蒲永亮,马源,万雨莹,涂燕妮,张春艳,王家甜

• 1:兰州交通大学材料科学与工程学院
• 2:中南大学材料科学与工程学院
• 3:北京科技大学新金属材料国家重点实验室
• 4:燕山大学材料科学与工程学院

摘要(Abstract)：

利用光学显微镜、扫描电镜和X射线衍射仪等研究了GH4169合金返回料中枝晶和夹杂物的形貌、尺寸及分布特征。通过与合金新料微观组织进行对比，分析了凝固过程中返回料中枝晶的生长过程与夹杂物的形成原因。结果表明：GH4169返回料中的合金元素种类与新料基本相同，但N、O含量明显增加。返回料的凝固组织为柱状晶，生长方向为由边缘向心部生长。一、二次枝晶臂间距变化规律一致，越靠近试样中心，枝晶间距越大，枝晶间存在NbC、TiN的夹杂和Laves+NbC的两相夹杂。返回料试样从中心到边缘显微硬度呈逐渐增加的趋势，晶间存在的夹杂物对合金的硬度影响不明显。

关键词(KeyWords)： GH4169合金;返回料;组织;枝晶形貌;夹杂物

Abstract:

Keywords:

基金项目(Foundation): 甘肃省自然科学基金(20JR10RA256);; 兰州交通大学-天津大学联合创新基金(2021051);; 兰州交通大学青年科学基金项目(2019002)

作者(Author): 蒲永亮,马源,万雨莹,涂燕妮,张春艳,王家甜

DOI: 10.13289/j.issn.1009-6264.2023-0445

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