超深拉拔类线材夹杂物及断口分析  被引量:10

Investigation on inclusions and breakages in ultra-deep drawing wire rod

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作  者:王昆鹏 王郢 廖家明 徐建飞 姜敏[3] 王新华[3] WANG Kun-peng;WANG Ying;LIAO Jia-ming;XU Jian-fei;JIANG Min;WANG Xin-hua(Technology Center,Zenith Steel Group Co.,Ltd.,Changzhou 213011,Jiangsu,China;Zenith Special Steel Co.,Ltd.,Changzhou 213011,Jiangsu,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区:[1]中天钢铁集团有限公司技术中心,江苏常州213011 [2]中天特钢有限公司,江苏常州213011 [3]北京科技大学冶金与生态工程学院,北京100083

出  处:《钢铁》2022年第2期101-108,共8页Iron and Steel

摘  要:针对超深拉拔类线材(钢帘线、切割钢丝和金刚线母线等用钢)的夹杂物控制,选取3种不同控制思路的超深拉拔用钢,即夹杂物低熔点化、夹杂物玻璃化和夹杂物低弹性模量化,借助扫描电镜研究了SiO_(2)、SiO_(2)-Al_(2)O_(3)-MnO、SiO_(2)-CaO-Al_(2)O_(3)-(MgO)和SiO_(2)-CaO-MgO-(Al_(2)O_(3))4类典型氧化物夹杂在热轧和拉拔过程的塑性变形和破碎状态,并统计归纳了数千支帘线钢捻制断口、切割钢丝和金刚线母线湿拉断口夹杂物一般特征。结果表明,结晶态的SiO_(2)夹杂在热轧过程不变形,玻璃态的SiO_(2)夹杂热轧过程可塑性变形,两者在拉拔过程均可破碎。低熔点的SiO_(2)-CaO-Al_(2)O_(3)-(MgO)夹杂热轧过程可塑性变形,拉拔过程可破碎。低弹性模量的SiO_(2)-Al_(2)O_(3)-MnO和SiO_(2)-CaO-MgO-(Al_(2)O_(3))热轧过程变形不充分,但拉拔过程可破碎。长期大量的断口统计分析表明,引起超深拉拔线材断丝的夹杂主要为Al-Mg-(Mn)-O尖晶石质(占比38.2%)、Al-O刚玉质(占比32.0%)、Al-Si-O莫来石质(占比21.9%)及少量Mg-Si-(Mn)-O橄榄石质(占比6.3%)和极少数的Zr-O质夹杂(占比1.6%)。断口夹杂物具有高熔点且高弹性模量的特征,这些夹杂物的来源多与精炼或连铸耐火材料相关,断口上未发现低熔点低弹性模量或高熔点低弹性模量的夹杂。内生夹杂物"玻璃化"和外来夹杂物"低弹性模量化"是超深拉拔类线材氧化物夹杂控制的方向。For inclusion control of ultra-deep drawing wire rod(for tire cord,saw wire and diamond wire saw,etc.),three different control ideas of inclusion(low melting point,homogenization and low elastic modulus)of ultra-deep drawing steel were chosen in this paper.Plastic deformation and crush behavior of 4 types typical oxide inclusions(SiO_(2),SiO_(2)-Al_(2)O_(3)-MnO,SiO_(2)-CaO-Al_(2)O_(3)-(MgO)and SiO_(2)-CaO-MgO-(Al_(2)O_(3)))were studied during hot rolling and drawing in ultra-deep drawing wire rod by scanning electron microscope.The general characteristics of inclusions in twist fracture of tire cord and wet drawing fracture of cutting steel wire and electroplate diamond wire saw busbar were examined and summarized.The results show that the crystalline SiO_(2)inclusion cannot deform in the hot rolling process while plastic deformation occurred in glassy SiO_(2)inclusion.Both the crystalline and glassy SiO_(2)inclusion can be crushed into pieces during the drawing process.SiO_(2)-CaO-Al_(2)O_(3)-(MgO)inclusions with low melting point transformed into long strip shape in hot rolling and also crushed into pieces during the drawing process.The deformation of SiO_(2)-Al_(2)O_(3)-MnO and SiO_(2)-CaO-MgO-(Al_(2)O_(3))inclusions with low Young′s modulus in hot rolling was not sufficient,but these two inclusions also crushed into pieces in drawing process.Long-term statistical analysis of a large number of fractures shows that the main inclusions causing wire breakage of ultra-deep drawing wire are Al-Mg-(Mn)-O spinel(38.2%),Al-O corundum(32.0%),Al-Si-O mullite(21.9%),a small amount of Mg-Si-(Mn)-O olivine(6.3%)and very few Zr-O inclusions(1.6%).The fracture inclusions have the characteristics of high melting point and high elastic modulus.The sources of these inclusions are mostly related to refined or continuous casting refractories.No inclusion with low melting point and low elastic modulus or high melting point and low elastic modulus has been found on the fracture.“Homogenization”of endogenous inclusions and“l

关 键 词:夹杂物 热轧 拉拔 断口 塑性 破碎 

分 类 号:TG356[金属学及工艺—金属压力加工]

 

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