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Effects of boron and zirconium additions on the fluidity, microstructure and mechanical properties of IN718C superalloy

Published online by Cambridge University Press:  21 October 2016

Ziqi Jie ,
Jun Zhang ,
Taiwen Huang ,
Haijun Su ,
Yanbin Zhang ,
Lin Liu  and
Hengzhi Fu
Ziqi Jie
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Jun Zhang*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Taiwen Huang*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Haijun Su*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Yanbin Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Lin Liu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Hengzhi Fu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
*
a) Address all correspondence to these authors. e-mail: zhjscott@nwpu.edu.cn
b) e-mail: taiwen_h@nwpu.edu.cn.
c) e-mail: shjnpu@nwpu.edu.cn
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Abstract

The effects of boron and zirconium contents from 0 to 0.049 wt% on the casting fluidity, as-cast microstructure and mechanical properties of IN718C superalloy are systematically investigated. The results show that as the B or Zr content increases, the fluidity firstly increases and then decreases. The optimum fluidity is obtained at the pouring temperature of 1470 °C when the content of B is 0.0059 wt% or Zr is 0.042 wt%, respectively. The addition of Zr can lead to the formation of blocky laves phase, but B has no influence on microstructure morphology. Furthermore, the addition of B or Zr can effectively improve the tensile and stress life properties as well as casting fluidity of IN718C superalloy. As compared with IN718C master alloys, the tensile strength can increase 6.2–8.6% and stress life can be improved by 1.3 times when B content is 0.0059 wt%. In addition, when the alloy contains 0.042 wt% Zr, the tensile strength can increase 5.6–7% and stress life can increase 1.076 times than that of the master alloy.

Keywords

minor alloyingsuperalloyfluiditymicrostructuremechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 22 , 28 November 2016 , pp. 3557 - 3566
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Copyright
Copyright © Materials Research Society 2016 

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