难变形高温合金<strong>GH4975</strong>的铸态组织及均匀化

doi:10.11900/0412.1961.2019.00429

金属学报

2020, Vol. 56

Issue (7): 988-996 DOI: 10.11900/0412.1961.2019.00429

本期目录 | 过刊浏览

难变形高温合金GH4975的铸态组织及均匀化

向雪梅, 江河(

), 董建新, 姚志浩

北京科技大学材料科学与工程学院北京 100083

As-Cast Microstructure Characteristic and Homogenization of a Newly Developed Hard-Deformed Ni-Based Superalloy GH4975

XIANG Xuemei, JIANG He(

), DONG Jianxin, YAO Zhihao

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

引用本文:

向雪梅, 江河, 董建新, 姚志浩. 难变形高温合金GH4975的铸态组织及均匀化[J]. 金属学报, 2020, 56(7): 988-996.
Xuemei XIANG, He JIANG, Jianxin DONG, Zhihao YAO. As-Cast Microstructure Characteristic and Homogenization of a Newly Developed Hard-Deformed Ni-Based Superalloy GH4975[J]. Acta Metall Sin, 2020, 56(7): 988-996.

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摘要:

应用FESEM、EBSD、萃取相分析及热模拟压缩等实验方法研究了难变形高温合金GH4975的铸态组织，铸态热压缩及均匀化过程中的组织演变。结果表明，GH4975合金铸态组织的主要析出相为γ′相、一次MC碳化物相及共晶相。合金中的主要偏析元素为Ti、Nb和W。铸态合金经热压缩后极易开裂，开裂主要由一次碳化物、共晶相及一次粗大γ′相的不协调变形导致。经1180 ℃、50 h均匀化热处理后，合金中的元素偏析完全消除。在1180 ℃均匀化过程中除共晶相回溶外，一次碳化物的数量和形态发生了明显的变化。均匀化后合金中的强化相和一次碳化物发生了综合互协调作用，使合金的热变形能力显著提高。

关键词 ： GH4975难变形高温合金, 组织特征, 均匀化

Abstract：

Alloy GH4975 is a newly developed hard-deformed Ni-based superalloy which can keep high performance at elevated temperatures. And it is expected to be applied above 850 ℃. The as-cast microstructure, hot deformation of as-cast alloy, and the microstructural evolution during homogenization of alloy GH4975 were investigated utilizing a combination of FESEM, EBSD and extractive phase analysis. The results show that the γ′ phase, primary MC carbide and eutectic phase are the main precipitates in the as-cast alloy. Alloying elements Ti, Nb and W exhibit severe microsegregation during solidification. Cracking phenomenon can be observed in the hot-deformed samples of as-cast alloy due to the incoordination deformation between matrix and the MC carbide, primary coarse γ′ phase and eutectic phase. Microsegregation of alloying elements is eliminated after heat treated at 1180 ℃ for 50 h. Furthermore, besides of the redissolution of eutectic phase, the morphologies and size of MC carbide also evolved during homogenization process. Thermoplasticity and deformability can be improved obviously after homogenization due to improvement of the coordinated deformation capacity of MC carbide and strengthening phase.

Key words： hard-deformed superalloy GH4975 microstructure characteristic homogenization

收稿日期: 2019-12-13

ZTFLH:

TG146.1

基金资助:国家自然科学基金项目(51571012)

作者简介: 向雪梅，女，1992年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00429 或 https://www.ams.org.cn/CN/Y2020/V56/I7/988

图1 铸态GH4975合金的枝晶形貌、枝晶间析出相形貌及萃取析出相粉末的XRD谱

图2 铸态GH4975合金中γ′相形貌的SEM像

图3 铸态GH4975合金DSC加热曲线

图4 铸态GH4975合金在1160 ℃进行30%变形量热压缩后内部裂纹的OM像和EBSD像

图 5 铸态GH4975热压缩试样中的碳化物形貌

图6 铸态GH4975热压缩试样中裂纹沿共晶相和粗大γ′相扩展

表1 GH4975合金1180 ℃不同时间均匀化后元素残余偏析系数

图7 GH4975合金1180 ℃均匀化过程中的枝晶形貌演化

图8 GH4975合金1180 ℃均匀化过程中的析出相演化

图9 GH4975合金1180 ℃均匀化后γ′相的SEM像

图10 GH4975合金1180 ℃、10 h均匀化后碳化物形貌

图11 不同均匀化程度的GH4975合金在1200 ℃、压缩量50%、应变速率0.1 s-1热变形的真应力-真应变曲线及铸态和均匀化态试样的宏观形貌

图12 不同均匀化程度GH4975合金样品热变形后再结晶EBSD像

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