【摘 要】
：
设计并制备了4％W/无Ru、6％W/无Ru以及6％W/2％Ru三种镍基单晶高温合金,通过蠕变性能测试、组织形貌观察、元素分布测定以及XRD谱线测定,研究Ru对一种高W镍基单晶合金蠕变性能的影响.结果 表明,提高W含量会促进拓扑密堆相(TCP)析出,从而影响蠕变寿命,6％W/无Ru合金在1070℃/137 MPa条件下的蠕变寿命仅为58h.元素Ru可改善元素W在γ/γ两相的浓度分布,高温蠕变期间元素Ru可抑制元素W由γ相向γ相扩散.6％W/2％Ru合金经高温蠕变无TCP相析出,其在1070℃/137 MPa
【机 构】
：
营口理工学院机械与动力工程学院 营口115000;沈阳工业大学材料科学与工程学院 沈阳110870
论文部分内容阅读
设计并制备了4％W/无Ru、6％W/无Ru以及6％W/2％Ru三种镍基单晶高温合金,通过蠕变性能测试、组织形貌观察、元素分布测定以及XRD谱线测定,研究Ru对一种高W镍基单晶合金蠕变性能的影响.结果 表明,提高W含量会促进拓扑密堆相(TCP)析出,从而影响蠕变寿命,6％W/无Ru合金在1070℃/137 MPa条件下的蠕变寿命仅为58h.元素Ru可改善元素W在γ/γ两相的浓度分布,高温蠕变期间元素Ru可抑制元素W由γ相向γ相扩散.6％W/2％Ru合金经高温蠕变无TCP相析出,其在1070℃/137 MPa条件下的蠕变寿命高达383 h.三种合金在高温蠕变期间,γ相均可形成垂直于应力轴方向的筏状结构,TCP相可破坏筏状结构的连续性,导致γ/γ两相扭折程度加剧,是6％W/无Ru合金蠕变寿命较低的主要原因.
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