Microstructural Modification of Q345D Steel by Air-Cooling Solidification in Different Time
After the Q345D steel smelted in the medium frequency furnace,the microstructural could be gotten by different cooling rate.The main microstructural was pearlite by sand cooling,bainite by air cooling and martensite by water cooling.Before controlled cooling process,the samples were treated at different air cooling time and all these structures were observed under room temperature after putting the samples into water pool.Meanwhile,the molten Q345D was cooled by water directly,and the structure was inspected which show almost no ferrite in the seen sight.The austenite formed directly from the molten steel transformed into martensite quickly.And its hardness reaching the peak value.The ferrite begin to precipitate from the molten steel,where the martensite be growth big from the austenitic as the air cooling time increased.This time,the hardness of the Q345D steel would be reduced gradually.The bainite began to precipitate along the austenitic grain boundary after the molten steel had been cooled in air for 7s.The bainite transformation was basically completed after 9s,meanwhile there was still some residual austenite.
Q345D low carbon steel solidfication microstructural modification
Li Zhe Ma Ru Liu Bingguang Ma Yonglin
School of Materials Science and Engineering, Wuhan University of Technology, 430070, Wuhan School of Material and Metallurgy, Inner Mongolia University of Science and Technology, 014010, Baot
国际会议
The 4th Australia-China-Japan Joint Symposium on Iron and Steelmaking(第四届中日澳钢铁冶金学术会议)
沈阳
英文
279-283
2012-11-03（万方平台首次上网日期，不代表论文的发表时间）