<strong>GH4720Li</strong>合金毫米级粗大晶粒热变形获得均匀等轴晶粒的可行性及工艺控制

doi:10.11900/0412.1961.2020.00415

金属学报

2021, Vol. 57

Issue (10): 1309-1319 DOI: 10.11900/0412.1961.2020.00415

研究论文

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GH4720Li合金毫米级粗大晶粒热变形获得均匀等轴晶粒的可行性及工艺控制

刘超, 姚志浩(

), 江河, 董建新

北京科技大学材料科学与工程学院北京 100083

The Feasibility and Process Control of Uniform Equiaxed Grains by Hot Deformation in GH4720Li Alloy with Millimeter-Level Coarse Grains

LIU Chao, YAO Zhihao(

), JIANG He, DONG Jianxin

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

刘超, 姚志浩, 江河, 董建新. GH4720Li合金毫米级粗大晶粒热变形获得均匀等轴晶粒的可行性及工艺控制[J]. 金属学报, 2021, 57(10): 1309-1319.
Chao LIU, Zhihao YAO, He JIANG, Jianxin DONG. The Feasibility and Process Control of Uniform Equiaxed Grains by Hot Deformation in GH4720Li Alloy with Millimeter-Level Coarse Grains[J]. Acta Metall Sin, 2021, 57(10): 1309-1319.

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摘要:

为了阐明GH4720Li合金毫米级粗大晶粒再结晶和塑性协调的可行性，对毫米级晶粒的GH4720Li试样在不同的变形参数下(变形温度为1130、1160和1190℃，应变速率为0.001、0.01、0.1和1 s^-1，工程应变为50%)的热变形行为进行研究，并与细晶GH4720Li合金的热变形行为进行对比。结果表明，具有毫米级粗大晶粒的GH4720Li试样对变形温度更加敏感，且在1160~1190℃、0.001~0.01 s^-1的范围内可以获得完全再结晶组织，但综合考虑再结晶和热变形塑性的控制范围后，确定毫米级粗晶GH4720Li合金应在适中的变形温度下以较低的应变速率进行热变形才能获得均匀的等轴晶组织且不开裂，较好的变形工艺为1160℃、0.01 s^-1。

关键词 ：镍基高温合金, GH4720Li合金, 热变形, 再结晶

Abstract：

For nickel-based GH4720Li superalloys, fine-grained structures can be obtained via hot deformation in a two-phase area. However, obvious recrystallized grains' coarsening occurs because of the lack of prime γ' pinning grain boundary when hot deformation occurs in a single-phase area. Much attention is directed to the hot deformation of GH4720Li alloys with fine grains. Moreover, several studies have reported the hot deformation behavior of coarse-grained GH4720Li alloys, with maximum grain sizes of several hundred microns. However, only a few studies report about the hot deformation of GH4720Li alloy with millimeter-level coarse grains. Coarse grains recrystallize incompletely and can reduce the hot deformation plasticity of GH4720Li alloy. Thus, to clarify the coordination feasibility between recrystallization and the hot deformation plasticity of GH4720Li alloy with millimeter-level coarse grains, the hot deformation behavior of GH4720Li alloy with millimeter-level coarse grains was investigated under different deformation parameters (deformation temperature of 1130, 1160, and 1190°C; strain rates of 0.001, 0.01, 0.1, and 1 s^-1; and engineering strain of 50%) and compared with the hot deformation behavior of fine-grained GH4720Li alloy. The results show that the GH4720Li sample with millimeter-level coarse grains is more sensitive to the deformation temperature, but the fine-grained GH4720Li alloy is more sensitive to strain rate. The completely recrystallized structure of the GH4720Li sample with millimeter-level coarse grains can be obtained in the range of 1160-1190°C and 0.001-0.01 s^-1. However, a meager strain rate can cause an undesirable and obvious grain growth. After comprehensively combining the recrystallization control range and the hot deformation plasticity of millimeter-level coarse-grained GH4720Li alloy, it was found that the millimeter-level coarse-grained GH4720Li alloy should be thermally deformed at a moderate deformation temperature and a reduced strain rate of 1160^oC and 0.01 s^-1, respectively, to obtain the uniform equiaxed grains structure without cracking, and better deformation.

Key words： nickel-based superalloy GH4720Li alloy hot deformation recrystallization

收稿日期: 2020-10-23

ZTFLH:

TG146.1

基金资助:国家自然科学基金项目(51771016)

作者简介: 刘超，男，1994年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00415 或 https://www.ams.org.cn/CN/Y2021/V57/I10/1309

图1 GH4720Li合金细晶样品和粗晶样品的晶粒组织

图2 细晶和粗晶GH4720Li合金试样在应变速率0.001和1 s-1下变形时的真应力-真应变曲线

图3 细晶和粗晶GH4720Li合金试样不同变形条件下的峰值应力

图4 细晶和粗晶GH4720Li合金试样的应变速率敏感因子m

图5 变形温度对GH4720Li合金细晶试样和粗晶试样热变形的影响

图6 细晶和粗晶GH4720Li合金试样在1130℃以不同应变速率变形后的再结晶组织

图7 细晶和粗晶GH4720Li合金试样在1190℃以不同应变速率变形后的再结晶组织

图8 粗晶GH4720Li合金试样在1160℃、0.01 s-1和1160℃、0.1 s-1变形后的再结晶组织

图9 粗晶GH4720Li合金试样的再结晶体积分数分布图

图10 粗晶和细晶GH4720Li合金试样开裂程度图

图11 粗晶GH4720Li合金试样在1190℃、0.01 s-1条件下变形后裂纹周围的组织特征

图12 细晶GH4720Li合金试样的热加工工艺控制范围

图13 粗晶GH4720Li合金试样的热加工工艺控制范围

图14 初始晶粒尺寸对GH4720Li合金热加工工艺控制范围的影响(a) d = 1768 μm (b) d = 1077 μm (c) d = 7.5 μm

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