摘要
利用SEM、XRD、EPMA等试验方法,对不同退火、固溶以及时效工艺下Fe-Mn-Al-C钢的组织演变规律和力学性能进行研究。结果表明,900~1050℃退火温度对试验钢的组织与性能影响较大,随着退火温度的升高晶粒尺寸增大、碳化物逐渐回溶,强度降低、塑韧性提高,在1050℃保温2 h空冷时抗拉强度为1036 MPa,断后伸长率为39%,冲击功41 J,强塑积40 GPa·%;经1050℃保温2 h水冷固溶后时效处理,试验钢组织为奥氏体+铁素体+κ碳化物,随着时效温度的增高,κ碳化物逐渐析出,使试验钢的强度增加、塑韧性降低。600℃时效时,抗拉强度1145 MPa、断后伸长率22%、冲击功28 J,综合力学性能全部满足设计要求。
The microstructure evolution and mechanical properties of Fe-Mn-Al steel under different annealing,solution and aging processes are studied by meansa of SEM,XRD and EPMA.The results show that the 900-1050℃annealing temperature has a great influence on the microstructure and properties of the tested steel.With the increase of annealing temperature,the grain size increases,the carbide gradually redissolved,the strength decreases,and the plasticity-toughness improves.When the annealing temperature is at 1050℃for 2 h air cooling,the tensile strength is 1036 MPa,the elongation is 39%,the impact energy is 41 J and the best plasticity-strength is 40 GPa·%.The microstructure of the test steel is austenite+ferrite+κcarbides after solution treatment at 1050℃for 2 h and water cooling.With the increase of aging temperature,κcarbides precipitate gradually,which increases the strength and decreases the plasticity and toughness of the test steel.When aged at 600℃,the tensile strength is 1145 MPa,the elongation is 22%and the impact energy is 28 J,the comprehensive mechanical properties all meet the design requirements.
作者
侯美伶
李晨潇
孔祥伟
白云
Hou Meiling;Li Chenxiao;Kong Xiangwei;Bai Yun(Research Institute,Jiangyin Xingcheng Special Steel Co.,Ltd.,Jiangyin 214400)
出处
《特殊钢》
2023年第2期96-100,共5页
Special Steel
