EFFECT OF GRAIN BOUNDARY ANGLE ON STRESS RUPTURE PROPERTIES OF A Ni-BASED BICRYSTAL SUPERALLOY

doi:10.3724/SP.J.1037.2013.00342

Acta Metall Sin

2014, Vol. 50

Issue (1): 11-18 DOI: 10.3724/SP.J.1037.2013.00342

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EFFECT OF GRAIN BOUNDARY ANGLE ON STRESS RUPTURE PROPERTIES OF A Ni-BASED BICRYSTAL SUPERALLOY

CAO Liang, ZHOU Yizhou(

), JIN Tao, SUN Xiaofeng

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

CAO Liang, ZHOU Yizhou, JIN Tao, SUN Xiaofeng. EFFECT OF GRAIN BOUNDARY ANGLE ON STRESS RUPTURE PROPERTIES OF A Ni-BASED BICRYSTAL SUPERALLOY. Acta Metall Sin, 2014, 50(1): 11-18.

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Abstract

Bicrystal slabs with different grain boundary angles were cast to study the effect of varied grain boundary angle on stress rupture properties of a Ni-based bicrystal superalloy. It was found that the stress rupture lives of single crystal specimens were superior to those with grain boundaries. With the increase of grain boundary angle, the stress rupture life was decreased and the fracture type was transferred from trans-granular to inter-granular fracture. The reduced rupture properties was attributed to the inhabitation of grain boundary on slip deformation. With the rise of temperatures, the effect of grain boundaries on rupture properties was enhanced and the critical value of grain boundary angle from trans-granular to inter-granular fracture was decreased. Inter-granular fracture occurred from 12° grain boundary in the rupture test of 871 ℃ and 552 MPa, and it occurred from 4.5° grain boundary in the rupture test of 1100 ℃ and 120 MPa. Since the grain boundary became weaker at higher temperature, the angle of low-angle boundary in single crystal superalloys should be controlled strictly.

Key words: Ni-based superalloy grain boundary angle stress rupture property

Received: 24 June 2013

ZTFLH:

TG146

Fund: Supported by National Natural Science Foundation of China (Nos.U1037601, 51271186 and 51001103), National Basic Research Program of China (No.2010CB631206) and Program of “One Hundred Talented People” of the Chinese Academy of Sciences

About author: null

曹亮, 女, 1981 年生, 博士生

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	Liang CAO
	Yizhou ZHOU
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00342 OR https://www.ams.org.cn/EN/Y2014/V50/I1/11

Fig.1

双晶试样制备示意图

Fig.2

双晶的晶界形貌

Fig.3

晶界角度对试样持久寿命的影响

Fig.4

871 ℃和552 MPa 条件下试样持久断裂后的微观与宏观断口形貌

Fig.5

871 ℃和552 MPa 条件下试样持久断口纵截面的宏观形貌以及断口附近的微观组织

Fig.6

1100 ℃和120 MPa条件下试样持久断裂后的微观与宏观断口形貌

Fig.7

1100 ℃和120 MPa条件下试样持久断口纵截面的宏观形貌以及断口附近的微观组织

Fig.8

871 ℃, 552 MPa条件下15 h持久中断试样晶界附近的晶体取向变化

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