Abstract：The microstructure, mechanical property and hole expansion property of 800 MPa-level hot-rolled acid-pickled hole expansion steel at different coiling temperatures were analyzed by optical microscope, scanning electron microscope, tensile tester and hole punching expansion tester. The results showed that the microstructure was mainly composed of ferrite + bainite when the coiling temperature was 450-600 ℃. With the increase of coiling temperature, the ferrite grains increased, while the volume fraction of bainite decreased gradually. The yield strength and tensile strength of the material were improved, the elongation had no significant change, and the hole expansion rate was reduced obviously. With overall consideration, when the coiling temperature was 450-500 ℃, the tensile strength was higher than 780 MPa, and the hole expansion rate was above 50%.
刘阳, 卢茜倩, 谷海容, 马聪, 陈忠, 田志俊. 卷取温度对800 MPa级高扩孔钢组织与性能的影响[J]. 物理测试, 2024, 42(1): 28-31.
LIU Yang, LU Qianqian, GU Hairong, MA Cong, CHEN Zhong, TIAN Zhijun. Effect of coiling temperature on microstructure and properties of 800 MPa-level high hole expansion steel. PHYSICS EXAMINATION AND TESTING, 2024, 42(1): 28-31.
2024, Vol. 42 
