LCF behavior and life prediction method of a single crystal nickel-based superalloy at high temperature

doi:10.1007/s11465-015-0362-x

Front. Mech. Eng.

2015, Vol. 10

Issue (4) : 418-423 https://doi.org/10.1007/s11465-015-0362-x

RESEARCH ARTICLE

LCF behavior and life prediction method of a single crystal nickel-based superalloy at high temperature

Zhihua ZHANG,Huichen YU(

),Chengli DONG

Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

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Abstract

Low cycle fatigue tests were conducted on the single crystal nickel-based superalloy, DD6, with different crystallographic orientations (i.e., [001], [011], and [111]) and strain dwell types (i.e., tensile, compressive, and balanced types) at a certain high temperature. Given the material anisotropy and mean stress, both orientation factor and stress range were introduced to the Smith, Watson, and Topper (SWT) stress model to predict the fatigue life. Experimental results indicated that the fatigue properties of DD6 depend on both crystallographic orientation and loading types. The fatigue life of the tensile, compressive, and balanced strain dwell tests are shorter than those of continuous cycling tests without strain dwell because of the important creep effect. The predicted results of the proposed modified SWT stress method agree well with the experimental data.

Keywords life prediction single crystal superalloy low cycle fatigue (LCF) crystallographic orientation strain dwell

Corresponding Author(s): Huichen YU

Online First Date: 23 November 2015 Issue Date: 03 December 2015

Cite this article:

Zhihua ZHANG,Huichen YU,Chengli DONG. LCF behavior and life prediction method of a single crystal nickel-based superalloy at high temperature[J]. Front. Mech. Eng., 2015, 10(4): 418-423.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-015-0362-x
https://academic.hep.com.cn/fme/EN/Y2015/V10/I4/418

Fig.1 Representative microstructure of the superalloy

Tab.1 High-temperature LCF test matrix of the superalloy at 980 °C under the strain ratio of –1/s

Fig.2 Cyclic stress-strain response of the DD6 superalloy at 980 °C

Tab.2 Cyclic strength coefficient and cyclic strain hardening index of the DD6 superalloy at 980 °C

Fig.3 Cyclic stress response of the DD6 superalloy with [001] orientation at 980 °C

Fig.4 Fatigue life on a strain amplitude basis in different orientations at 980 °C

Fig.5 Fatigue life on a stress amplitude basis in different orientations at 980 °C

Fig.6 Fatigue life on a strain amplitude basis in different strain dwells at 980 °C

Fig.7 Fatigue life on a stress amplitude basis in different strain dwells at 980 °C

Fig.8 Experimental data vs. prediction results from the modified SWT model at 980 °C. (a) Li’s modified SWT model; (b) present modified SWT model

Tab.3 Material constants of the modified SWT model

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