +d +c )reaction stage.86According to the results in Fig.1,some typical solidification char-87acteristics can be obtained.Firstly,primary lathy delta-ferrite is ar-88ranged in an entangled cluster and is enveloped by austenite.89
Secondly,the microstructure,consisting of lathy delta-ferrite and
0925-8388/$-see front matter Ó2013Published by Elsevier B.V./10.1016/j.jallcom.2013.05.107
Corresponding author.Tel.:+862423971727;fax:+862423844528.
E-mail address:jwfu@imr.ac (J.W.Fu).
Q1Please cite this article in press as:J.W.Fu ,Y.S.Yang ,J.Alloys Comp.(2013),/10.1016/j.jallcom.2013.05.107
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micrograph of lathy ferrite during solidification indicating
transformation with arrows.(a)TEM darkfield image and(b)Selected area diffraction patterns by TEM.(a)austenite with[01
ferrite with[001]zone axis.
Please cite this article in press as:J.W.Fu,Y.S.Yang,J.Alloys Comp.(2013),/10.1016/j.jallcom.2013.05.107
154experimental results do not support this hypothesis.Fig.2shows 155the darkfield and brightfield TEM images of lathy delta-ferrite 156during solidification.Selected area diffraction patterns indicate 157that lathy phase and the matrix are identified as delta-ferrite and 158austenite,respectively,as shown in Fig.3.Fig.2a indicates clearly 159that the tip of the lathy delta-ferrite deviates from the ellipsoid 160
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190 stainless steel has been revealed using directional solidification
191 and liquid quenching.The mechanism of three-phase reaction dur-
192 ing solidification has been clarified.It is confirmed that primary
193 delta-ferrite precipitates from the meltfirst during solidification.
194 At the three-phase reaction stage,austenite is formed through
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197tectic reaction and the morphology of delta-ferrite is changed.198After peritectic reaction is completed,the retained liquid trans-199forms into austenite directly.200Acknowledgements
201This work was financially supported by the National Natural 202Science Foundation of China and Shanghai Baosteel Group Corpo-203ration
51004095).204References
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Please cite this article in press as:J.W.Fu ,Y.S.Yang ,J.Alloys Comp.(2013),/10.1016/j.jallcom.2013.05.107

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