研究了GH4586A镍基合金在750℃、800℃、850℃长期时效过程中室温冲击及拉伸性能与组织的关系.结果表明:合金在750℃时效1500h时析出μ相,冲击性能显著降低,不超过500h时效则有利于强度和延性的配合,750℃时效随时效时间延长冲击韧性呈线性降低.μ相在750℃×1500h后出现,8∞℃为峰值温度,850℃发生回溶.在高温长期时效碳化物类型和形貌发生变化并且对合金冲击性能产生影响.
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