采用真空感应熔炼和定向凝固重熔技术制备了不同Re含量的Ni基高温合金试样,分析了合金微观组织,测试了热处理后其室温拉伸和高温持久性能.结果表明:Re主要分布于γ基体中,在γ'强化相中分布很少.随着Re含量的增加,γ+γ'共晶体积分数略有增多,枝晶杆γ'细化明显.热处理后γ'立方化程度增加,共晶相含量明显减少.Re的加入显著提高了合金的事温拉伸屈服强度和高温持久寿命,但室温和高温塑性有所降低.Re主要通过固溶在γ基体中来阻碍γ'粗化,增大错配度,从而提高合金综合性能.
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