DOI: https://doi.org/10.15587/1729-4061.2018.129013

Effect of heat treatment and cryogenics on hardness of ductile cast iron microstructure (FCD­50)

Suriasnyah Sabarudin, Pratikto Pratikto, Agus Suprapto, Yudy Surya Irawan

Abstract


The results of researches of possibilities of increasing the mechanical properties of pig iron with ball-bearing graphite of brand FCD-50 by the combined heat treatment are described. The scheme of multistage heat treatment, the characteristic feature of which is the operation of cooling in liquid nitrogen, is proposed. The use of such a scheme allows for increased HRC hardness characteristics. The study of the microstructure of cast iron treated with this scheme has proved the efficiency of the cryogenic heat treatment stage and determined its rational regimes.

To match or approximate the properties of steel, the mechanical properties of this ductile cast iron 50 (FCD-‎‎50) must be ‎enhanced by methods such as ACTDI (austemper cryogenic and temper Ductile Iron). In this procedure, the FCD-50 specimen is inserted into the electric kitchen heater at 350 °C ‎‎(room temperature), heated to 600 °C and held at this temperature for 45 minutes. Next, the ‎specimen is heated to 900 °C and held at this temperature for 1 hour ‎‎(temperature austenisation). Then, the specimen is placed in furnace 2 at 3,000 °C for 45 minutes ‎‎(austempering process). The specimen subsequently is cooled in ‎liquid nitrogen. In this study, additional specimens were obtained for hardness and ‎microstructure tests. The as-cast test yielded a ‎hardness value of 18.39 HRC. In the hardness test for the ACTDI process, 12 ‎hours of submersion yielded the highest hardness result of 24.25 HRC. ‎In terms of the changes in microstructure after soaking changes, the amount of perlite present in the specimen was greater than that of ferrite, and the arrangement of graphite ‎nodules was better than that of the as-cast material.‎


Keywords


FCD-50; spheroidal graphite cast iron; thermal treatment; cryogenic treatment; hardness; microstructure

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References


Andoko, Soenoko, R., Purnowidodo, A., Irawan, Y. S. (2014). The Effects of Two-StepsAustempering Heat Treatment on the Tensile Strength and Toughness of Nodular Cast Iron. Australian Journal of Basic and Applied Sciences, 8 (3), 277–282.

Andoko, Soenoko, R., Purnowidodo, A., Irawan, Y. S. (2014). The Improvement of Mechanical Properties of Nodular Cast Iron (NCI) Under Two – Step Austempering Heat Treatmen. International Journal of Applied Engineering Research, 9 (5), 541–551.

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Wang, K., Tan, Z., Gao, G., Gao, B., Gui, X., Misra, R. D., Bai, B. (2016). Microstructure-property relationship in bainitic steel: The effect of austempering. Materials Science and Engineering: A, 675, 120–127. doi: 10.1016/j.msea.2016.08.026

Stokes, B., Gao, N., Reed, P. A. S. (2007). Effects of graphite nodules on crack growth behaviour of austempered ductile iron. Materials Science and Engineering: A, 445-446, 374–385. doi: 10.1016/j.msea.2006.09.058

Hsu, C.-H., Lu, J.-K., Tsai, R.-J. (2005). Effects of low-temperature coating process on mechanical behaviors of ADI. Materials Science and Engineering: A, 398 (1-2), 282–290. doi: 10.1016/j.msea.2005.03.092

Sohi, M. H., Ahmadabadi, M. N., Vahdat, A. B. (2004). The role of austempering parameters on the structure and mechanical properties of heavy section ADI. Journal of Materials Processing Technology, 153-154, 203–208. doi: 10.1016/j.jmatprotec.2004.04.308

Trudel, A., Gagne, M. (1997). Effect of composition and heat treatment parameters on the characteristics of austempered ductile irons. Canadian Metallurgical Quarterly, 36 (5), 289–298. doi: 10.1016/s0008-4433(97)00028-1

Sertucha, J., Lacaze, J., Serrallach, J., Suárez, R., Osuna, F. (2012). Effect of alloying on mechanical properties of as cast ferritic nodular cast irons. Materials Science and Technology, 28 (2), 184–191. doi: 10.1179/1743284711y.0000000014


GOST Style Citations


The Effects of Two-StepsAustempering Heat Treatment on the Tensile Strength and Toughness of Nodular Cast Iron / Andoko, Soenoko R., Purnowidodo A., Irawan Y. S. // Australian Journal of Basic and Applied Sciences. 2014. Vol. 8, Issue 3. P. 277–282.

The Improvement of Mechanical Properties of Nodular Cast  Iron (NCI) Under Two – Step Austempering Heat Treatmen / Andoko, Soenoko R., Purnowidodo A., Irawan Y. S. // International Journal of Applied Engineering Research. 2014. Vol. 9, Issue 5. P. 541–551.

Suriansyah. Direct and Indirect Cryogenic Cooling of Gray Cast Iron (FC-20) // Research Pendidikan Tinggi (DIKTI). 2015.

Effect of Cryogenic Treatment and Temper on Characteristics of Carbide Cutting Wear on AL T-6061 / Suprapto et. al. // Research DIKTI. 2014.

Microstructure-property relationship in bainitic steel: The effect of austempering / Wang K., Tan Z., Gao G., Gao B., Gui X., Misra R. D., Bai B. // Materials Science and Engineering: A. 2016. Vol. 675. P. 120–127. doi: 10.1016/j.msea.2016.08.026 

Stokes B., Gao N., Reed P. A. S. Effects of graphite nodules on crack growth behaviour of austempered ductile iron // Materials Science and Engineering: A. 2007. Vol. 445-446. P. 374–385. doi: 10.1016/j.msea.2006.09.058 

Hsu C.-H., Lu J.-K., Tsai R.-J. Effects of low-temperature coating process on mechanical behaviors of ADI // Materials Science and Engineering: A. 2005. Vol. 398, Issue 1-2. P. 282–290. doi: 10.1016/j.msea.2005.03.092 

Sohi M. H., Ahmadabadi M. N., Vahdat A. B. The role of austempering parameters on the structure and mechanical properties of heavy section ADI // Journal of Materials Processing Technology. 2004. Vol. 153-154. P. 203–208. doi: 10.1016/j.jmatprotec.2004.04.308 

Trudel A., Gagne M. Effect of composition and heat treatment parameters on the characteristics of austempered ductile irons // Canadian Metallurgical Quarterly. 1997. Vol. 36, Issue 5. P. 289–298. doi: 10.1016/s0008-4433(97)00028-1 

Effect of alloying on mechanical properties of as cast ferritic nodular cast irons / Sertucha J., Lacaze J., Serrallach J., Suárez R., Osuna F. // Materials Science and Technology. 2012. Vol. 28, Issue 2. P. 184–191. doi: 10.1179/1743284711y.0000000014 







Copyright (c) 2018 Suriasnyah Sabarudin, Pratikto Pratikto, Agus Suprapto, Yudy Surya Irawan

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061