福建冶金2024，Vol.53Issue(5)：36-39,4.
Nb微合金化Q345qD钢的连续冷却转变行为
Continuous Cooling Transformation Behavior of Nb Microalloyed Q345qD Steel
摘要
Abstract
Dual pass hot compression deformation experiments were conducted on MMS-300 thermal simulation testing machine to simulate the dynamic continuous cooling transformation process of Nb microalloyed Q345qD steel.The dynamic continuous cooling transformation curve of Nb microalloyed Q345qD steel was plotted using the thermal expansion method combined with metallographic examination and hardness measurement.The results showed that when the cooling rate is 0.5℃/s～1℃/s,the room temperature microstructure of Nb microalloyed Q345qD steel is mainly composed of polygonal ferrite and pearlite.As the cooling rate increases to 2℃/s,a large amount of bainite appears in the room temperature microstructure.When the cooling rate is 5℃/s～20℃/s,the room temperature structure is mainly composed of ferrite and acicular bainite.With the increase of cooling rate from 0.5℃/s to 20℃/s,the ferrite grains refine gradually and its content decreases,while the content of bainite increases gradually,and the microhardness of Nb microalloyed Q345qD steel increases from 159.2 HV to 271.8 HV.关键词
Q345qD钢/连续冷却转变/室温组织/显微硬度Key words
Q345qD steel/continuous cooling transformation/room temperature microstructure/microhardness引用本文复制引用
黄家能,詹光曹,王义惠,许智平,周汝锦,朱丽娜,戴品强..Nb微合金化Q345qD钢的连续冷却转变行为[J].福建冶金,2024,53(5):36-39,4.基金项目
福建省自然科学基金资助项目(项目编号:2021J05224) （项目编号:2021J05224）
