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金属学报  2023, Vol. 59 Issue (12): 1559-1567    DOI: 10.11900/0412.1961.2022.00108
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镍基单晶高温合金DD432的持久性能各向异性
张子轩1,2, 于金江1(), 刘金来1
1中国科学院金属研究所 师昌绪先进材料创新中心 沈阳 110016
2中国科学技术大学 材料科学与工程学院 沈阳 110016
Anisotropy of Stress Rupture Property of Ni Base Single Crystal Superalloy DD432
ZHANG Zixuan1,2, YU Jinjiang1(), LIU Jinlai1
1Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
引用本文:

张子轩, 于金江, 刘金来. 镍基单晶高温合金DD432的持久性能各向异性[J]. 金属学报, 2023, 59(12): 1559-1567.
Zixuan ZHANG, Jinjiang YU, Jinlai LIU. Anisotropy of Stress Rupture Property of Ni Base Single Crystal Superalloy DD432[J]. Acta Metall Sin, 2023, 59(12): 1559-1567.

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摘要: 

分别制备了偏离<001>、<011>及<111>取向的镍基单晶高温合金DD432样品,测定其在760℃、810 MPa和1000℃、280 MPa条件下的持久性能。结果表明,在760℃、810 MPa条件下3个取向的样品组织未发生明显筏化,具有明显的持久寿命各向异性,其中<111>取向样品的持久寿命最长,随着取向偏离角度的增加,持久寿命逐渐降低;<001>取向样品的持久寿命较低,且随着取向偏离角度的增大而增长;而<011>取向样品的持久性能最低,随着取向偏离角度的增加持久性能也有所提升。在1000℃、280 MPa条件下3个取向样品的组织都明显筏化,且筏化组织差异明显,持久性能各向异性有所下降但仍然存在,<111>取向样品的持久性能较<001>取向样品略好,<011>取向样品的持久性能虽然有所提升但依然最差。随着取向偏离角度的变化持久寿命仍然存在差异,但没有表现出明显的线性规律。

关键词 镍基单晶高温合金持久性能各向异性    
Abstract

Ni base superalloys have been extensively used in advanced aeroengine. With the development of modern aviation industry, high demands are being placed on the comprehensive performance of Ni base superalloys at high temperatures. To meet this demand, numerous refractory alloy elements are added to Ni base superalloys. However, in this way, the temperature bearing capacity of the alloy is enhanced, while the microstructure stability is reduced. Therefore, some scholars proposed to develop single crystal blades with various orientations through the anisotropy of a single crystal alloy. The stress rupture anisotropies of a Ni base single crystal superalloy DD432 under 760oC, 810 MPa and 1000oC, 280 MPa have been investigated in this study. The stress rupture properties of Ni base single crystal superalloy DD432 that deviated from <001>, <011>, and <111> with certain degrees were measured. It is discovered that rafting does not occur in specimens with three orientations, and the stress rupture life anisotropy of specimens is visible at 760oC and 810 MPa. Furthermore, the stress rupture life of specimens with <111> orientation is the best, and as the orientation deviation degree increases, the stress rupture life gradually decreases. The stress rupture property of specimens with <001> orientation is lower than that of specimens with <111> orientation, and the stress rupture life increases with increasing orientation deviation degree. The creep resistance of specimens with <011> orientation is the lowest, and the stress rupture property is also enhanced as the orientation deviation degree increases. Rafting occurred in all the specimens with three orientations under the conditions of 1000oC and 280 MPa, and the stress rupture property anisotropy of specimens decreased, but still existed. The stress rupture property of specimens with <111> orientation was slightly better than that of specimens with <001> orientation, and the stress rupture property of specimens with <011> orientation was still the worst, although it improved. A difference still exists in the stress rupture life as the degree of orientation deviation changes. However, there is no visible linear tendency.

Key wordsNi base single crystal superalloy    stress rupture property    anisotropy
收稿日期: 2022-03-11     
ZTFLH:  TG113.25  
基金资助:国家自然科学基金项目(51971214)
通讯作者: 于金江,jjyu@imr.ac.cn,主要从事镍基高温合金性能研究
作者简介: 张子轩,男,1994年生,硕士生
图1  <001>、<011>和<111> 3个取向镍基单晶高温合金横截面铸态组织的OM像
图2  760℃、810 MPa条件下持久寿命随取向偏离角度变化统计图
图3  1000℃、280 MPa条件下持久寿命随取向偏离角度变化统计图
SpecimenNominal
orientation
Deviation
degree / (°)
Elongation
%
1<011>1.1121
2<011>9.3926
3<011>14.3026
4<011>16.1630
5<111>10.5618
6<111>11.7120
7<111>16.5428
8<111>21.1027
9<001>11.9920
10<001>13.7023
11<001>22.0825
表1  760℃、810 MPa条件下3种取向样品拉伸蠕变的延伸率
SpecimenNominal
orientation
Deviation
degree / (°)
Elongation
%
1<011>10.4816
2<011>14.3017
3<011>16.1615
4<111>8.676
5<111>10.5614
6<111>11.7118
7<001>9.2536
8<001>11.9931
9<001>19.9935
表2  1000℃、280 MPa条件下3种取向样品拉伸蠕变的延伸率
图4  <001>、<011>和<111>取向样品的蠕变曲线
图5  1000℃、280 MPa持久样品在铸造孔洞处的裂纹扩展
图6  3种取向样品在不同条件下蠕变断裂后显微组织的SEM像
图7  <001>取向1000℃、280 MPa持久样品微裂纹形貌的SEM像
图8  <011>和<111>取向样品在不同条件下蠕变断裂位错组态的TEM像
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