Guan, Yang

Shui, Guoyan

Su, Guiqiao

Sun, Xun

Yanchun, Lou

Yu, Bo

English

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8th International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS)14–17 October 2016Seattle, Washington | Hosted by Purdue UniversitySESSION 8: POSTER, GRAND PACIFIC BALLROOMSUNDAY, OCTOBER 15, 2016Study on criterion of fabricating columnar dendrite structure DZ466 superalloy based on LMC processSun Xun; Shui Guoyan; Guan Yang; Su Guiqiao; Yu Bo; Lou Yanchun, Shenyang Research Institute of FoundryABSTRACTThe directional solidification (DS) technology of superalloy is one of the most important manufacturing technolo-gies for the industrial gas turbine (IGT), and the columnar dendrite structure and single crystal superalloy blades have been applied in IGTs at some internationally developed countries for many years, but China started up rele-vant work only in recent several years. Taking use of efficient 5/25 kg liquid metal cooling (LMC) DS apparatuses developed by Shenyang Research Institute of Foundry (SRIF) and through a method of combining DS tests with numerical simulations of temperature fields of samples, the evolution law of the relationships between the colum-nar dendrite structures and the constitutional supercooling criterion values (GL/R, GL – temperature gradient in liquid phase at front of the solid–liquid interface, and R – solidification rate) for a typical nickel-based superalloy DZ466 has been investigated. The results show that when GL/R ≥ 1.5°C h/cm2, ideal columnar dendrite struc-ture samples will be obtained and without equiaxed grains occurring in the samples. This study might provide a quantitatively computing basis for the LMC DS process design of the large-sized DZ466 nickel-based superalloy blade and contribute to avoid the misorientations or the equiaxed grains appearing in columnar dendrite structure castings.KEYWORDS: LMC directional solidification, superalloy, columnar dendrite structure, criterion

Study on criterion of fabricating columnar dendrite structure DZ466 superalloy based on LMC process

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1265&amp;context=icpns

Study on criterion of fabricating columnar dendrite structure DZ466 superalloy based on LMC process

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