Influence of Controlled Rolling and Cooling on Microstructure and Mechanical Properties of Marine Steel
Author of the article:LI Zhenhua;WANG Haoxu;LI Zhuang;CAI Yiqin;MIAO Bowen;SONG Dianfu;ZHANG Li;LI Yanme
Author's Workplace：School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;State Key Lab of Rolling and Automation,Northeastern University,Shenyang 110819,China
Key Words：ship steel controlled rolling and cooling microstructure mechanical properties
Abstract：The microstructure and properties of two kinds of steel for ship controlled rolling and cooling were studied.The results show that the structures of the two steels are bainite,acicular ferrite,polygonal ferrite and a small amount of pearlite after controlled rolling and cooling.The tensile strength,hardness and low temperature impact toughness of the experimental steel are improved by the combination strengthening of small M-A island and ferrite fine grain.The impact energy of the two experimental steels in the 0°rolling direction is the largest,reaching 238.74 J and 274.68 J,respectively,while the impact energy in the 90°rolling direction is the smallest,and steel B is higher than steel A.The increase of nickel content can improve the hardness,strength,plasticity and low temperature impact toughness of the experimental steel.
