11:30 a.m. - 12:00 p.m.
Paper No. 5
Combining Laser Flash Method and Inverse Method to Develop a Thermal Property Database for Investment Shellmold Materials Von L. Richards, Mingzhi Xu, Missouri University of Science and Technology Reliable and realistic thermal properties data for investment casting shell molds are required to correctly simulate solidification and predict shrinkage. Investment casting shells exhibit several phase transformations during firing and pouring which affect their transient thermal properties. Due to phase transformation kinetics, these properties are dependent upon time, temperature and process history. This study presents the thermal properties (thermal conductivity and specific heat capacity) of seven industrially produced ceramic molds using an inverse method in which pure Ni was poured into ceramic molds equipped with two thermocouples (inside the mold cavity and in the shell). A new procedure for laser flash thermal property measurement was used as an initial point for the inverse method optimization. MAGMASOFT® software was used to simulate virtual cooling curves which were fitted to experimental curves by adjusting the temperature dependent thermal properties of the ceramic mold. The thermal properties data obtained from the inverse method were compared with measurement results from laser flash and the differences were discussed. The significance of the differences in property data is assessed by comparing simulation results between widely differing property data sets.
FENICO
12:00 p.m. - 12:15 p.m. 12:15 p.m. - 12:30 p.m.
2014 CASTING CONTEST AWARDS
2014 INTERN SCHOLARSHIP AWARDS
Presentation of the 2014 Intern Scholarships awards and presentation of the Hank and Laurie Harvey Scholarship. Russ Rosmait, Pittsburg State University
12:30 p.m. - 1:30 p.m. 1:30 p.m. - 6:00 p.m.
7:00 a.m. - 6:00 p.m. 8:00 a.m. - 8:10 a.m. 8:10 a.m. - 8:40 a.m.
LUNCH EXPO
TUESDAY, OCTOBER 7, 2014 REGISTRATION
INTRO **** Technical Conference Paper No. 6
Comparison of Directionally Solidified Samples Solidified Terrestrially and Aboard the International Space Station Samuel Angart, R.G. Erdman, David R, Poirier, The University of Arizona; S.N. Tewari, Cleveland State University; R. Grugel, Marshall Space Flight Center
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• Commercial casting from ounces to 200 lbs. • Wide range of alloys (iron base such as stainless & carbon steels, nickel & cobalt base alloys, copper-base & aluminum alloys
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Iron, Nickel, Cobalt, Copper Base and Aluminum investment castings. Contact us with your requirements or send us your file/drawing to
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Website:
www.fenicocastings.com October 2014 ❘ 25 ®
This is a report on research under the aegis of NASA on a collaboration between ESA and NASA for solidification experiments on the International Space Station (ISS). The focus has been on the effect of convection on the microstructural evolution in the directional solidification (DS) of alloys, including experiments, in which Al-7 wt.% Si is the subject alloy, have been carried out under well defined processing conditions. By comparing the microstructures in terrestrially-processed samples and ISS-processed samples, researchers have observed that the primary dendrite arm spacings of two samples grown in the low-gravity environment of the ISS show good agreement with a dendrite-growth model based on diffusion controlled growth. The gravity driven convection (i.e., thermosolutal convection) in terrestrially grown samples has the effect of decreasing the primary dendrite arm spacings and causes macrosgregation. In order to process DS-samples aboard the ISS, dendritic-seed crystals have to partially remelted in a stationary thermal gradient before the DS is carried out.
Microstructural changes and macrosegregation
effects during this period are described. 8:40 a.m. - 9:10 a.m.
Vacuum Continuously Cast Superalloys: A World’s First Richard George, Ross & Catherall
Ross and Catherall has a long history in the manufacture of alloys for the automotive, IGT and aerospace sectors.
A project was
initiated to develop a fully vacuum sealed continuous casting method for the production of superalloys.
The process has now been
developed to realize the benefits to the investment caster of improved cleanliness, minimal surface defect rectification, significantly reduced contamination through central pipe elimination and increased ingot use weight/length capability. With many alloys now in commercial production, developments are progressing to continuously cast aerospace alloys, including single crystal alloys.
Paper No. 7
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