黄彬,黄科杰,张麦仓,吕少敏,曲敬龙

• 1:北京科技大学材料科学与工程学院
• 2:北京钢研高纳科技股份有限公司
• 3:钢铁研究总院高温材料研究所

摘要(Abstract)：

以锻态GH4151合金作为研究对象，分析了不同热处理温度及保温时间对一次γ′相析出回溶规律的影响，确定进一步循环热处理的参数；进而，通过循环热处理改变一次γ′相的形态及分布，并对经循环热处理后的试样进行热压缩试验，采用电子背散射衍射(EBSD)、扫描电镜(SEM)和透射电镜(TEM)等分析一次γ′相对GH4151合金的高温变形特性及动态再结晶行为的影响。结果表明：1130℃保温15 min, GH4151合金的γ′相回溶现象比较明显，晶界处的一次γ′相分布较均匀，因此选定1130℃保温15 min作为进一步循环热处理的基本参数；随着循环热处理次数的增加，钉扎于晶界处的一次γ′相更加细小弥散圆润，在高应变速率下，合金流变应力提升显著；晶界一次γ′相的存在，使得GH4151合金在热变形过程中动态再结晶机制主要为γ′相诱导动态再结晶及连续动态再结晶。

关键词(KeyWords)： GH4151合金;一次γ′相;热变形特性;动态再结晶

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51971016);; 国家科技重大专项(J2009-VI-0006-0120)

作者(Author): 黄彬,黄科杰,张麦仓,吕少敏,曲敬龙

DOI: 10.13289/j.issn.1009-6264.2023-0571

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