IN SITU OBSERVATION OF GROWTH OF BAINITE IN Fe-Ni ALLOY

Acta Metall Sin

1994, Vol. 30

Issue (8): 344-347 DOI:

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IN SITU OBSERVATION OF GROWTH OF BAINITE IN Fe-Ni ALLOY

YANG Liu; ZHU Degui; ZHANG Jun; CHEN Jian (Southwestern Jiaotong University; Chengdu)

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YANG Liu; ZHU Degui; ZHANG Jun; CHEN Jian (Southwestern Jiaotong University; Chengdu). IN SITU OBSERVATION OF GROWTH OF BAINITE IN Fe-Ni ALLOY. Acta Metall Sin, 1994, 30(8): 344-347.

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Abstract TEM is used to study the interface structure and the thickening kinetics of bainitic ferrite during isothermal transformation of an Fe-30wt-%Ni alloy with the hot stage. It is demonstrated that ferrite possesses ledge morphology with [111]b dislocations at the ferrite/austenite ledge interface. The experimentally measured ferrite thickening rate is shown to be of the same order with those calculated according to Zener-Hillert equation developed for the growth kinetics of ferrite controlled by the volume diffussion of carbon in austenite. All of the results are considered to be support for the ledge growth mechanism for the bainitic ferrite.

Key words: bainitic ferrite growth kinetics ledge growth mechanism

Received: 18 August 1994

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1994/V30/I8/344

1HehemannRF,KinsmanDR、AaronsonHI．MetallTrans,1972;3:10772KinsmanKR,EichenE,AaronsonHI．MetallTrans1975;6A:3033RigsbeeJM,AaronsonHI．ActaMetall,1979,27:3654CahnJW,HilligWB,SearsGW．ActaMetall,1964;12:14215ZenerC．TransAIME;1964;167:5506HillertM,JernkontoretsAnn,1957;141:757

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