摘要
热轧带钢生产中除鳞后残留的初生氧化铁皮,将严重影响产品的表面质量。用GLEEBLE3500热模拟试验机对含Si 0.25%的低合金钢进行高温拉伸氧化铁皮剥离实验,通过扫描电子显微镜(SEM)分析试样表面微观形貌,金相法统计试样氧化铁皮剥离区面积,EDS对试样表面的残留氧化铁皮与基体的截面进行成分分析。结果表明:剥离温度越高,氧化铁皮的剥落方式由穿晶断裂转变为晶界断裂。氧化铁皮产生一定的变形量,会促进氧化铁皮的剥离。剥离区域的Si元素含量很少,而未剥离区的氧化铁皮与基体界面的截面处Si元素含量较高,说明Si元素反应生成的Fe_(2)SiO_(4),在凝固状态下会对氧化铁皮起到强烈的钉扎作用,使剥离困难。含Si0.25%的低合金钢,当氧化铁皮的剥离温度在1200℃左右时,高于FeSiO_(4)的熔点温度,将有利于氧化铁皮的剥离。
The primary scale remaining after descaling in hot rolled strip production will seriously affect the surface quality of products.Tensile scale peeling experiment of low alloy steel containing Si 0.25%at high temperature was carried out by GLEEBLE3500 thermal simulation testing machine.The SEM was used to analyze the micro-morphology of the sample surface,metallographic method was used to calculate the scale peeling area of the sample,and EDS was used to analyze the composition of the residual scale on the sample surface and the cross section of the matrix.The results show that the higher the peeling temperature is,the peeling mode of scale changes from transgranular fracture to grain boundary fracture.A certain amount of deformation of scale will promote the peeling of scale.There is little Si content in the stripped area,while the Si content in the cross section of the interface between the scale and the substrate in the non-stripped area is higher,which indicates that Fe_(2)SiO_(4) produced by the reaction of si elements will strongly pin the scale in the solidified state,making stripping difficult.Low alloy steel containing Si 0.25%,when the peeling temperature of scale is about 1200℃,which is higher than the melting point temperature of Fe_(2)SiO_(4),will be beneficial to the peeling of scale.
作者
张博睿
李志伟
张丽强
余伟
ZHANG Borui;LI Zhiwei;ZHANG Liqiang;YU Wei(Ningbo Iron and Steel Company Manufacturing Management Department,Ningbo 315800,China;Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《山东冶金》
CAS
2022年第2期31-33,38,共4页
Shandong Metallurgy
基金
国家十三五重点研发计划项目(2017YFB0304602)。
关键词
热轧带钢
低合金钢
氧化铁皮
变形
剥离
hot rolled strip steel
low alloy steel
oxide scale
deformation
removability
