Prediction of Microporosity in Complex Thin-Wall Castings with the Dimensionless Niyama Criterion

Maodong Kang; Haiyan Gao; Jun Wang; Lishibao Ling; Baode Sun

doi:10.3390/ma6051789

Prediction of Microporosity in Complex Thin-Wall Castings with the Dimensionless Niyama Criterion

Materials (Basel). 2013 May 7;6(5):1789-1802. doi: 10.3390/ma6051789.

Authors

Maodong Kang¹, Haiyan Gao², Jun Wang³, Lishibao Ling⁴, Baode Sun⁵

Affiliations

¹ The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. kangmd518@sjtu.edu.cn.
² The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. gaohaiyan@sjtu.edu.cn.
³ The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. junwang@sjtu.edu.cn.
⁴ The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. nealllm@sjtu.edu.cn.
⁵ The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China. bdsun@sjtu.edu.cn.

Abstract

The dimensionless Niyama criterion was used to predict the formation of microporosity in nickel-based superalloy casting, which extended the model application from a simple plate casting to complex thin-wall superalloy casting. The physical characteristics of the superalloy were calculated by JMatPro software. The relation between the volume percentage of microporosity and the dimensionless Niyama values were constructed. Quantitative metallographic measurements of the microporosity of the practical thin-wall casting were carried out. The prediction agreed well with the experiment in general, except for some thick-wall sites in the casting.

Keywords: complex thin-wall casting; microporosity; nickel-based superalloy; prediction.