雷四雄,杨伟,郑行

• 1:株洲中航动力精密铸造有限公司
• 2:南昌航空大学轻合金加工科学与技术国防重点学科实验室

摘要(Abstract)：

研究了采用铜模喷铸制备的K424合金的组织及等温时效热处理工艺对其沉淀相析出行为的影响。结果表明,冷速的提高有利于合金枝晶组织的细化,其中二次枝晶间距由铸态时的96μm显著下降到快冷态的9μm,同时导致碳化物与共晶相的尺寸及含量降低。铜模喷铸合金经等温时效处理后,原始过饱和固溶体组织发生沉淀相析出。当时效温度为800℃时,γ′相的尺寸及体积分数均随保温时间的延长而增加,相应形貌由不规则球形向立方结构发生转变,沉淀强化效应的增强导致合金硬度不断提高。经1000℃/4 h时效处理后,铜模喷铸合金中γ′相为矩形形貌并发生明显粗化,从而引起合金硬度的下降。

关键词(KeyWords)： 非平衡凝固;时效;组织细化;沉淀相;高温合金

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51461032);; 江西省教育厅资助项目(GJJ180513)

作者(Author): 雷四雄,杨伟,郑行

DOI: 10.13289/j.issn.1009-6264.2019-0041

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