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金属学报  2015 

高钨K416B铸造镍基合金高温蠕变期间碳化物演化行为

DOI: 10.11900/0412.1961.2014.00543, PP. 458-464

Keywords: K416B镍基合金,蠕变,碳化物演化,热力学分析

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Abstract:

通过蠕变性能测试和组织形貌观察,研究了高钨K416B镍基合金高温蠕变期间析出相的演化行为.结果表明,铸态合金中g'相的尺寸不均匀,条状MC碳化物在枝晶间区域呈汉字型分布;在施加应力的高温蠕变期间,细小M6C碳化物可在形变基体中不连续析出,热力学分析认为在应力诱导作用下,元素C偏聚在应力集中处,与W等碳化物形成元素结合,促使细小M6C相自基体中析出;同时,条状MC碳化物表面形成沟槽,并逐渐分解蜕变成粒状M6C相,其中,在条状MC相表面形成的附加应力是促使MC相不断溶解和发生球化的主要原因.

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