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Acta Metall Sin  2009, Vol. 45 Issue (12): 1446-1450    DOI:
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BEHAVIOR OF AUSTENITE GRAIN GROWTH IN X12CrMoWVNbN10-1-1 FERRITE HEAT-RESISTANT STEEL
HAN Lizhan; CHEN Ruikai; GU Jianfeng; PAN Jiansheng
School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai Key Laboratory of Materials Laser Processing and Modification; Shanghai 200240
Cite this article: 

HAN Lizhan CHEN Ruikai GU Jianfeng PAN Jiansheng. BEHAVIOR OF AUSTENITE GRAIN GROWTH IN X12CrMoWVNbN10-1-1 FERRITE HEAT-RESISTANT STEEL. Acta Metall Sin, 2009, 45(12): 1446-1450.

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Abstract  

The kinetic law of austenite grain growth in the X12CrMoWVNbN10–1–1 ferrite heat–resistant steel, which has been used as the high and medium pressure rotor of ultra–supercritical generating units, has been studied by quantitatively measurement of the austenite grain size after austenitized from 1010 ℃ to 1200 ℃ with holding time from 5 to 1200 min. The results show that the grain grows in a normal grain growth (NGG) mode when the austenitizing temperature is lower than 1050 ℃, and the homogeneous small grains can be obtained even the holding time reaches 1200 min. When the austenitizing emperature lies between 1050 ℃and 1120 ℃with different holding tme, the bnormal grain growth (AGG) can be bserved. At even higher temperature than 1150 ℃, the austenite grains grow rapidly with a NGG mode. The austenitizintemperature and holdng time are thus determined or different austeize grain states, and the parameters in te NGG knetic equation are fit.

Key words:  austenite grain      abnormal grain growth      boundary migration activation energy      ferrite heat-resistant steel     
Received:  31 May 2009     
ZTFLH: 

TG115.21

 
  TG142.7

 
Fund: 

Supported by Science and Technology Commission of Shanghai Municipality (No.08DZ1100302)

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I12/1446

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