Fatigue Crack Initiation Behavior at Intermediate Temperature under High Stress Amplitude for Single Crystal Superalloy DD413

doi:10.11901/1005.3093.2020.274

Chinese Journal of Materials Research

2021, Vol. 35

Issue (7): 510-516 DOI: 10.11901/1005.3093.2020.274

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Fatigue Crack Initiation Behavior at Intermediate Temperature under High Stress Amplitude for Single Crystal Superalloy DD413

HUANG Yaqi¹^,², WANG Dong¹, LU Yuzhang¹, XIONG Ying³, SHEN Jian¹(

)

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.AECC South Industry Company Limited, Zhuzhou 412002, China

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HUANG Yaqi, WANG Dong, LU Yuzhang, XIONG Ying, SHEN Jian. Fatigue Crack Initiation Behavior at Intermediate Temperature under High Stress Amplitude for Single Crystal Superalloy DD413. Chinese Journal of Materials Research, 2021, 35(7): 510-516.

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Abstract

The fatigue crack initiation behavior of a single crystal superalloy DD413 was investigated under high stress amplitude at intermediate temperature. The fracture surfaces and longitudinal section morphologies of the test specimens were characterized by scanning electron microscope (SEM). It was found that fatigue cracks mostly initiate from the cracked blocky carbides on the surface as well as the cracked skeleton-like carbides at subsurface. All the carbides on the surface of testing specimen crack due to the combined effect of oxidation and cyclic loading. Besides, at the subsurface of testing specimen, the carbides located on the propagation path of a micro-crack can crack as a result of oxidation and cyclic loading. The micro-crack connected to the surface in the specimen is the transportation channel of oxygen for the oxidation of the carbides at the subsurface. Carbides cracked and the micro-crack initiated at the early stage of fatigue, which induced the final failure.

Key words: metallic materials single crystal superalloy high stress amplitude carbide cracking fatigue crack initiation

Received: 06 July 2020

ZTFLH:

TG403.4050

Fund: National Natural Science Foundation of China(51631008);National Science and Technology Major Project(2017-VII-0008-0101 & 2017-VI-0003-0073);Key Deployment Projects of the Chinese Academy of Sciences(ZDRW-CN-2019-01)

About author: SHEN Jian, Tel: 13804984964, E-mail: shenjian@imr.ac.cn

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	Yaqi HUANG
	Dong WANG
	Yuzhang LU
	Ying XIONG
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https://www.cjmr.org/EN/10.11901/1005.3093.2020.274 OR https://www.cjmr.org/EN/Y2021/V35/I7/510

Table 1 Nominal composition of the superalloy used in the experiments (mass fraction/%)

Fig.1 Microstructure of the alloy before fatigue test (a) dendritic microstructure and (b) morphology and EDS result of the carbide

Fig.2 Stress amplitude as a function of the number of cycles to failure

Fig.3 Surface morphology and fracture surfaces of fatigue specimens after failure (a, c) S3; (b, d) S5

Fig.4 Longitude section morphologies of the cracked carbides on the surface at 1500 cycles (~0.1 N_f) (a) and after failure (c), EDS linear scanning results (b, d, e) of the cracked carbide as marked by the arrows in Fig.4a and Fig.4c

Fig.5 Morphology of the carbides on the surface of polished sample explored at 760℃ for 30 min without loading

Fig.6 Diagram illustrating the cracking process of MC carbide

Fig.7 Longitude section morphologies of the carbides at subsurface of the specimen (a) cracked carbide on the propagation path of micro-crack, (b) no cracked carbides located around micro-crack

Fig.8 Morphology of the micro-pore in S5 after failure

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