铁铬铝合金电渣重熔锭内裂纹的分析和工艺改进措施

Analysis on Internal Cracks in Fe-Cr-Al Alloy Electroslag Remelting Ingot and Improved Process Measure

通过工业试验研究了铁铬铝合金(/%:0.024C,0.26Si,0.17Mn,20.1Cr,5.3Al,0.05RE)200 kg电渣重熔结晶器的结构、冷却强度、电压电流、缓冷方式等对内裂纹的影响。结果表明,通过将原结晶器底水箱改为间接水冷装置,提高进水量,将电流、电压分别由原来的5 400 A和55 V降至5 000 A和50 V以降低熔池温度,采用膨胀珍珠岩覆盖剂保温均热等措施,使电渣锭低倍组织致密均匀,无内裂纹。

The effect of structure of electroslag remehing （ESR） mold, cooling intensity, voltage, current and slow- cooling method on internal cracks of 200 kg ESR ingot of Fe-Cr-A1 alloy （/% ： 0. 024C, 0. 26Si, 0. 17Mn, 20. ICr, 5.3A1, 0. 05RE） has been studied by pilot-scale production. Results show that with the measures including modifying orig- inal mold bottom water box to indirect water cooling unit, increasing inlet water rate, decreasing voltage and current respec- tively from original 5 400 A and 55 V to 5 000 A and 50 V to lower bath temperature, and using expanding perlite shielding material for holding and soaking, the macrostructure of ESR ingot is compact and uniform, and there is no internal cracks.