单晶高温合金DD6再结晶组织及其对持久性能的影响<sup>*</sup>

doi:10.3724/SP.J.1037.2013.00561

金属学报

2014, Vol. 50

Issue (6): 737-743 DOI: 10.3724/SP.J.1037.2013.00561

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单晶高温合金DD6再结晶组织及其对持久性能的影响^*

熊继春¹, 李嘉荣¹, 孙凤礼², 刘世忠¹, 韩梅¹

1 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 北京航空材料研究院第三研究室, 北京 100095

MICROSTRUCTURE OF RECRYSTALLIZATION AND THEIR EFFECTS ON STRESS RUPTURE PROPERTY OF SINGLE CRYSTAL SUPERALLOY DD6

XIONG Jichun¹, LI Jiarong¹, SUN Fengli², LIU Shizhong¹, HAN Mei¹

1 Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095
2 The 3rd Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095

引用本文:

熊继春, 李嘉荣, 孙凤礼, 刘世忠, 韩梅. 单晶高温合金DD6再结晶组织及其对持久性能的影响^*[J]. 金属学报, 2014, 50(6): 737-743.
Jichun XIONG, Jiarong LI, Fengli SUN, Shizhong LIU, Mei HAN. MICROSTRUCTURE OF RECRYSTALLIZATION AND THEIR EFFECTS ON STRESS RUPTURE PROPERTY OF SINGLE CRYSTAL SUPERALLOY DD6[J]. Acta Metall Sin, 2014, 50(6): 737-743.

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摘要:

对单晶高温合金DD6进行表面吹砂处理, 然后分别在1100, 1200和1300 ℃保温4 h, 研究了不同加热条件下DD6合金的再结晶组织及其对持久性能的影响. 结果表明, DD6合金吹砂试样1100 ℃加热4 h形成胞状再结晶组织, 胞状再结晶晶界前沿的基体中存在大量的位错缠结, 合金的持久寿命略微降低; 1200 ℃加热4 h形成胞状再结晶与等轴再结晶同时存在的混合型再结晶组织, 合金的持久寿命降低; 1300 ℃加热4 h形成等轴再结晶组织, 等轴再结晶晶界上发现碳化物析出, 合金的持久寿命严重降低. 带有等轴再结晶组织的持久试样的断口形貌为沿晶断口, 带有胞状再结晶组织的持久试样的断口形貌为韧窝断口, 带有再结晶组织的试样裂纹起源于再结晶晶界.

关键词 ：单晶高温合金, DD6, 再结晶, 组织, 持久性能

Abstract：

The specimens of single crystal superalloy DD6 were grit blasted and heat treated at 1100, 1200, and 1300 ℃ for 4 h at vacuum atmosphere respectively, then the microstructure of recrystallized DD6 alloy and their effects on the stress rupture performance were investigated. The results showed that cellular recrystallization nucleated in grit blasted samples heat treated at 1100 ℃ for 4 h, the dislocation tangles were found in the front of cellular recrystallization grain boundary in DD6 alloy, equiaxed recrystallization grains nucleated in grit blasted samples heat treated at 1300 ℃ for 4 h, and the carbides precipitate at the equiaxed recrystallization grain boundary, while the coexistence of equiaxed recrystallization grains and cellular recrystallization, defined as mixed recrystallization, occurred in the grit blasted samples heat treated at 1200 ℃ for 4 h. The cellular recrystallization reduced the stress rupture lives of DD6 alloy slightly, and the equiaxed recrystallization reduced stress rupture lives seriously, while the reduction degree of the stress rupture lives of the mixed recrystallization was between cellular recrystallization and equiaxed recrystallization. Besides this, with increase of depth of recrystallization and stress, the stresses rupture life decreased. It was also found that the fracture surface configuration was belonging to intergranular fracture with equiaxed recrystallization samples. The characteristic of the fracture surface changed to dimple fracture with cellular recrystallization samples, at all these condition the crack nucleated on the recrystallization grain boundaries of specimens during stress rupture process.

Key words： single crystal superalloy DD6 recrystallization microstructure stress rupture property

ZTFLH:

TG132.3

作者简介: null

熊继春, 男, 1981年生, 高级工程师, 博士

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链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00561 或 https://www.ams.org.cn/CN/Y2014/V50/I6/737

图1 DD6合金吹砂试样在不同热处理温度下显微组织的SEM像

图2 胞状再结晶的TEM像及HRTEM像

图3 等轴再结晶晶界的SEM像及HRTEM像

图4 不同再结晶形态的DD6合金在980 ℃, 250 MPa及1070 ℃, 160 MPa的持久寿命

图5 不同再结晶形态的DD6合金在980 ℃, 250 MPa及1070 ℃, 160 MPa的延伸率

图6 带有再结晶的DD6合金持久试样的断口形貌及断裂处的组织

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