GH4706合金的动态再结晶与晶粒控制*

doi:10.11901/1005.3093.2013.960

材料研究学报

2014, Vol. 28

Issue (5): 362-370 DOI: 10.11901/1005.3093.2013.960

本期目录 | 过刊浏览

GH4706合金的动态再结晶与晶粒控制*

黄烁^1,²,王磊¹(

),张北江²,张文云²,赵光普²

1. 东北大学材料各向异性与织构教育部重点实验室沈阳 110819
2. 钢铁研究总院高温材料研究所北京 100081

Dynamic Recrystallization Behavior and Grain Size Control of GH4706 Superalloy

Shuo HUANG^1,²,Lei WANG^1,^**(

),Beijiang ZHANG²,Wenyun ZHANG²,Guangpu ZHAO²

1. Key Lab for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819
2. Department of High-temperature Materials, Central Iron and Steel Research Institute, Beijing 100081

引用本文:

黄烁,王磊,张北江,张文云,赵光普. GH4706合金的动态再结晶与晶粒控制*[J]. 材料研究学报, 2014, 28(5): 362-370.
Shuo HUANG, Lei WANG, Beijiang ZHANG, Wenyun ZHANG, Guangpu ZHAO. Dynamic Recrystallization Behavior and Grain Size Control of GH4706 Superalloy[J]. Chinese Journal of Materials Research, 2014, 28(5): 362-370.

全文: PDF(8391 KB) HTML

摘要:

采用双锥压缩实验结合有限元数值模拟, 研究了变形温度、变形量对GH4706合金动态再结晶(DRX)与η相的影响, 分析了发生DRX的临界条件, 探讨了利用η相细化晶粒的方法。结果表明: GH4706合金DRX机制为应变诱发的不连续原始晶界弓出; 临界DRX温度(T_DRX)为975℃, 而临界变形量(ε_DRX)则取决于变形温度与变形生热。由于η相的溶解温度近于T_DRX, 当合金在略低于T_DRX温度变形时, 有部分η相残留, 具有阻碍亚晶界或晶界迁移的效果。由此, 对GH4706合金在变形温度低于T_DRX条件下进行大变形, 可利用η相与再结晶的交互作用, 细化合金晶粒。

关键词 ：金属材料, GH4706合金, 双锥试样, 显微组织, 动态再结晶

Abstract：

The influence of deformation temperature and strain on the microstructure of GH4706 superalloy was studied by means of double-cone samples compression combined with finite element numerical (FEM) simulation. The results show that the dynamic recrystallization (DRX) mechanism of GH4706 superalloy is a discontinuous process associated with a strain induced grain boundaries bulging leading to the formation of nuclei. It is found that the critical temperature (T_DRX) is 975℃, while the critical strain (ε_DRX) of DRX depends on both the solve of η phase and deformation generating heat. When the deformation temperature is slight lower than the T_DRX, η phase will be partially retained in the alloy, which then hinders the migration of sub-grain or grain boundaries. Therefore, finer grain of GH4706 superalloy can be obtained by deforming with a larger strain at a temperature below T_DRX.

Key words： metallic materials GH4706 alloy double cone sample microstructure dynamic recrystallizaiton

收稿日期: 2013-12-19

基金资助:* 国家高技术研究发展计划ss2012AA030801, 国家重点基础研究发展计划2010CB631203, 大飞机关键构件成型共性技术研究2012ZX04010-081资助项目。

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图1 GH4706合金棒材的宏观组织与双锥试样实物图

图2 GH4706合金双锥试样950℃条件下的热变形数值模拟结果

图3 双锥试样在950℃与1010℃下变形后的低倍组织及变形量分布(对应图2a方框)

图4 双锥试样在950℃与1010℃条件下变形后不同区域的高倍组织

图5 变形温度、变形量对DRX分数与晶粒尺寸的影响

图6 950℃与980℃临界变形量条件下的典型显微组织

图7 GH4706合金DRX临界变形量随温度的变化曲线

图8 950℃变形量为0.2与1.0条件下的典型SEM与TEM像

图9 变形量与变形温度对η相含量的影响

图10 变形量为1.0时变形温度与DRX晶粒尺寸的关系

图11 变形温度、变形量对标准热处理后平均晶粒尺寸的影响

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