快速退火温度对除尘罩用SPCC钢组织及性能演变机理的影响  

Effect of rapid annealing temperature on evolution mechanism of microstructure and properties of SPCC steel for dust hoods

作　　者：胡晶晶 袁清[2] 任杰[2] 熊乐 包琳琳 Hu Jingjing;Yuan Qing;Ren Jie;Xiong Le;Bao Linlin(School of Automotive Engineering,Foshan Polytechnic,Foshan Guangdong 528137,China;State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan Hubei 430081,China)

机构地区：[1]佛山职业技术学院汽车工程学院,广东佛山528137 [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,湖北武汉430081

出　　处：《金属热处理》2025年第2期107-113,共7页Heat Treatment of Metals

基　　金：佛山职业技术学院高层次人才专项(KY2022G07);湖北省自然科学基金(2024AFB900);中国博士后科学基金(2022M710596)。

摘　　要：基于前期提出的SPCC钢快速退火方式,研究了快速退火温度对SPCC钢晶粒尺寸、取向分布、力学性能三者关系的影响。结果表明,快速退火温度成为影响铁素体晶粒尺寸的关键因素,快速退火工艺为650℃×100 s时,SPCC钢抗拉强度可达487.09 MPa,断后伸长率为26.84%,强塑积为13.07 GPa·%。当快速退火温度较高时,晶粒会变得粗大,同时有利的{111}织构会得到增强,故强度会显著降低,而断后伸长率则会相对较高。相反,快速退火温度较低,由于第二相颗粒未充分熟化且铁素体晶粒未明显粗化,材料的强度会较高,但断后伸长率会明显下降。此外,晶粒细化后,材料的加工硬化能力会减弱,同时{111}织构弱化。这两者的综合作用导致在快速退火方式下材料的断后伸长率相比传统退火方式出现明显下降。另外,在100 s的快速退火保温时间内,较高的快速退火温度有助于多数铁素体晶粒的长大行为趋于一致,从而改善铁素体晶粒的混晶程度。Based on the previously proposed rapid annealing method for SPCC steel,the influence of rapid annealing temperature on the relationship among grain size,orientation distribution,and mechanical properties of the SPCC steel was investigated.The results indicate that the rapid annealing temperature is a crucial factor affecting the size of ferrite grains.When the rapid annealing process is conducted at 650℃for 100 s,the tensile strength of the SPCC steel can reach 487.09 MPa,with the elongation after fracture of 26.84%and the product of strength and elongation(PSE)of 13.07 GPa·%.At higher rapid annealing temperature,the grains become coarse,and the favorable{111}texture is enhanced,leading to a significant reduction in strength but a relatively high elongation.Conversely,at lower rapid annealing temperature,due to insufficient ripening of second-phase particles and no significant coarsening of ferrite grains,the material exhibits higher strength but a noticeable decrease in elongation.Furthermore,after grain refinement,the work-hardening ability of the material is diminished,and the{111}texture is weakened.The combined effect of these two factors results in a significant decrease in elongation compared to the traditional annealing methods under rapid annealing.Additionally,within a rapid annealing holding time of 100 s,a higher rapid annealing temperature facilitates a more uniform growth behavior among most ferrite grains,thereby improving the mixed grain structure of ferrite grains.

关 键 词：SPCC钢 快速退火 铁素体 晶粒尺寸 织构 断后伸长率 

分 类 号：TG142.1[一般工业技术—材料科学与工程]