Precipitation of Secondary γ' Phase of DD6 Single Crystal Superalloy

被引：0

作者：

Yu Jian ^{[1
]}

Li Jiarong ^{[1
]}

Shi Zhenxue ^{[1
]}

Wang Xiaoguang ^{[1
]}

Liu Shizhong ^{[1
]}

Zhao Jinqian ^{[1
]}

机构：

[1] Beijing Inst Aeronaut Mat, Sci & Technol Adv High Temp Struct Mat Lab, Beijing 100095, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2013年 / 42卷 / 08期

关键词：

DD6; single crystal superalloy; heat treatment; fine secondary gamma' phase; stress rupture property; HEAT-TREATMENT; PRIMARY CREEP; MICROSTRUCTURE; STRENGTH;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The precipitation of secondary gamma' phase of DD6 single crystal superalloy and its influence on the stress rupture properties were investigated. The results show that fine secondary gamma' phases precipitate in the matrix channel of the alloy during furnace cooling after solution treatment. Fine secondary gamma' particles are also observed in the matrix channel of the alloy during the air cooling after primary aging of 1120 degrees C/4 h, while there is no secondary gamma' phases precipitation during furnace cooling after primary aging. Fine secondary gamma' precipitates dissolve during the secondary aging at 870 degrees C, and disappear after the secondary aging of 870 C/32 h. No secondary gamma' phases precipitate during air cooling after the secondary aging of 870 degrees C/32 h. The secondary gamma' phases in the matrix channels prohibit dislocations gliding in the matrix channel and promote the dislocation shearing of primary gamma' phases; therefore the secondary gamma' phases can decrease the stress rupture lives of DD6 alloy under 760 degrees C/785 MPa. The secondary gamma' precipitates of DD6 alloy disappear after the standard heat treatment, and the stress rupture lives of DD6 alloy are significantly improved.

引用

页码：1654 / 1658

页数：5

共 19 条

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