碳鋁硅在鐵液中對氮溶解速率的影響

范越文; 胡曉軍; 王鵬棟; 李遠

doi:10.13374/j.issn2095-9389.2020.03.15.s18

碳鋁硅在鐵液中對氮溶解速率的影響

doi: 10.13374/j.issn2095-9389.2020.03.15.s18

北京科技大學鋼鐵冶金新技術國家重點實驗室，北京 100083

基金項目: 國家自然科學基金資助項目(51474019)

詳細信息

通訊作者:
E-mail：huxiaojun@ustb.edu.cn

中圖分類號: TF701.2
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出版歷程
- 收稿日期: 2020-03-15
- 刊出日期: 2020-12-25

Effects of carbon, aluminum and silicon on the dissolution rate of nitrogen into molten iron

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

More Information

Corresponding author: E-mail: huxiaojun@ustb.edu.cn

摘要

摘要: 通過¹⁵N-¹⁴N同位素氣體交換技術消除液相傳質的影響，利用在線質譜分析儀測定了在1873 K下，鐵液中氮溶解的界面反應速率常數。結果表明，總流量為600～800 mL?min^?1時可以忽略氣相傳質的影響，保護氣中增加H₂的比例有利于降低鋼液中雜質元素的濃度。鐵液中加入一定量碳、鋁、硅，分析得到這三種元素對氮溶解速率是抑制的。依據本實驗的數據利用空位解離模型建立反應速率常數k_a與氧、硫、碳、鋁、硅的活度關系，吸附系數分別是K_O=0.96，K_S=9.32，K_C=0.02，K_Al=0.51，K_Si=1.16。純鐵液中氮的溶解反應表觀速率常數為k_a=4.8×10^?6 mol?m^?2?s?Pa。
- 動力學 /
- 同位素交換技術 /
- 氮溶解 /
- 速率常數 /
- 吸附系數
Abstract: Nitrogen in the steel can either improve or weaken the performance, as well as reduce product. In the flow of producing steel, it is of paramount importance to adopt some measures to restrain or promote nitrogen dissolution in controlling the nitrogen content in the final product. The dissolution of nitrogen into molten iron in 1873 K has been measured by ¹⁵N-¹⁴N isotope exchange technology and online mass spectrometer. The results show that 600?800 mL·min^?1 of gas flow rate removes the effect of gas transfer, and increasing the hydrogen content in shielding gas decreases the content of impurity element. A certain amount of C, Al or Si was added to the molten iron, and the three elements were inhibited from the nitrogen dissolution rate. Based on the values of the work and using the dissociation determining model, the reaction apparent rate constant, k_a, was built the relationship with the content of oxygen, sulfur, carbon, aluminum and silicon. The adsorption coefficients were calculated to be K_O=0.96, K_S=9.32, K_C=0.02, K_Al=0.51 and K_Si=1.16, respectively. The nitrogen dissolution reaction apparent rate constant in pure liquid iron is k_a=4.8×10^?6 mol?m^?2?s?Pa.
- kinetics /
- isotope exchange technology /
- nitrogen dissolution /
- rate constant /
- adsorption coefficient

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圖 1 實驗裝置

Figure 1. Experimental apparatus

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圖 2 速率常數與總流量關系圖

Figure 2. Rate constants as a function of flow rate

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圖 3 表觀速率常數與C、Al、Si含量關系圖

Figure 3. Apparent rate constants as a function of C, Al or Si content

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表 1 H₂比例與樣品雜質元素含量（質量分數）

Table 1. Partial pressure of H₂ and the compositions of samples

${P_{{{\rm{H}}_2}}}$	Impurity element content /%
${P_{{{\rm{H}}_2}}}$	O	C	S
4%	0.0664	0.0285	0.0011
24%	0.0275	0.0146	0.0008

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表 2 Fe?M(M:C, Al, Si)樣品成分及速率常數計算結果

Table 2. Fe?M(M:C, Al, Si)sample composition and calculated results of the rate constant

Experiments	Reaction area/ (10^?4 m²)	Sample element compositions/%					Apparent rate constants/ (10^?6mol·m^?2·s·Pa)
Experiments	A	O	N	C	S	Al or Si	k_a
Fe?C alloys	1.94	0.039	0.021	0.006	0.0005	—	3.01
	1.96	0.0694	0.0202	0.0354	0.0010	—	7.09
	2.16	0.0006	0.0204	0.0360	0.0006	—	3.55
	1.86	0.0286	0.0197	0.0545	0.0011	—	8.29
	2.30	0.0017	0.0196	0.2300	0.0007	—	4.85
	2.11	0.0361	0.0184	0.8000	0.0010	—	4.62
	2.09	0.0024	0.0129	1.7800	0.0007	—	4.01
Fe?Al alloys	2.04	0.0115	0.0204	0.0433	0.0006	0.012	4.17
	2.02	0.0009	0.0194	0.0270	0.0008	0.140	3.75
	1.96	0.0006	0.0193	0.0202	0.0005	0.370	3.44
Fe?Si alloys	2.08	0.0133	0.0203	0.0460	0.0014	0.030	0.83
	2.16	0.0086	0.0202	0.0204	0.0009	0.150	1.84
	2.27	0.0057	0.0249	0.0288	0.0010	0.380	0.32
	2.27	0.0038	0.0399	0.0175	0.0010	0.870	0.11

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表 3 1873 K活度相互作用系數e_i^j

Table 3. Activity interaction coefficient e_i^j in liquid iron alloys at 1873 K

i	j
i	O	S	C	N	Al	Si
O	?0.2	?0.133	?0.45	0.057	?3.9	?0.131
S	?0.27	?0.028	0.11	0.01	0.035	0.063
C	?0.34	0.046	0.14	0.11	0.043	0.08
N	0.05	0.007	0.13	0	?0.028	0.047
Al	?6.6	0.03	0.091	?0.058	0.045	0.0056
Si	?0.23	0.056	0.18	0.09	0.058	0.11

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