稀土铈对钢中含钛夹杂物析出行为的研究
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摘要
应用热力学计算软件Factsage7.0在800～1 600℃温度范围内计算了含钛夹杂物、稀土对含钛夹杂物的析出情况,并采用扫描电镜及其能谱观察和分析了不添加稀土、添加稀土的钢中含钛夹杂物尺寸、形貌变化。热力学计算与扫描电镜结果表明:添加稀土元素Ce后可以减少钢中有害元素O、S含量,钢中Ti_4C_2S_2、Ti_3O_5析出量减少,有效Ti含量增加,细小弥散的Ti(C,N)析出量增多,稀土Ce能够有效的变质钢中大尺寸,具有坚硬性棱角的TiC-AlO_3复合夹杂,将其转变为尺寸相对较小,形状为椭圆形TiC-CeAlO_3夹杂,在一定程度上减少了因其形状对钢产生的有害作用,通过对夹杂物分析比较可得,钢中添加适量稀土可以提高钢的性能。
In this paper the Factsage7.0 software had been used to calculate the precipitation of titanium-bearing inclusion in the temperature range of 800～1 600 ℃. The size and morphology of titanium-bearing inclusion of steel with/without adding rare earth had been observed by scanning electron microscopy(SEM) and energy spectrum.Thermodynamics calculation and SEM results show that adding rare earth element Ce can reduce content of harmful elements such as S and O in steel,and thus the Ti_4C_2S_2 and Ti_3O_5 precipitates can be reduced.Therefore,effective Ti content can be increased,which leading to a increasing amount of fine dispersion of Ti(C,N) precipitation.Rare earth Ce can effectively modify the large size TiC-AlO_3 compound inclusions with hard edges and corners into a relatively small size,shape is oval TiC-CeAlO_3 clip,which can reduce the harmful effect of former inclusion shape on properties of steel.
In this paper the Factsage7.0 software had been used to calculate the precipitation of titanium-bearing inclusion in the temperature range of 800～1 600 ℃. The size and morphology of titanium-bearing inclusion of steel with/without adding rare earth had been observed by scanning electron microscopy(SEM) and energy spectrum.Thermodynamics calculation and SEM results show that adding rare earth element Ce can reduce content of harmful elements such as S and O in steel,and thus the Ti_4C_2S_2 and Ti_3O_5 precipitates can be reduced.Therefore,effective Ti content can be increased,which leading to a increasing amount of fine dispersion of Ti(C,N) precipitation.Rare earth Ce can effectively modify the large size TiC-AlO_3 compound inclusions with hard edges and corners into a relatively small size,shape is oval TiC-CeAlO_3 clip,which can reduce the harmful effect of former inclusion shape on properties of steel.
引文
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[2] Shan Lingtian.Effect of titanium on steel[J].Iron Steel Vanadium Titanium,1981,2(2):88-94.(单麟天.钛在钢中的作用[J].钢铁钒钛,1981,2(2):88-94.)
[3] Yu Zongsen.Application of rare earth on steel[M].Beijing:Metallurgical Industry Press,1987.(余宗森.稀土在钢铁中的应用[M].北京:冶金工业出版社,1987.)
[4] Ye Wen,Lin Qin,Guo Shibao,et al.Effects of rare earth on microalloying of 14MnNb steel[J].Journal of University of Science and Technology Beijing,1995,17(2):159-163.(叶文,林勤,郭世宝,等.稀土对14MnNb钢的微合金化作用[J].北京科技大学学报,1995,17(2):159-163.)
[5] Yang Jun,Wang Xinhua,Gong Zhixiang,et al.Preciptation thermodynamics analysis and control of titanium nitride inclusions in extra-low oxygen wheel steel[J].Journal of University of Science and Technology Beijing,2010,32(9):1138-1143.(杨俊,王新华,龚志翔,等.超低氧车轮钢中TiN夹杂析出的热力学分析及控制[J].北京科技大学学报,2010,32(9):1138-1143.)
[6] Zheng Wan,Zhai Yong,Fu Xuehao,et al.Inclusion precipitation behaviors in Ti-containing high strength steel[J].Journal of Wuhan University of Science and Technology(Natural Science edition),2017,40(3):161-166.(郑万,瞿勇,付学好,等.含钛高强钢中夹杂物析出行为研究[J].武汉科技大学学报:自然科学版,2017,40(3):161-166.)
[7] Amer A E,Min Y K,Lee K H,et al.Effect of welding heat input on microstructure and mechanical properties of simulated HAZ in Cu containing microalloyed steel[J].Journal of Materials Science,2010,45(5):1248-1254.
[8] Chen J,Shen X J,Ji Fengqin,et al.Effect of annealing time on microstructure and mechanical properties of cold-rolled niobium and titanium bearing micro-alloyed steel strips[J].Journal of Iron & Steel Research International,2013,20(9):86-92.
[9] Zhu Xingyuan,Chen Bangwen,Zeng Jing,et al.Effect of rare earth in low sulphursteel[J].Steelmaking,1999,15(6):27-30.(朱兴元,陈邦文,曾静,等.稀土在低硫钢中的作用规律[J].炼钢,1999,15(6):27-30.)
[10] Li Wenchao.Thermo dynamics of the formation of rare earth inclusions in steel[J].Iron and Steel,1986(3):10-15.(李文超.钢中稀土夹杂物生成的热力学规律[J].钢铁,1986(3):10-15.)