田宁,田素贵,于慧臣,孟宪林

• 1:沈阳工业大学材料科学与工程学院
• 2:北京航空材料研究院

摘要(Abstract)：

通过对一种定向凝固合金进行不同温度的固溶处理、蠕变性能测试及组织形貌观察,研究了固溶温度对枝晶臂/间区域的成分偏析及持久性能的影响。结果表明:经1230℃固溶及时效处理后,合金在枝晶干/间区域存在明显的成分偏析和组织不均匀性,粗大γ'相存在于枝晶间区域,细小γ'相存在于枝晶干区域,碳化物呈条状分布在枝晶间区域。合金经1260℃固溶及时效处理后,可明显降低合金中元素的偏析程度,并消除了合金在枝晶间区域存在中的粗大γ'相,使高体积分数细小立方γ'相均匀分布在枝晶间和枝晶干区域,并有细小粒状碳化物沿晶界析出,抑制晶界滑移,因此,可大幅度改善合金的中温蠕变性能。合金在中温蠕变期间的变形特征是位错在基体中滑移和剪切γ'相,并在γ'/γ两相界面形成位错网。蠕变后期,由于沿与应力轴呈45!角的晶界承受载荷的最大剪切应力,故裂纹易于在与应力轴呈45!角的倾斜晶界处萌生与扩展。

关键词(KeyWords)： 定向凝固镍基合金;固溶温度;组织结构;蠕变;变形特征;蠕变损伤

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51271125)

作者(Author): 田宁,田素贵,于慧臣,孟宪林

DOI: 10.13289/j.issn.1009-6264.2014.07.016

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