INFLUENCE OF Pt ON THE CREEP RUPTURE PROPERTIES OF Ni-BASED SINGLE CRYSTAL SUPERALLOY

doi:10.11900/0412.1961.2014.00364

Acta Metall Sin

2015, Vol. 51

Issue (1): 77-84 DOI: 10.11900/0412.1961.2014.00364

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INFLUENCE OF Pt ON THE CREEP RUPTURE PROPERTIES OF Ni-BASED SINGLE CRYSTAL SUPERALLOY

LIN Huiwen, LIU Jide(

), ZHOU Yizhou, JIN Tao, SUN Xiaofeng

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

Cite this article:

LIN Huiwen, LIU Jide, ZHOU Yizhou, JIN Tao, SUN Xiaofeng. INFLUENCE OF Pt ON THE CREEP RUPTURE PROPERTIES OF Ni-BASED SINGLE CRYSTAL SUPERALLOY. Acta Metall Sin, 2015, 51(1): 77-84.

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Abstract

The Ni-based single crystal superalloys are considered to be the major materials for advanced areo-engine blades. In order to improve the high temperature properties of Ni-based single crystal superalloys, many refractory elements are introduced into this kind of alloys. Recently Pt has been suggested to be the alloying elements of advanced Ni-based single crystal superalloys. However, there are no researches for the effects of Pt on creep rupture properties of advanced single crystal superalloys. In this work, the influence of Pt element on the creep rupture properties of a Re-containing single crystal superalloy was investigated. The high-temperature creep rupture properties of the Pt-containing Ni-based single crystal superalloy at 1100 ℃, 180 MPa and 1000 ℃, 310 MPa were investigated. The deformation microstructure and the morphology of dislocations were studied by SEM and TEM. The results show that the creep rupture life of Pt-containing superalloy decrease slightly at 1100 ℃, 180 MPa and decreased obviously at 1000 ℃, 310 MPa. The fracture models of different alloys are all ductile fracture, and many irregular microviods and microcracks can be observed in the fracture surfaces. After high temperature creep deformation, regular dislocation networks formed at the g/g' interfaces. The differences of creep rupture properties among those alloys are that Pt element may promote the formation of TCP phase, and the interface between the TCP phase and g matrix may be favorite sites of the initiation of microvoids and microcracks.

Key words: Pt Ni-based single crystal superalloy creep rupture property

ZTFLH:

TG146

Fund: Supported by National Natural Science Foundation of China (No.U1037601) and National Basic Research Program of China (No.2010CB631206)

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	Huiwen LIN
	Jide LIU
	Yizhou ZHOU
	Tao JIN
	Xiaofeng SUN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00364 OR https://www.ams.org.cn/EN/Y2015/V51/I1/77

Table 1 Nominal compositions of experimental alloys

Fig.1 Schematic of creep rupture test sample (unit: mm)

Table 2 Rupture life (t) and elongation (d) of different alloys

Fig.2 Low (a, c, e) and high (b, d, f) magnified SEM images of fracture morphologies of 0Pt (a, b), 1.5Pt (c, d) and 3Pt (e, f) alloys after rupture test at 1100 ℃ and 180 MPa

Fig.3 Low (a, c, e) and high (b, d, f) magnified SEM images of fracture morphologies of 0Pt (a, b), 1.5Pt (c, d) and 3Pt (e, f) alloys after rupture test at 1000 ℃ and 310 MPa

Fig.4 Low (a, c, e) and high (b, d, f) magnified SEM images of longitudinal microstructures of 0Pt (a, b), 1.5Pt (c, d) and 3Pt (e, f) alloys after rupture test at 1100 ℃ and 180 MPa

Fig.5 Low (a, c, e) and high (b, d, f) magnified SEM images of longitudinal microstructures of 0Pt (a, b), 1.5Pt (c, d) and 3Pt (e, f) alloys after rupture test at 1000 ℃ and 310 MPa

Fig.6 TEM images of dislocation networks configuration in 0Pt (a), 1.5Pt (b) and 3Pt (c) alloys after rupture test at 1100 ℃ and 180 MPa

Fig.7 TEM images of dislocation networks configuration in 0Pt (a), 1.5Pt (b) and 3Pt (c) alloys after rupture test at 1000 ℃ and 310 MPa (Arrows show the dislocations)

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