TY - GEN
T1 - Characteristic of skin formation using zircon- and graphite-coated mold in thin wall ductile iron fabrication
AU - Dhaneswara, Donanta
AU - Suharno, Bambang
AU - Nugroho, Janu Ageng
AU - Ariobimo, Rianti Dewi S.
AU - Sofyan, Nofrijon Bin Imam
N1 - Publisher Copyright:
© 2017 Author(s).
PY - 2017/3/17
Y1 - 2017/3/17
N2 - One of the problems in thin wall ductile iron (TWDI) fabrication is skin formation during the casting. The presence of this skin will decrease strength and strain of the TWDI. One of the ways to control this skin formation is to change the cooling rate during the process through a mold coating. In testing the effectiveness of skin prevention, the following variables were used for the mold coating i.e. (i) graphite: (ii) zirconium; and (iii) double layer of graphite-zirconium. After the process, the plates were characterized by non-etching, etching, tensile test, and SEM observation. The results showed that the average skin formation using graphite: 65 μm; zirconium: 13.04 μm; and double layer of graphite-zirconium: 33.25 μm. It seems that zirconium has the most effect on the skin prevention due to sulfur binding and magnesium locked, which then prevented rapid cooling resulting in less skin formation. The results also showed the number of nodules obtained in specimen with graphite: 703 nodules/mm2 with average diameter of 12.57 μm, zirconium: 798 nodules/mm2 with average diameter of 12.15 μm, and double layer of graphite-zirconium: 697 nodules/mm2 with average diameter of 11.9 μm and nodularity percentage of 82.58%, 84.53%, and 84.22%, respectively. Tensile test showed that the strength of the specimen with graphite is 301.1 MPa, with zirconium is 388.8 MPa, and with double layer of graphite-zirconium is 304 MPa. In overall, zirconium give the best performance on the skin formation prevention in TWDI fabrication.
AB - One of the problems in thin wall ductile iron (TWDI) fabrication is skin formation during the casting. The presence of this skin will decrease strength and strain of the TWDI. One of the ways to control this skin formation is to change the cooling rate during the process through a mold coating. In testing the effectiveness of skin prevention, the following variables were used for the mold coating i.e. (i) graphite: (ii) zirconium; and (iii) double layer of graphite-zirconium. After the process, the plates were characterized by non-etching, etching, tensile test, and SEM observation. The results showed that the average skin formation using graphite: 65 μm; zirconium: 13.04 μm; and double layer of graphite-zirconium: 33.25 μm. It seems that zirconium has the most effect on the skin prevention due to sulfur binding and magnesium locked, which then prevented rapid cooling resulting in less skin formation. The results also showed the number of nodules obtained in specimen with graphite: 703 nodules/mm2 with average diameter of 12.57 μm, zirconium: 798 nodules/mm2 with average diameter of 12.15 μm, and double layer of graphite-zirconium: 697 nodules/mm2 with average diameter of 11.9 μm and nodularity percentage of 82.58%, 84.53%, and 84.22%, respectively. Tensile test showed that the strength of the specimen with graphite is 301.1 MPa, with zirconium is 388.8 MPa, and with double layer of graphite-zirconium is 304 MPa. In overall, zirconium give the best performance on the skin formation prevention in TWDI fabrication.
UR - http://www.scopus.com/inward/record.url?scp=85017516568&partnerID=8YFLogxK
U2 - 10.1063/1.4978160
DO - 10.1063/1.4978160
M3 - Conference contribution
AN - SCOPUS:85017516568
T3 - AIP Conference Proceedings
BT - International Conference on Chemistry, Chemical Process and Engineering, IC3PE 2017
A2 - Fatimah, Is
A2 - Purwiandono, Gani
PB - American Institute of Physics Inc.
T2 - International Conference on Chemistry, Chemical Process and Engineering, IC3PE 2017
Y2 - 15 November 2016 through 16 November 2016
ER -