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Al-Ca-Fe脱氧剂的研究+实验结果+分析讨论

更新时间:2016-9-2:  来源:毕业论文

Al-Ca-Fe脱氧剂的研究+实验结果+分析讨论 摘要:各种炼钢方法中通常是利用氧化法来除去钢中的大部分杂质元素和有害物质,这就使得氧化后期钢中溶入了过量的氧。过量的氧在钢液中凝固时将逐渐从钢液中析出,会形成夹杂物或气泡,严重影响钢的性能。铝脱氧效率高而且成本较低,因此钢用铝脱氧是目前使用最广泛的脱氧广泛,针对使用Al作为炼钢的脱氧剂,在实际采用Al复合金属作为脱氧剂的过程中,铝脱氧的反应产物及残留在钢中的铝常引起耐热钢的蠕变脆性,降低钢的高温强度。另外,连铸过程中易造成水口堵塞,所以要降低Al的用量,往往采用加Ca来减少纯Al的影响,本文来自六)维,论(文'网,毕业论文 www.lwfree.cn 加7位QQ324_9114找源文但是Al-Ca合金比重较低,它的使用效果比较差,所以为了提高Ca的收得率,采用加入Fe的方式来提高其收得率。本次试验拟采用制成Al-Ca-Fe合金的方式,通过混料设计制定脱氧剂配方设计方案,根据实际铝钙铁脱氧剂的粉化率及其脱氧效果获得最佳的脱氧剂配方。研究结果表明:
(1)Al-Ca-Fe合金的脱氧率为42.9%,Al-Ca合金的脱氧率为19.05%,Al(纯)的脱氧率为1.25%,说明Al-Ca-Fe合金脱氧效果也好与Al(纯)和Al-Ca合金。
(2)Al-Ca合金金相图单位夹杂物平均个数N1=0.017/um2,Al-Ca-Fe合金金相图单位平均夹杂物个数N2=0.001/um2,Al-Ca-Fe合金脱氧后的夹杂物远小于Al-Ca合金的脱氧后的夹杂物,说明Al-Ca-Fe脱氧钢后的纯净度比Al-Ca的脱氧效果好。
(3)粉化率与Al-Ca-Fe脱氧剂浓度的关系:
实验所得最佳配方为Al:Ca:Fe为30.83:19.17:50。
关键词: 脱氧剂;Al-Ca-Fe;钢
Study of Al-Ca-Fe deoxidizing agent
ABSTRACT:Various steelmaking method is usually use oxidation to remove steel in most of the impurities and harmful substances, which makes dissolved at the later stage of oxidation steel in the excess oxygen. Excessive oxygen in the molten steel solidification will gradually be separated from the liquid steel, will form a inclusion or bubbles, a serious impact on the performance of steel. High aluminum deoxidization efficiency and lower cost. Thus, the steel used aluminum deoxidation is currently used by the most extensive deoxygenation widely, for using Al as steelmaking deoxidizer, in actual use of Al clad metal as deoxidizer and deoxidation reaction products and residual aluminum in steel is often caused by creep embrittlement of the heat resistant steel, reduce steel high temperature strength. In addition, in the process of continuous casting is easy to cause the amount of nozzle clogging, so to reduce the al. Often used with CA to reduce the impact of pure Al, but the proportion of Al CA alloy is low, its use effect is relatively poor, so in order to improve the CA yield, by adding Fe to improve the yield. The test is to be made of Al-Ca-Fe alloy, through the mixture design to develop the formula design of the agent, according to the actual aluminum calcium iron powder and its effect on the efficiency of the powder to obtain the best formula. Research results show that:
(1) the rate of the Al-Ca-Fe alloy is 42.9%, the rate of Al-Ca is 19.05%, and the Al (pure) is 1.25%, which indicates that the effect of Al-Ca-Fe is better for alloy and Al (pure) and Al-Ca alloy.
(2) al CA alloy phase diagram unit inclusion average number N1=0.017/um2, Al-Ca-Fe gold alloy phase diagram unit average amount of inclusion N2=0.001/um2, Al-Ca-Fe alloys as deoxidizer inclusion far less than Al CA alloy deoxidizing inclusions, that pure clarity Al-Ca-Fe deoxidized steel after deoxidation effect than Ca.
(3)the relationship between powder and formula:
The best formula for the experiment is Al:Ca:Fe 30.83:19.17:50
.KeyWords: deoxidizing;Al-Ca-Fe;steel
目录
1.文献综述 1
1.1 非金属夹杂物对钢的机械与工艺性能