在对颗粒强化理论和位错蠕变理论进行回顾、评价基础上,发展了一个位错蠕变阻力模型,认为蠕变阻力是影响铸造镍基高温合金蠕变机制的重要因素.当施加应力足以使位错切入γ'相时,主要蠕变机制是位错切割γ'相过程,蠕变阻力就是位错切入γ'相的临界门槛应力.在低施加应力区,位错只能借助于热激活攀移过程通过γ'相.蠕变阻力包括两部分:第一项是位错攀移临界门槛应力,与施加应力无关;第二项是与施加应力有关的阻力项,代表了其他强化机制的贡献.位错攀移机制蠕变阻力的上限是切割机制门槛应力.在3种铸造镍基高温合金中(定向凝固DZ17G合金,IN100合金和IN738合金),对上述模型进行了验证,理论计算应用了SL强化理论,与实测值符合较好.
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