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Hydrogen PickUp During Electroslag Remelting Process

JIANG Zhouhua , DONG Yanwu , LIANG Lianke , LI Zhengbang

钢铁研究学报(英文版)

The pickup of hydrogen during electroslag remelting process for several slags consisting of CaF2Al2O3CaOSiO2MgO had been investigated. The laboratoryscale remelting experiments had been carried out in open air and waterfree argon atmosphere, and then the influencing factors were analyzed. It had been found that the hydrogen content in steel varied with different slag compositions. The compositions and state of slag had significant effect on the hydrogen level in steel. Partial return slag and premelted slag could avoid the hydrogen pickup especially in the early stages of the process. However, premelted slag was the optimum state to control the hydrogen pickup in steel. Experimental results indicated that waterfree argon atmosphere was very favorable to the control of hydrogen in steel in the normal remelting period.

关键词: electroslag remelting; hydrogen; calcium fluoride; premelted slag; protective atmosphere

Segregation of Niobium During Electroslag Remelting Process

DONG Yanwu , JIANG Zhouhua , LI Zhengbang

钢铁研究学报(英文版)

Experiment was carried out after the process parameters were calculated by the model previously established. The relationship between interdendritic spacing and local solidification time (LST) mainly determined by process parameters was exposed. Furthermore, the extent of segregation was studied. The results indicate that LST and interdendritic spacing are the largest and the amount of Laves phase as a result of the niobium segregation is the highest in the center of the ingot, whereas the opposite results are obtained at the edge of ingot. The extent of element segregation and the amount of Laves phase can be reduced when appropriate parameters are used. Therefore, the duration of subsequent homogenization treatments for 718 is shortened and the alloy quality is improved.

关键词: electroslag remelting;Inconel 718;segregation;local solidification time;interdendritic spacing

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