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Acta Metall Sin  2012, Vol. 48 Issue (10): 1175-1185    DOI: 10.3724/SP.J.1037.2012.00236
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CAO Yu1, DI Hongshuang1, ZHANG Jiecen1, ZHANG Jingqi1, MA Tianjun2
1.State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
2.Special Steel Business Unit, Baoshan Iron&Steel Co., Ltd., Shanghai 200940
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In order to optimize the hot working technology of Incoloy 800H, the dynamic recrystallization (DRX) behavior of Incoloy 800H at temperatures ranging from 850 ℃ to 1100 ℃ and strain rates from 0.01 s-1 to 10 s-1 was investigated by single–pass compression tests on MMS–300 thermo–mechanical simulator. The evolutions of microstructure and nucleation mechanisms of DRX were analyzed combined with the technique of EBSD and TEM. The results show that when the deformation temperature is below 950 ℃, the behavior of DRX is obviously restrained by precipitation of Cr23C6 and Ti(C,N). Therefore the hot deformation constitutive equations in two temperature intervals (from 850 ℃ to 950 ℃and from 950 ℃ to 1100 ℃) were established by regression analysis with the deformation activation energy of 465.394 kJ/mol and 427.360 kJ/mol respectively. The inflection points were determined by fitting a third order polynomial to the lnθ–ε curves, which makes the prediction for the ratios of critical stress to peak stress and critical strain to peak strain more accurately. Accordingly, the mathematical models of critical stress and critical strain vs Z parameter were deduced. The DRX nucleation mechanisms of Incoloy 800H during hot deformation mainly include strain induced grain boundary migration, grain fragmentation and subgrain coalescence.

Key words:  Incoloy 800H      dynamic recrystallization      constitutive equation      critical strain      strain induced grain boundary migration     
Received:  27 April 2012     
ZTFLH:  TG146.4  

Supported by National Basic Research Program of China (No.2011CB606306–2)

Cite this article: 

CAO Yu DI Hongshuang ZHANG Jiecen ZHANG Jingqi MA Tianjun. RESEARCH ON DYNAMIC RECRYSTALLIZATION BEHAVIOR OF INCOLOY 800H. Acta Metall Sin, 2012, 48(10): 1175-1185.

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