Abstract：The effects of intermediate billet cooling on surface microstructure and property of Q345A steel heavy plate were investigated by the methods of thermal and numerical simulation, mechanical property testing and metallographic examination. The results show that the ultrafine ferrite microstructure with average grain size of 1μm can be obtained on 2mm surface layer while a little pearlite phase disperses in it. The matrix microstructure consists of massive ferrite and pearlite which is similar to that of the sample manufactured by the conventional TMCP. The matrix mechanical property, low temperature toughness will not be decreased by intermediate billet cooling. And the hardness on surface is a little more center of steel. Compared new TMCP (with intermediate billet cooling) with conventional TMCP, the steel has excellent crack arrest property.
收稿日期: 2011-10-25
出版日期: 2012-09-05
引用本文:
杨颖，侯华兴，张哲. 中间坯快冷技术对Q345A厚板表层组织和性能的影响[J]. 钢铁, 2012, 47(8): 48-51.
YANG Ying,HOU Hua-xing,ZHANG Zhe. Effects of Intermediate Billet Cooling on Surface Microstructure and Property of Q345A Steel Heavy Plate. Iron and Steel, 2012, 47(8): 48-51.
2012, Vol. 47 
