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电渣冶金用含氟渣系对夹杂物的影响研究

2014-11-19 15:49| 发布者: 虫儿飞| 查看: 2707| 评论: 0|来自: 中国电镜网

摘要: 本文以 MoSi2 电阻炉为熔炼设备,以电渣重熔过程常用的几种渣系与支承辊用钢进行了渣金平衡实验,分别利用金相显微镜、SEM-EDS 对不同时刻所取试样进行了数量、尺寸及形貌、成分的测定,得出 S4 渣及 S5 渣的变形渣 ...


电渣冶金用含氟渣系对夹杂物的影响研究

曹玉龙

(东北大学材料与冶金学院,辽宁 沈阳 110819

 

摘要:本文以 MoSi2 电阻炉为熔炼设备,以电渣重熔过程常用的几种渣系与支承辊用钢进行了渣金平衡实验,分别利用金相显微镜、SEM-EDS 对不同时刻所取试样进行了数量、尺寸及形貌、成分的测定,得出 S4 渣及 S5 渣的变形渣 S6 渣(即保持 S5 渣其它组元成分比例不变,将 MgO 含量提升到 13%)冶炼过程中夹杂物面积百分比相对于其它渣系均较低;在钢液凝固过程后钢中易氧化元素重新与钢中溶解[O]结合形成相应非金属夹杂物,并伴随钢液的凝固常有 TiV 的氮化物、碳化物夹杂生成,采用三七渣冶炼,终点钢样中夹杂物多成塑性夹杂,而采用五元渣系冶炼,终点钢样中夹杂物呈向塑性夹杂转变的趋势。

关键词:电渣冶金,渣金平衡,全氧含量,渣系,夹杂物

 

Influence of slag containing fluoride of electroslag metallurgy on the inclusions 

Cao Yulong

(School of materials and Metallurgy, Northeastern university , Shenyang, 110819) 

Abstract: In this paper, we used resistance furnace as the melting equipment, the experiments of the balance of slag-steel on laboratory scale were performed in the furnace using the several kinds of commonly used slags of electroslag remelting process using backup roll steel.We analyzed the inclusions percentage by optical microscopy and the morphology the composition of inclusions which were samped on different time in the sample by SEM-EDS.The following conclusions can be drawn, through the experimental research and analysis: The experimental results show that the lower area percentage of inclusions in the smelting process for S4 slag and S6 slag (which is keeping the other composition ratio constant of S5 slag but make the MgO content raise to 13%than other slag. The easily oxidized elements combine

with the dissolved [O] to form the corresponding non-metallic inclusions, and often nitrides containing Ti, V and carbides inclusions generated accompanied by the solidification of liquid steel. Results also indicate that, brittle and hard inclusions were found when S1 slag was used,however, inclusions prone to transfer to plastic inclusions when five elements slag was used.


Key Words: electroslag metallurgy, slag-steel equilibrium, total oxygen content slag,inclusions

 

1 引言

随着科学技术和现代工业的发展,对各种金属材料的需求量日益增大,对其质量和性能的要求也不断提高!基于钢中夹杂物含量及其形态对钢力学性能有很大影响,潘秀兰等人[1]对于需求不断增加的纯净钢,其研究内容之一即为严格控制钢中非金属夹杂物的数量和形态。长久以来无论是实验室研究还是现场生产,大家都致力于夹杂物的控制方面,从各种理论角度出发延伸出不同的控制方法很多都达到了一定的效果[2]。钢液、熔渣、夹杂物三者处于理论上的热力学平衡时,渣的成分与夹杂物成分趋于一致[3],因此,改变渣系的成分可以影响钢中夹杂物的成分及形态,进而影响钢的性能。电渣重熔技术作为冶炼优质钢锭的一种手段,以其优良的冶金反应条件及特殊的结晶方式有着其他炼钢方法所不能替代的优越性 [4]。李正邦等人[5]指出,电渣重熔过程提纯净化的本质主要是渣洗作用,包括渣对钢中夹杂物的吸附和溶解。直接影向精炼效果及钢中夹杂物成分的因素是渣系的成分和配比、原始夹杂物的成分及尺寸。


2 实验条件及方法

2.1 实验设备

 



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