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Effects of alloying elements on the formation of hydrogen blowholes during solidification of steel and cast iron

合金元素对钢和铸铁凝固过程氢气孔形成的影响

基本信息

批准号：
63550514
负责人：
KATO Eiichi
金额：
$ 1.34万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550514/
关键词：
Cast Iron Gas Defects Hydrogen Alloying elements ガス欠陥(ブローホール)

项目摘要

The effects of Al, Ti, Bi, Te and S on the formation of hydrogen blowholes have been investigated by the technique of solidifying molten Fe-C-Si alloys in quartz tubes. This technique was employed to control the hydrogen content in the melts immediately before solidifying and to eliminate the influence of mold conditions.First, the effects of Al, Ti, Bi, Te and S have been investigated on condition that these elements are not oxidized.The results obtained are as follows; 1.The Al addition had no influence on the blowhole formation in white iron. On the other hand, the Al Addition reduced the tendency of blowhole formation in gray iron.2.The addition of Ti had no influence on the blowhole formation in white iron.3.In the case of gray iron with Ti contents in the 0.091% to 0.108%, intermediate Al contents of 0.046% to 0.124% increased the tendency of blowhole formation and Al contents over 0.230% had no influence on the blowhole formation as compared with Ti- free samples.4.The addition of Bi, Te and S increased the tendency of blowhole formation in white iron.In addition, the molten Fe-C-Si alloys were treated with a gas mixture of H_2, Ar and H_2O by bubbling through the melts for purposes of investigating the effect of oxidation of Al in the melts. The water vapor pressure of this gas mixture was established at about 10^<-4> atm, and thermodynamic consideration indicated that only Al was oxidized by this treatment.The results of this treatment of the melts are as follows; 1.The treatment increased the tendency of blowhole formation in gray iron in the concentration range of 0.05-0.4%Al.2.The treatment had no influence on the blowhole formation in gray iron, when the concentration of Al was 0.05-0.23%Al and the concentration of Ti was 0.1%. However, a part of solidifying melts came out of quartz tubes.

采用熔融Fe-C-Si合金在石英管中凝固的方法，研究了Al、Ti、Bi、Te、S等元素对氢气泡形成的影响。首先，研究了Al、Ti、Bi、Te、S等元素在不氧化条件下对白口铸铁气孔形成的影响，结果表明：1.添加Al对白口铸铁气孔的形成没有影响；在钛含量为0.091%~0.108%的灰口铸铁中，中间Al含量为0.046%~0.124%时，与不含钛的样品相比，Al含量在0.046%~0.124%时，气孔的形成倾向增加，Al含量大于0.230%时，对气孔的形成没有影响。4.添加BiTe和S增加了白口铸铁中气孔的形成倾向。用H_2、Ar和H_2O混合气体通过熔体鼓泡的方法处理Fe-C-Si合金，以研究Al在熔体中的氧化作用。这种混合气体的水蒸气压力设定在10℃~(-4)atm左右，热力学考虑表明，这种处理只氧化Al。这种处理的结果如下：1.在浓度为0.05-0.4%Al的范围内，处理增加了灰口铸铁中气孔的形成。2.当Al浓度为0.05-0.23%Al，钛的浓度为0.1%时，处理对灰口铸铁中气孔的形成没有影响。然而，部分凝固熔体从石英管中流出。