锰原料对低合金TRIP钢中非金属夹杂物的影响  

Effect of manganese raw materials on non-metallic inclusions in low alloy TRIP steel

作　　者：朱航宇[1,2] 王伟胜 赵吉轩 李建立[1] 宋明明[2] 薛正良[1,2] ZHU Hang-yu;WANG Wei-sheng;ZHAO Ji-xuan;LI Jian-li;SONG Ming-ming;XUE Zheng-liang(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学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 [2]武汉科技大学钢铁冶金新工艺湖北省重点实验室,湖北武汉430081

出　　处：《钢铁》2022年第1期66-73,共8页Iron and Steel

基　　金：国家自然科学基金资助项目(52074199);国家自然科学基金联合基金重点资助项目(U20A20270)。

摘　　要：为了研究不同锰合金原料对TRIP钢洁净度的影响及锰合金中非金属夹杂物的遗传特性,采用SEM-EDS分别检测了电解锰、金属锰和中碳锰铁中非金属夹杂物的类型、形貌和尺寸,并通过高温试验和热力学计算系统探讨了采用3种锰原料进行合金化后TRIP钢中非金属夹杂物特征。结果表明,电解锰中夹杂物主要为MnC、MnC-MnO和MnO-MnS以及微量MnO,金属锰中夹杂物为球形的纯MnO、纯MnS和MnO-MnS复合夹杂,中碳锰铁中夹杂物主要为MnO-SiO_(3)和MnO-SiO_(3)-MnS复合夹杂,也发现微量MnC颗粒和残余元素富集相;冶炼过程先加入铝、硅后,钢中夹杂物为Al_(2)O_(3),未发现AlN和含硅夹杂物,而加入锰原料后,钢中夹杂物演变为单一Al_(2)O_(3)、MnS、AlN夹杂以及Al_(2)O_(3)-MnS和Al_(2)O_(3)-AlN复合夹杂;对TRIP钢而言,采用电解锰、金属锰和中碳锰铁进行合金化后,钢中非金属夹杂物类型差别不大;由于TRIP钢的高铝特性,锰合金中MnC和MnS夹杂物在钢液中分解,MnO和SiO_(3)夹杂物在冶炼过程中被铝还原为Al_(2)O_(3)夹杂,锰硅氧化物夹杂的演变路线为MnO/MnO-SiO_(3)→Al_(2)O_(3)→MnS/Al_(2)O_(3)-MnS。由于铝、氮、锰和硫在凝固前沿的偏析和富集,TRIP钢凝固过程中分别析出纯AlN夹杂和纯MnS夹杂,或以异质形核的形式生成Al_(2)O_(3)-MnS和Al_(2)O_(3)-AlN复合夹杂。此外,由于锰合金中含有一定氮元素且锰可增加钢液中氮的固溶度,添加锰原料会促进AlN夹杂的形成。To clarify the effects of manganese materials on the cleanness of TRIP steel and the hereditary character from manganese alloys to steels,the type,morphology,and size of non-metallic inclusions(NMI)were detected using SEM-EDS.Then,the NMI characteristics in TRIP steel were systematically discussed based on high-temperature experiments and thermodynamic calculations.The results show that,the main inclusions in electrolytic manganese were MnC,MnC-MnO,MnO-MnS and trace MnO,the main inclusions in manganese metal were single MnO,single MnS and complex MnO-MnS,and the medium carbon ferromanganese mostly contained complex MnO-SiO_(3)and MnO-SiO_(3)-MnS inclusions,the trace MnC particles and enrichment phases of residual elements were also detected.During alloying process,the dominant NMI was Al_(2)O_(3)after the addition of Al and Si,and then the NMIs were changed to Al_(2)O_(3),MnS,AlN,Al_(2)O_(3)-MnS and Al_(2)O_(3)-AlN after manganese addition after Mn alloying.For TRIP steel,after alloying with electrolytic manganese,manganese metal and medium carbon ferromanganese,there was little difference in the types of NMIs in the steel.Due to the high-Al characteristic in molten steel,the MnC and MnS inclusions from manganese materials were dissolved to molten steel,and then the MnO and SiO_(3)inclusions were reduced to Al_(2)O_(3).The evolution route of manganese and silicon oxides during the smelting process was MnO/MnO-SiO_(3)→Al_(2)O_(3)→MnS/Al_(2)O_(3)-MnS.During the solidification,pure AlN and MnS inclusions precipitated or Al_(2)O_(3)-MnS and Al_(2)O_(3)-AlN complex inclusions were formed,due to the enrichment and segregation of Al,N,Mn and S elements.Moreover,the addition of manganese materials may promote the formation of AlN inclusion,the possible explanation was that manganese materials contained N element or Mn increased the solubility of N element.

关 键 词：TRIP钢 夹杂物 高铝钢 电解锰 金属锰 锰合金 

分 类 号：TG142.1[一般工业技术—材料科学与工程]