Tension-Compression Asymmetry of Single Crystal Superalloy DD10 under Low Cycle Fatigue Deformation

doi:10.11901/1005.3093.2014.012

Chinese Journal of Materials Research

2014, Vol. 28

Issue (7): 535-540 DOI: 10.11901/1005.3093.2014.012

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Tension-Compression Asymmetry of Single Crystal Superalloy DD10 under Low Cycle Fatigue Deformation

Zhidong FAN^1,²,Dong WANG^1,^**(

),Langhong LOU¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. University of Chinese Academy of Sciences, Beijing 100049

Cite this article:

Zhidong FAN,Dong WANG,Langhong LOU. Tension-Compression Asymmetry of Single Crystal Superalloy DD10 under Low Cycle Fatigue Deformation. Chinese Journal of Materials Research, 2014, 28(7): 535-540.

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Abstract

The main objective of the present research aims at investigating effects of the cyclic number, temperature and strain amplitude on the tension-compression asymmetry behavior of single crystal (SX) superalloy DD10. Fully reversed LCF tests with R_ε=-1 are conducted at 760℃ and 980℃ under various strain ranges, and some tests are interrupted after the 1st cycle and at the cyclic stress saturation stage to figure out the evolution of the tension-compression asymmetry and the dislocation configurations. Results show that this asymmetry behavior is affected by several factors, such as the stress field in matrix, temperature and the strain range, and these factors depict various effects in different parts of the LCF process. In the 1st cycle, the K value (the ratio of s_t to s_c) is slightly above 1 in low strain range for both temperatures, due to the compress in matrix resulted from the negative lattice mismatch. With the increment of strain amplitude or cyclic number, the tension-compression asymmetry gets much severer: at 760℃ the K is above 1, whereas at 980℃ K is below 1. TEM observations reveal that this distinct asymmetry behavior arises mainly from the different motion modes of dislocations in γ′ phase, e.g. perfect dislocations at 760℃ and stacking fault at 980°C.

Key words: metallic materials single crystal superalloy low cycle fatigue asymmetry dislocations

Received: 12 January 2014

Fund: *Supported by National Basic Research Program of China No. 2012AA03A513 and National Natural Science Foundation of China Nos. 51101160 & 51171193.

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	Zhidong FAN
	Dong WANG
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https://www.cjmr.org/EN/10.11901/1005.3093.2014.012 OR https://www.cjmr.org/EN/Y2014/V28/I7/535

Fig.1 Microstructure of the DD10 superalloy after heat treatment observed by optical microscope (a) and scanning electron microscope (SEM) (b)

Fig.2 Cyclic stress response curves of the DD10 superalloy at 760℃ (a) and 980℃ (b)

Fig.3 Tension-compression stress asymmetry of the DD10 superalloy at the 1st cycle (a) and the stage of stress saturation (b)

Fig.4 Dislocation configurations of the DD10 superalloy after the 1st cyclic loading (a) 760℃, ∆ε_total/2=0.7%; (b) 760℃, ∆ε_total/2=1.2%; (c) 980℃, ∆ε_total/2=0.4%; (d) 980℃, ∆ε_total/2=1.2%

Fig.5 Illustration of the stresses field in matrix to be expected when the misfit is negative

Fig.6 Dislocations configuration for specimens at cyclic stress saturation (a) 760℃, ∆ε_total/2=0.7%; (b) 980℃, ∆ε_total/2=0.4%

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