Effect of Low Angle Grain Boundaries on Mechanical Properties of DD5 Single Crystal Ni-base Superalloy

QIN Jianchao; CUI Renjie; HUANG Zhaohui; ZHAO Jingqian; ZHANG Yipeng; ZONG Cui; CHEN Shengping

doi:10.11868/j.issn.1005-5053.2016.000127

Journal of Aeronautical Materials (Jun 2017)

Effect of Low Angle Grain Boundaries on Mechanical Properties of DD5 Single Crystal Ni-base Superalloy

QIN Jianchao,
CUI Renjie,
HUANG Zhaohui,
ZHAO Jingqian,
ZHANG Yipeng,
ZONG Cui,
CHEN Shengping

Affiliations

QIN Jianchao: National Key Lab. of High Temperature Structure Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
CUI Renjie: National Key Lab. of High Temperature Structure Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
HUANG Zhaohui: National Key Lab. of High Temperature Structure Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
ZHAO Jingqian: National Key Lab. of High Temperature Structure Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
ZHANG Yipeng: National Key Lab. of High Temperature Structure Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
ZONG Cui: National Key Lab. of High Temperature Structure Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
CHEN Shengping: National Key Lab. of High Temperature Structure Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China

DOI: https://doi.org/10.11868/j.issn.1005-5053.2016.000127
Journal volume & issue: Vol. 37, no. 3
pp. 24 – 29

Abstract

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The effects of low angle grain boundaries on the mechanical properties of second generation single crystal superalloy DD5 were investigated and the test specimens were prepared by using seeds. The results show that at 870 ℃, the yield strength and breaking strength showed no difference when the angle is below 16.1°. The elongation is higher than 15% when the angle is below 11.4°, but the elongation decreases quickly when angle is above 11.4°. At 980 ℃/250 MPa, the rupture life is higher than 130 h when the angle is below 5.1°, and decreased slowly when the angle is above 5.1°. The rupture life still remaines 85% when the angle is 14.8°. But the rupture life decreases quickly when the angle is above 14.8°.At 1093 ℃/158 MPa, the rupture life is higher than 30 h when the angle is below 5.1°, and decreases when the angle is above 5.1°.

Published in Journal of Aeronautical Materials

ISSN: 1005-5053 (Print)
Publisher: Journal of Aeronautical Materials
Country of publisher: China
LCC subjects: Technology: Motor vehicles. Aeronautics. Astronautics
Website: http://jam.biam.ac.cn/indexen.htm

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