王资兴,郑丹丹,王磊

• 1:东北大学材料各向异性与织构教育部重点实验室
• 2:宝山钢铁股份有限公司研究院
• 3:中国科学院金属研究所高温合金部

摘要(Abstract)：

研究了经标准热处理的真空感应+电渣重熔+真空自耗三联工艺冶炼IN718合金细晶250 mm棒材在650℃下长期时效过程中组织和性能的变化。结果表明:时效1000~5000 h后,晶粒度未发生明显变化,但γ″相逐渐粗化,晶界δ相附近的γ″相贫化区逐渐加宽;时效4000 h时,晶内析出部分针状δ相;达5000 h时,在晶内析出魏氏体状δ相;经长期时效后合金室温和650℃拉伸性能变化不明显;合金持久寿命在时效2000 h内亦无明显变化,超过3000 h后,合金持久寿命则明显的降低,5000 h时合金持久寿命降低了近40%;添加的0.010%P元素,能显著降低Nb元素的扩散系数,从而降低强化相γ″相的长大速率,延缓γ″相向δ相转变,有效地抑制了长期时效后合金的拉伸和持久性能的衰减。

关键词(KeyWords)： IN718合金;三联冶炼;长期时效

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(U1708253)

作者(Author): 王资兴,郑丹丹,王磊

DOI: 10.13289/j.issn.1009-6264.2018-0105

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