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Acta Metall Sin  2005, Vol. 41 Issue (4): 401-406     DOI:
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Effect Of Accelerating Cooling On Microstructure And Toughness Of HAZ Of X70 Pipeline Steel
YU Shaofei; QIAN Bainian; GUO Xuming
Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016
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YU Shaofei; QIAN Bainian; GUO Xuming. Effect Of Accelerating Cooling On Microstructure And Toughness Of HAZ Of X70 Pipeline Steel. Acta Metall Sin, 2005, 41(4): 401-406 .

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Abstract  Based on the effect of accelerating cooling on the microstructure and properties of thermo--mechanical control process (TMCP) steel, we proposed to adopt this method for improvement of heat affect zone (HAZ) toughness of X70 pipeline steel. The results of simulated experiment and actual weldment indicate that at appropriate accelerating cooling rate the M--A constituent in HAZ is reduced obviously in amount and replaced by tough austenite films. Coarse bainitic sheaves were obtained when jetting water directly to the sample and the toughness is not improved. Accelerating cooling with appropriate cooling rate is a simple and efficient method to improve the HAZ toughness.
Key words:  pipeline steel      accelerating cooling      austenite film      
Received:  21 April 2004     
ZTFLH:  TG142.1  
  TG406  
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YU Shaofei
QIAN Bainian
GUO Xuming

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