采用脉冲磁致振荡技术提高矩形AM2锚链钢连铸坯的均匀性
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摘要
制作了尺寸为220 mm×260 mm的矩形锚链钢连铸坯。对部分连铸坯进行了由上海大学开发的脉冲磁致振荡(PMO)处理,以提高铸坯的组织均匀性。试验结果表明:适当的PMO参数可消除连铸坯的中心缩孔,显著增加等轴晶数量,减少中心碳偏析。譬如:(1)未经PMO处理的铸坯心部等轴晶的面积分数为13. 08%,而以680 A的峰值电流和90 Hz的频率PMO处理的铸坯达23. 41%,后者比前者增加了约79%;(2)未经PMO处理的铸坯心部等轴晶的面积分数为11. 74%,而以600 A的峰值电流和110 Hz的频率PMO处理的铸坯为23. 41%,后者比前者增加了1倍多。此外,经过PMO处理的铸坯的中心碳偏析指数降低0. 2以上,不超过1. 1。上述结果表明,PMO处理使锚链钢连铸坯的组织均匀性得到了显著改善。
Continuously cast rectangular billets of AM2 anchor steel,measuring 220 mm by260 mm,were fabricated. A portion of the cast billets were treated by a pulsed magneto-oscillation( PMO) technology developed by Shanghai University to improve their structural homogeneity. The results showed that the PMO treatment could eliminate central shrinkage cavity,increase amount of equiaxed grains,and reduce central carbon segregation in the cast billet,provided that parameters of the PMO was reasonable. Two examples were given as follows:( a) area fractions of equiaxed grains in the cast billet not subjected to and subjected to the PMO treatment at both peak current of 680 A and frequency of 90 Hz were respectively 13. 08% and 23. 41%,the latter was about 79% larger than the former;( b) area fractions of equiaxed grains in the cast billet not subjected to and subjected to the PMO treatment at both peak current of 600 A and frequency of 110 Hz were respectively 11. 74% and25. 24%,the latter was twice or more as large as the former. Furthermore,central carbon segregation index of the cast billets subjected to the PMO treatment decreased by more than 0. 2,not more than1. 1. The above-mentioned results indicated that the PMO treatment allowed structural homogeneity of the continuously cast billets of AM2 anchor steel to be significantly improved.
Continuously cast rectangular billets of AM2 anchor steel,measuring 220 mm by260 mm,were fabricated. A portion of the cast billets were treated by a pulsed magneto-oscillation( PMO) technology developed by Shanghai University to improve their structural homogeneity. The results showed that the PMO treatment could eliminate central shrinkage cavity,increase amount of equiaxed grains,and reduce central carbon segregation in the cast billet,provided that parameters of the PMO was reasonable. Two examples were given as follows:( a) area fractions of equiaxed grains in the cast billet not subjected to and subjected to the PMO treatment at both peak current of 680 A and frequency of 90 Hz were respectively 13. 08% and 23. 41%,the latter was about 79% larger than the former;( b) area fractions of equiaxed grains in the cast billet not subjected to and subjected to the PMO treatment at both peak current of 600 A and frequency of 110 Hz were respectively 11. 74% and25. 24%,the latter was twice or more as large as the former. Furthermore,central carbon segregation index of the cast billets subjected to the PMO treatment decreased by more than 0. 2,not more than1. 1. The above-mentioned results indicated that the PMO treatment allowed structural homogeneity of the continuously cast billets of AM2 anchor steel to be significantly improved.
引文
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[16]程勇,徐智帅,周湛,等. PMO凝固均质化技术在连铸GCr15轴承钢生产中的应用[J].上海金属,2016,38(4):54-57.
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[3] ZHONG H G,CHEN C R,HAN Q Y,et al. A thermal simulation method for solidification process of steel slab in continuous casting[J]. Metallurgical and Materials Transactions B,2016,47(5):2963-2970.
[4]干勇.薄板坯连铸及其凝固机理研究[J].钢铁研究学报,1989,2(4):89.
[5]冯远超.改善连铸重轨钢中心偏析的技术探讨[J].攀钢技术,2002,25(6):66-69.
[6]陶红标,张慧,王超,等.振动激发金属液形核技术在铸锭和板坯凝固过程中的应用[J].特殊钢,2012,33(6):18-21.
[7]幸伟.电磁技术在连铸过程中的应用与发展[J].宽厚板,2017,23(2):39-44.
[8]查显文.连铸液芯大压下轧制技术发展简述[J].中国金属通报,2016(3):63-64.
[9]林启勇,朱苗勇.钢种和断面对连铸板坯轻压下效率的影响[J].钢铁,2010,45(3):32-37.
[10]LIAO X L,ZHAI Q J,SONG C J,et al. Effects of electric current pulse on stability of solid/liquid interface of Al-4. 5wt.%Cu alloy during directional solidification[J].Materials Science and Engineering A,2007,466(1/2):56-60.
[11]LIAO X L,ZHAI Q J,LUO J,et al. Refining mechanism of the electric current pulse on the solidification structure of pure aluminum[J]. Acta Materialia,2007,55(9):3103-3109.
[12]GONG Y N,LUO J,JING J X,et al. Structure refinement of pure aluminum by pulse magneto-oscillation[J]. Materials Science and Engineering A,2008,497(1/2):147-152.
[13]翟启杰,龚永勇,高玉来,等.磁致振荡细化金属凝固组织的方法及其装置:中国,200510030736. 4[P]. 2006-04-12.
[14]王海洋,滕力宏,赵阳,等. PMO作用对连铸轴承钢凝固组织及碳化物的影响[J].连铸,2018,43(6):32-35.
[15]何西,刘宇,滕力宏,等.应用PMO技术提高齿轮钢铸坯拉速的可行性研究[J].连铸,2018,43(6):28-31.
[16]程勇,徐智帅,周湛,等. PMO凝固均质化技术在连铸GCr15轴承钢生产中的应用[J].上海金属,2016,38(4):54-57.
[17]龚永勇.脉冲磁致振荡凝固细晶技术基础研究[D].上海:上海大学,2008.