【摘 要】
：
通过热处理、蠕变性能测试和组织形貌观察,研究了稀有元素Re对GH4169合金微观组织及蠕变性能的影响。结果表明:元素Re的添加对γ’相筏状组织起到细化作用,可促使δ相沿晶界
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通过热处理、蠕变性能测试和组织形貌观察,研究了稀有元素Re对GH4169合金微观组织及蠕变性能的影响。结果表明:元素Re的添加对γ’相筏状组织起到细化作用,可促使δ相沿晶界析出抑制晶界滑移,可提高合金显微硬度。经过固溶和时效处理后合金组织细化明显,短针状δ相和长条状MC型碳化物减少。在蠕变期间,δ相的数量会影响合金的断裂方式。元素Re的添加可提高合金的高温蠕变性能。
The effect of rare element Re on the microstructure and creep property of GH4169 alloy was studied by heat treatment, creep test and microstructure observation. The results show that the addition of element Re plays the role of refining γ ’phase raft structure, which can promote the precipitation of δ phase along the grain boundary to suppress the grain boundary slip and improve the microhardness of the alloy. After the solution treatment and aging treatment, the microstructure of the alloy is obviously refined. The short acicular δ phase and the elongated MC type carbide decrease. During creep, the amount of δ phase affects the fracture mode of the alloy. The addition of elemental Re can improve the high temperature creep properties of the alloy.
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