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Influences of heat treatment on fatigue crack growth behavior of NiAl bronze (NAB) alloy

Published online by Cambridge University Press:  29 September 2015

Yuting Lv ,
Meng Hu ,
Liqiang Wang ,
Xiaoyan Xu ,
Yuanfei Han  and
Weijie Lu
Yuting Lv
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Meng Hu
Affiliation:
School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Liqiang Wang*
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Xiaoyan Xu
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Yuanfei Han
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Weijie Lu*
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: wang_liqiang@sjtu.edu.cn
b)e-mail: luweijie@sjtu.edu.cn
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Abstract

Fatigue crack growth tests of NiAl bronze (NAB) alloy heat treated at different temper temperature after quenching at 920 °C are performed using direct current potential drop method. The influences of heat treatment on the fatigue crack growth behavior of NAB alloy are investigated. The results show that the fatigue crack growth rate (FCGR) of NAB alloy decreases with the increase of temper temperature. A few large secondary cracks are obtained as the sample is tempered at 350 °C and the secondary cracks diminish with the increase of temper temperature. With further increasing temper temperature to 550 °C, a large number of small secondary cracks are obtained, which is responsible for its lower FCGR. The as-cast NAB alloy has a lower FCGR than that tempered at 550 °C at low stress intensity factor range (ΔK) region, and the lower FCGR is attributed to the crack deflection effect of the as-cast microstructure. At high ΔK region, the crack deflection effect diminishes, which leads to the higher FCGR of as-cast sample.

Keywords

NiAl bronze (NAB)heat treatmentfatigue crack growth ratedirect current potential drop (DCPD)
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 20 , 28 October 2015 , pp. 3041 - 3048
Copyright
Copyright © Materials Research Society 2015 

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