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2222材料工程  2022, Vol. 50 Issue (9): 127-136    DOI: 10.11868/j.issn.1001-4381.2022.000105
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
Ru对第四代镍基单晶高温合金DD22长期时效组织演化的影响
赵云松1, 杨昭2, 陈瑞志3, 张剑1, 骆宇时1, 刘丽荣3,*()
1 中国航发北京航空材料研究院 先进高温结构材料重点实验室, 北京 100095
2 陆装驻北京地区航空军代表室, 北京 100041
3 沈阳工业大学 材料科学与工程学院, 沈阳 110870
Effect of Ru on microstructure evolution of the fourth generation nickel-based single crystal superalloy DD22 during long-term aging
Yunsong ZHAO1, Zhao YANG2, Ruizhi CHEN3, Jian ZHANG1, Yushi LUO1, Lirong LIU3,*()
1 Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
2 Aviation Military Representative Office of Army Equipment Department in Beijing, Beijing 100041, China
3 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
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摘要 

利用透射电镜和场发射扫描电镜研究了两种不同Ru含量(3%和5%,质量分数)的第四代镍基单晶高温合金DD22在1130 ℃长期时效过程中γ′相形貌演化、TCP相析出和界面位错网的演化情况。研究结果表明:在完全热处理后5Ru合金比3Ru合金的γ′相尺寸更小,形状更规则,γ/γ′相界面的错配度更大,高Ru含量使合金Re,Mo等元素出现反分配现象;5Ru合金在1130 ℃长期时效过程中γ′相粗化速率、溶解速率和形筏速率均低于3Ru合金;5Ru合金在长期时效1000 h后仍没有TCP相析出,而3Ru合金在时效50 h后便析出TCP相,随着长期时效时间延长,TCP相数量增多,尺寸增大;与3Ru合金相比,长期时效1000 h后5Ru合金γ′/γ界面位错网更加致密和规则;综上所述,Ru的元素反分配作用和低的扩散系数使5Ru合金比3Ru合金表现出更高的组织稳定性。

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赵云松
杨昭
陈瑞志
张剑
骆宇时
刘丽荣
关键词 DD22镍基单晶高温合金Ru含量长期时效位错网组织稳定性    
Abstract

The morphological evolution of γ′ phase, the precipitation of TCP phases and the evolution of the interfacial dislocation networks in DD22 nickel-based single crystal superalloys with different Ru contents (3% and 5%, mass fraction) were investigated by transmission electron microscopy and field emission scanning electron microscopy during long-term aging at 1130 ℃. The results show that γ′ phase of 5Ru alloy are smaller in size and more regular in shape than that of 3Ru alloy. The mismatch of γ/γ′ phases is larger in 5Ru alloy, and the high content of Ru causes the reverse distribution of elements such as Re and Mo. During long-term aging at 1130 ℃, the coarsening rate, dissolution rate and rafting rate of γ′ phase in 5Ru alloy are lower than those of 3Ru alloy. There is still no TCP phase precipitation in 5Ru alloy after long-term aging for 1000 h, while a small amount of TCP phase is precipitated in 3Ru alloy after long-term aging for 50 h. With the prolongation of long-term aging time, the number and size of TCP phases both increase. Compared with 3Ru alloy, the interfacial dislocation networks of 5Ru alloy are denser and more regular after long-term aging for 1000 h. Above all, the reverse distribution of elements and low diffusion coefficient of Ru make 5Ru alloy exhibit higher microstructural stability than 3Ru alloy.

Key wordsDD22 nickel-based single crystal superalloy    Ru content    long-term aging    dislocation networks    microstructural stability
收稿日期: 2022-02-15      出版日期: 2022-09-20
中图分类号:  TG132.3  
基金资助:国家自然科学基金项目(52001297)
通讯作者: 刘丽荣     E-mail: lrliu@sut.edu.cn
作者简介: 刘丽荣(1976—),女,教授,博士,研究方向为单晶高温合金的组织与性能控制,联系地址:沈阳市经济开发区沈辽西路111号沈阳工业大学材料科学与工程学院(110870),E-mail: lrliu@sut.edu.cn
引用本文:   
赵云松, 杨昭, 陈瑞志, 张剑, 骆宇时, 刘丽荣. Ru对第四代镍基单晶高温合金DD22长期时效组织演化的影响[J]. 材料工程, 2022, 50(9): 127-136.
Yunsong ZHAO, Zhao YANG, Ruizhi CHEN, Jian ZHANG, Yushi LUO, Lirong LIU. Effect of Ru on microstructure evolution of the fourth generation nickel-based single crystal superalloy DD22 during long-term aging. Journal of Materials Engineering, 2022, 50(9): 127-136.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2022.000105      或      http://jme.biam.ac.cn/CN/Y2022/V50/I9/127
Alloy Co Cr Mo W Al Ta Re Ru Hf Ni
3Ru 9.0 4.0 1.5 7.0 6.0 7.0 5.0 3.0 0.2 Bal
5Ru 9.0 4.0 1.5 7.0 6.0 7.0 5.0 5.0 0.2 Bal
Table 1  3Ru和5Ru单晶高温合金的名义成分(质量分数/%)
Fig.1  3Ru和5Ru合金铸态(1)及完全热处理态(2)的OM像
(a)3Ru合金;(b)5Ru合金
Fig.2  两种合金完全热处理后的γ′相形貌
(a)3Ru合金;(b)5Ru合金
Alloy Region Co Cr Mo W Al Ta Re Ru Hf Ni
3Ru γ 12.68 6.09 1.38 2.58 7.65 1.35 2.65 2.65 0.08 Bal
γ 5.42 1.93 0.72 2.37 17.16 3.53 0.27 0.27 0.06 Bal
ki 2.34 3.16 1.92 1.09 0.45 0.38 9.7 2.18 1.35 Bal
5Ru γ 11.32 5.35 1.35 2.53 8.48 1.47 2.52 3.35 0.08 57.69
γ 6.42 2.52 0.82 2.46 16.69 3.43 0.41 1.97 0.07 69.52
ki 1.76 2.12 1.64 1.03 0.51 0.43 6.15 1.70 1.09 0.82
Table 2  透射电镜能谱测量的γγ′两相成分(原子分数/%)
Alloy aγ/nm aγ/nm δ/%
3Ru 0.35986 0.35872 -0.32
5Ru 0.360161 0.35871 -0.40
Table 3  两种合金的晶格常数和γ/γ′相错配度
Fig.3  3Ru合金1130 ℃长期时效不同时间后微观组织
(a)50 h; (b)100 h; (c)200 h; (d)1000 h
Fig.4  5Ru合金1130 ℃长期时效不同时间后微观组织
(a)50 h; (b)100 h; (c)200 h; (d)1000 h
Fig.5  3Ru和5Ru合金1130 ℃长期时效不同时间后的γ′相平均尺寸(a)和体积分数(b)统计图
Fig.6  3Ru(a)和5Ru(b)合金1130 ℃长期时效100 h(1)和1000 h(2)后界面位错网形貌
Fig.7  3Ru和5Ru合金1130 ℃长期时效不同时间后TCP相析出情况
(a)3Ru合金/50 h;(b)3Ru合金/200 h;(c)3Ru合金/500 h;(d)5Ru合金/1000 h
Fig.8  3Ru合金在1130 ℃长期时效200 h后析出TCP相的形貌(a)及选区电子衍射斑点(b)
Element D0i, Ni/(m2·s-1) Qi, Ni/(kJ·mol-1) Element D0i, Ni/(m2·s-1) Qi, Ni/(kJ·mol-1)
Ni 2.26×10-4 287 Mo 1.15×10-4 281.3
Cr 5.20×10-4 289 Re 8.20×10-7 255
Co 7.50×10-5 285.1 Ru 2.48×10-4 304.4
W 8.00×10-6 264 Hf 1.80×10-4 287
Table 4  不同溶质原子在Ni中的指前因子和扩散激活能[19]
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