利用电子探针等手段研究了不同Ti含量对DZ68合金凝固过程和偏析的影响.结果表明,随合金中Ti含量的增加,合金的初凝温度和终凝温度逐渐降低,凝固温度区间逐渐增大.当Ti含量达到0.55%~1.7%之间的某一值时,铸态合金中出现(γ+γ')共晶,并随Ti含量增加,(γ+γ')共晶数量增加.随合金中Ti含量的增加,W的负偏析程度显著增加,Cr由正偏析元素逐渐转变成负偏析元素.在终凝前,随合金中Ti含量的增加,凝固前沿固体中的Ti含量随凝同温度下降的平均变化速率增加,而Cr含量随凝同温度下降的平均变化速率下降.
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