脱氧工艺对钢中夹杂物的影响
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摘要
为明确不同脱氧剂加入顺序对钢中夹杂物的影响,对夹杂物的形成进行了热力学分析,并在1 873K下,在MoSi_2电阻炉上用Φ70mm×100mm MgO坩埚开展了2炉低碳合金钢A冶炼实验。热力学计算表明,Si-Mn脱氧主要形成SiO_2夹杂物及少量2MnO·SiO_2复合化合物,Al-Si脱氧主要形成Al_2O_3夹杂物,实验结果与热力学计算相互吻合。实验结果表明,先采用Si-Mn脱氧的1号工艺与先采用Al脱氧的2号工艺相比,夹杂物尺寸和面积百分比均较低。1号工艺终点夹杂物总数为168个/μm2,小于1.5μm的夹杂物占70%以上,夹杂物平均直径为1.2μm。先弱脱氧后强脱氧的工艺更利于夹杂物的控制。
In order to study the effect of the addition order of the deoxidizer on inclusions in steel,the thermodynamics analysis of the formation of inclusion was studied,and two stoves of low carbon alloy steel A were smelted in a MoSi_2 furnace withΦ70mm×100mm MgO crucible at 1 873 K.The thermodynamic calculation indicates that the main inclusions are SiO_2 and a small amount of 2MnO·SiO_2by the method of Si-Mn deoxidation,while the Al-Si deoxidation produces the Al_2O_3 inclusions mainly.The experiments results concide with the calculation.The size and area percentage of the inclusions in No.1process which uses Si-Mn as deoxidation firstly are lower than that in No.2process which uses Al as deoxidation firstly.The number of the inclusions is 168 per square micron in the end of No.1process.Among these inclusions,those whose size is under 1.5μm take more than 70%,and the average size of the inclusions is 1.2μm.The process,whose addition order of the deoxidizer is from weak to strong,is conducive to control the inclusion.
In order to study the effect of the addition order of the deoxidizer on inclusions in steel,the thermodynamics analysis of the formation of inclusion was studied,and two stoves of low carbon alloy steel A were smelted in a MoSi_2 furnace withΦ70mm×100mm MgO crucible at 1 873 K.The thermodynamic calculation indicates that the main inclusions are SiO_2 and a small amount of 2MnO·SiO_2by the method of Si-Mn deoxidation,while the Al-Si deoxidation produces the Al_2O_3 inclusions mainly.The experiments results concide with the calculation.The size and area percentage of the inclusions in No.1process which uses Si-Mn as deoxidation firstly are lower than that in No.2process which uses Al as deoxidation firstly.The number of the inclusions is 168 per square micron in the end of No.1process.Among these inclusions,those whose size is under 1.5μm take more than 70%,and the average size of the inclusions is 1.2μm.The process,whose addition order of the deoxidizer is from weak to strong,is conducive to control the inclusion.
引文
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[2]周志伟,俞杰.齿轮用钢SAE8620的研制[J].现代冶金,2011,39(4):11.
[3]战东平,张慧书,李术川,等.AlMnCa合金脱氧和非金属夹杂物控制技术[J].东北大学学报:自然科学版,2006,27(10):1118.
[4]吕春风,尚德礼,于广文.不同脱氧工艺对微合金钢组织和力学性能的影响[J].铸造技术,2010,31(8):1004.
[5]宋宇,武国平,吴天礼.氧化物冶金技术在改善钢材组织和性能中的应用[J].中国冶金,2012,22(6):1.
[6]尚德礼,李德刚,吕春风,等.基于氧化物冶金技术的钛/铝脱氧技术应用研究[J].北京科技大学学报,2010,32(11):1418.
[7]郑万,吴振华,李光强,等.Ti-Mg复合脱氧和硫含量对钢中夹杂物特征及MnS析出行为的影响[J].工程科学学报,2015,37(3):292.
[8]Liu C,Bhole S D.Challenges and developments in pipeline weldability and mechanical properties[J].Science and Technology of Welding and Joining,2013,18(2):169.
[9]Beidokhti B,Dolati A,Koukabi A H.Effects of alloying elements and microstructure on the susceptibility of the welded HSLA steel to hydrogen-induced cracking and sulfide stress cracking[J].Materials Science and Engineering,2009,507A(1/2):167.
[10]梁英教,车荫昌,李乃均,等.无机物热力学数据手册[M].沈阳:东北大学,1994.
[11]Ohta H,Suito H.Activities in CaO-SiO2-Al2O3slags and deoxidation equilibria of Si and Al[J].Metallurgical and Materials Transactions,1996,27B(6):943.
[12]倪冰,刘浏,姚同路.钢中铝-硅-锰复合脱氧反应的热力学计算[J].钢铁研究学报,2011,23(9):8.
[13]Sigworth G K,Elliott J F.The thermodynamics of liquid dilute iron alloys[J].Metal Science,1973,8(1):298.
[14]黄健,闵义,姜茂发,等.IF钢生产过程非金属夹杂物的演变行为[J].东北大学学报:自然科学版,2013,34(3):368.
[15]李丰功,战东平,张佩灿,等.脱氧合金化工艺对高铝钢中夹杂物的影响[J].中国冶金,2013,23(7):21.