姚志浩,董建新,张麦仓,于秋颖

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

利用光学显微镜、场发射SEM等手段,对标准热处理(1080℃×4 h/AC+845℃×24h/AC+760℃×16h/AC)后的GH864镍基合金分别在650℃和870℃进行长期时效,研究长期时效温度和时间对合金组织和性能的影响。结果表明,GH864合金在650℃时效1000 h过程中,随着时间的延长γ'相长大不明显,晶界碳化物及γ'相尺寸分布状态几乎保持不变,基体中有三次γ'相析出,随着时效时间延长硬度增加,体现了合金在该温度下良好的组织稳定性;在650℃及870℃长期时效,γ'相随温度升高及时间延长而粗化,其规律遵循L-S-W理论,且温度越高,粗化速率也越大,温度比时间的影响更为明显;在870℃温度时效3000 h过程中,γ'相急剧长大及其体积分数逐渐降低,γ'相时效后期的长大速率较初期减缓;同时,合金中的晶界碳化物逐渐溶解消失,局部位置γ'相完全溶入基体并导致复杂的合金元素反应,形成复杂组织,最终导致合金硬度下降,合金发生了明显退化。

关键词(KeyWords)： GH864合金;高温时效;显微组织;粗化速率;退化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51071017)

作者(Author): 姚志浩,董建新,张麦仓,于秋颖

DOI: 10.13289/j.issn.1009-6264.2011.10.009

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