CAJ | 학술논문

为了优化工艺参数和实现定向凝固,计算不同参数条件下的冷坩埚连续熔化与定向凝固TiS0Al(摩尔分数,％)合金的温度场.模型中的连续铸造通过识别运动单元的不同位置而实现.结果表明,在功率为52 kW和抽拉速度为3.0 mm/min时, 送料棒在200 s时可以完全熔化,在300 s时具有一定的过热度.当功率为52 kW时,随着抽拉速度从1.2 mm/min加快到6.0 mm/min,送料棒的过热度和熔区都减小,并且固-液界面变凹,其中在6.0 mm/min时,送科棒不能被完全熔化.当抽拉速度为3.0 mm/min时,随着功率从48 kW增加到58kW,固-液界面位置变低且变凹,当功率为48 kW时,送料棒不能被完全熔化.当抽拉速度和功率配合恰当时,可以实现冷坩埚连续熔化与定向凝固TiAl合金.
위료우화공예삼수화실현정향응고,계산불동삼수조건하적랭감과련속용화여정향응고TiS0Al(마이분수,％)합금적온도장.모형중적련속주조통과식별운동단원적불동위치이실현.결과표명,재공솔위52 kW화추랍속도위3.0 mm/min시, 송료봉재200 s시가이완전용화,재300 s시구유일정적과열도.당공솔위52 kW시,수착추랍속도종1.2 mm/min가쾌도6.0 mm/min,송료봉적과열도화용구도감소,병차고-액계면변요,기중재6.0 mm/min시,송과봉불능피완전용화.당추랍속도위3.0 mm/min시,수착공솔종48 kW증가도58kW,고-액계면위치변저차변요,당공솔위48 kW시,송료봉불능피완전용화.당추랍속도화공솔배합흡당시,가이실현랭감과련속용화여정향응고TiAl합금.
In order to optimize technological parameters and realize directional solidification,temperature fields of cold crucible continuous melting and directional solidifying Ti50Al (mole fraction,％) at different parameters were calculated.Continuous casting of the model is achieved by distinguishing the moving unit at different positions.The calculation results show that the feeding rod is entirely melted at 200 s,the melt of feeding rod has some superheat degree at 300 s under the conditions of 52 kW and 3.0 mm/min.Both the superheat degree and the molten zone of the feeding rod reduce,the solid-liquid interface becomes concave with increasing velocity from 1.2 mm/min to 6.0 mm/min when the power is 52 kW,and the outside layer of the rod cannot be melted at the velocity of 6.0 mm/min.Both superheat degree and the molten zone of the feeding rod increase,the solid-liquid interface descends and becomes concave with increasing power from 48 to 58 kW at velocity of 3.0 mm/min,and the rod cannot be melted entirely when the power is 48 kW.Cold crucible continuous melting and directional solidification of TiA1 alloys will be achieved successfully when the pulling velocity and the power are matched appropriately.