快速退火对冷轧超低碳钢组织和性能的影响  

Effect of rapid annealing on microstructure and properties of cold rolled ultra-low carbon steel

作　　者：张瑞 唐恩 袁清[2] 任杰 莫家璇 Zhang Rui;Tang En;Yuan Qing;Ren Jie;Mo Jiaxuan(Zhejiang Industry&Trade Vocational College,Wenzhou Zhejiang 325000,China;State Key Laboratory of Refractories and Metallurgy,Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan Hubei 430081,China)

机构地区：[1]浙江工贸职业技术学院,浙江温州325000 [2]武汉科技大学省部共建耐火材料与冶金国家重点实验室钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《金属热处理》2024年第3期116-121,共6页Heat Treatment of Metals

基　　金：浙江工贸引进人才项目(YJRC202206);国家自然科学基金(52004193);中国博士后科学基金(2022M710596);温州市基础公益项目(G2023068);杭钢重大科研项目(2023ZR01)。

摘　　要：采用OM、SEM、EBSD和单轴拉伸方法,从某冷轧超低碳钢的显微组织、晶粒尺寸分布、晶粒取向和力学性能4个方面对比分析了常规退火工艺(低温长时间)与快速退火工艺(高温瞬时)。结果表明,冷轧超低碳试验钢在650℃快速退火15 s时,屈服强度和抗拉强度分别为445.38 MPa和494.07 MPa,相比常规退火试样性能(屈服强度为274.35 MPa,抗拉强度为388.99 MPa)得到明显提升,同时还保证了24.7%的伸长率。造成常规退火与快速退火试样性能差异的主要原因是晶粒细化与典型的γ取向,其中晶粒细化占主导地位。快速退火具有明显的细晶强化作用,但同时恶化加工硬化能力,从而导致伸长率下降。快速退火会抑制第二相颗粒的析出,且细化第二相颗粒。快速退火试样呈典型的γ取向,更有利于提高轧向性能,但常规退火试样为近γ取向,所以取向的影响较小。Conventional annealing process(long time at low temperature)and rapid annealing process(instantaneous at high temperature)were compared and analyzed from four aspects of microstructure,grain size distribution,grain orientations and mechanical properties of cold rolled ultra-low carbon steel by means of OM,SEM,EBSD and uniaxial tensile test.The results show that after rapid annealing at 650℃for 15 s,the yield strength and tensile strength of the tested steel are 445.38 MPa and 494.07 MPa,respectively,which are obviously increased from that of conventional annealed(i.e.,the yield strength and tensile strength being 274.35 MPa and 388.99 MPa,respectively),while the elongation is still guaranteed up to 24.7%.The grain refinement and the typicalγorientation are the main reasons for the difference of properties between the conventional and rapid annealed specimens,where the grain refinement is the dominant.The rapid annealing has a higher grain refinement strengthening effect,but it deteriorates the work hardening ability and leads to a decrease in elongation.In addition,the rapid annealing inhibits the precipitation of the second phase particles while refines them.By comparison,the rapid annealed specimens show a typicalγorientation,which is more conducive to improving the rolling performance,but that by conventional annealing show a nearγorientation which has less such effect.

关 键 词：快速退火 再结晶 晶粒细化 织构 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]