快速热处理温度对Fe-0.16C-1.4Mn钢组织和性能的影响  

Effect of fast heat treatment temperature on microstructure and properties of Fe-0.16C-1.4Mn steel

作　　者：赵甲正 张俊 李俊[2] 王健[2] ZHAO Jia-zheng;ZHANG Jun;LI Jun;WANG Jian(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Research Institute,Baoshan Iron&Steel Co Ltd,Shanghai 201999,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]宝山钢铁股份有限公司中央研究院,上海201999

出　　处：《材料热处理学报》2025年第2期190-203,共14页Transactions of Materials and Heat Treatment

摘　　要：通过感应加热的方式,利用多功能退火模拟实验机对Fe-0.16C-1.4Mn低合金高强钢进行快速热处理。采用X射线衍射仪、扫描电镜、电子背散射衍射技术、电子探针和透射电镜等研究了不同温度退火(660~810℃)保温不同时间(1和30 s)对实验钢微观组织和性能的影响。结果表明:退火温度会显著影响实验钢的微观组织和力学性能;提高退火温度,实验钢的组织发生了从冷轧带状组织到再结晶铁素体再到马氏体双相组织的转变,这一转变伴随着晶粒的细化和等轴化,会显著影响其力学性能;在690℃退火保温30 s的条件下,实验钢得到了高屈服强度(516 MPa)和高伸长率(21.1%)的优异结合,适合作为建筑用高强钢;而在750℃退火保温30 s的条件下,实验钢表现出低屈强比和高抗拉强度(964 MPa),伸长率为13.6%,适合作为汽车用双相钢;Fe-0.16C-1.4Mn钢在拉伸过程中发生了部分再结晶和双相组织塑性应变不相容现象,这会对裂纹产生方式造成影响,进而影响其伸长率。Fast heat treatment of Fe-0.16C-1.4Mn low-alloy high-strength steel was carried out using a multifunctional annealing simulation experimental machine through induction heating.The effect of annealing at different temperatures(660-810 ℃) and holding for different time(1 s and 30 s) on microstructure and properties of the experimental steel was studied using X-ray diffractometer,scanning electron microscopy,electron backscatter diffraction technique,electron probe and transmission electron microscopy.The results show that the annealing temperature significantly affects the microstructure and mechanical properties of the experimental steel.By increasing the annealing temperature,the microstructure of the experimental steel undergoes a transformation from cold-rolled band structure to recrystallized ferrite and then to martensite duplex structure.This transformation is accompanied by grain refinement and equiaxed,which significantly affects its mechanical properties.Under the condition of annealing at 690 ℃ for 30 s,the experimental steel achieves an excellent combination of high yield strength(516 MPa) and high elongation(21.1%),making it suitable as a high-strength steel for construction.Under the condition of annealing at 750 ℃ for 30 s,the experimental steel exhibits low yield strength ratio and high tensile strength(964 MPa),with an elongation of 13.6%,making it suitable as a duplex steel for automobiles.During the tensile,the plastic strain incompatibility phenomenon between partial recrystallization and duplex structure of the Fe-0.16C-1.4Mn steel is observed,which affects the mode of crack formation and subsequently affects its elongation.

关 键 词：快速热处理 低合金高强钢 微观组织 力学性能 再结晶 塑性不相容 

分 类 号：TG142.3[一般工业技术—材料科学与工程]