GH4730合金累积变形过程中的组织演变规律

doi:10.13251/j.issn.0254-6051.2024.04.015

金属热处理 ›› 2024, Vol. 49 ›› Issue (4): 88-94.DOI: 10.13251/j.issn.0254-6051.2024.04.015

GH4730合金累积变形过程中的组织演变规律

王成宇¹, 安腾^1,2, 谢兴飞^1,2, 吕少敏^1,2, 曲敬龙^1,2

1.北京钢研高纳科技股份有限公司, 北京 100081;
2.钢铁研究总院有限公司高温材料研究所, 北京 100081

收稿日期:2023-07-27 修回日期:2024-01-12 出版日期:2024-04-25 发布日期:2024-05-27
通讯作者: 曲敬龙,教授,E-mail:13810256459@139.com
作者简介:王成宇(1997—),男,硕士研究生,主要研究方向为镍基高温合金的热变形,E-mail:wangcycisri@163.com。

Microstructure evolution of GH4730 alloy during cumulative deformation

Wang Chengyu¹, An Teng^1,2, Xie Xingfei^1,2, Lü Shaomin^1,2, Qu Jinglong^1,2

1. Beijing GAONA Materials and Technology Co., Ltd., Beijing 100081, China;
2. Research Institute of High Temperature Materials, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2023-07-27 Revised:2024-01-12 Online:2024-04-25 Published:2024-05-27

摘要/Abstract

摘要： 为获得均匀的细晶组织,对GH4730合金进行了多次累积变形试验,并用OM、SEM和EBSD对微观组织进行分析。结果表明,随着变形次数和变形量的增加,合金的再结晶比例逐渐增大,未再结晶晶粒的尺寸和数量逐渐减小。再结晶机制以不连续动态再结晶(DDRC)为主,连续动态再结晶(CDRX)为辅,DDRX主要发生在硬取向晶粒之间,残留的未再结晶晶粒的Taylor因子普遍较大。未再结晶组织中存在大量细小的共格γ′相,较大的不共格γ′相分布在完全再结晶区域的晶界处,其尺寸为1.1~1.4 μm。随着变形次数和变形量的增加,一次γ′相逐渐变粗,面积分数显著增大,二次γ′相数量显著减少。

关键词: 不均匀组织, γ′析出相, 组织演变, 再结晶机制, 累积变形

Abstract: In order to obtain a homogeneous fine-grained microstructure, multiple cumulative deformation test for GH4730 alloy were carried out. The microstructure of the alloy after multiple cumulative deformations was analyzed by means of OM, SEM and EBSD. The results reveal that the proportion of recrystallisation gradually increases and the size and number of unrecrystallised grains gradually decrease as the deformation times and amount increase. The recrystallisation mechanism is dominated by discontinuous dynamic recrystallisation (DDRX), supplemented by continuous dynamic recrystallisation (CDRX). The DDRX occurs mainly between the hard oriented grains, and the Taylor factor of the residual unrecrystallised grains is generally larger. There is a large amount of fine coherent γ′ phase in the unrecrystallised microstructure. As the deformation times and amount increase, the primary γ′ phase becomes progressively coarser, with a significantly larger area fraction and a significantly smaller number of secondary γ′ phases.

Key words: inhomogeneous microstructure, γ′ precipitate phase, microstructure evolution, recrystallization mechanism, cumulative deformation

中图分类号:

TG132.3

王成宇, 安腾, 谢兴飞, 吕少敏, 曲敬龙. GH4730合金累积变形过程中的组织演变规律[J]. 金属热处理, 2024, 49(4): 88-94.

Wang Chengyu, An Teng, Xie Xingfei, Lü Shaomin, Qu Jinglong. Microstructure evolution of GH4730 alloy during cumulative deformation[J]. Heat Treatment of Metals, 2024, 49(4): 88-94.

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GH4730合金累积变形过程中的组织演变规律

Microstructure evolution of GH4730 alloy during cumulative deformation

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