INFLUENCE OF AUSTEMPERING TIME AND AUSTEMPERING TEMPERATURE IN MICROSTRUCTURE AND MECHANICAL PROPERTIES IN AUSTEMPERED DUCTILE IRON

Authors

DOI:

https://doi.org/10.29121/granthaalayah.v8.i6.2020.419

Keywords:

Austempered Ductile Iron (ADI), Austempering Time, Austempering Temperature, Microstructure, Hardness, Impact

Abstract [English]

Austempered Ductile Iron (ADI) has excellent mechanical properties related to its microstructure ausferrite, and with the cycle of austempering heat treatment, many mechanical properties can be obtained from the same alloy, simply changing the time and temperature. To evaluate the influence of austempering time and temperature on the ADI, analyzed the modifications in the microstructures and mechanical properties of the samples of ductile iron, subjected to austempering heat treatment with austenitizing time and temperature of 910 °C and 90 minutes and during the austempering bath, the samples were submitted to different temperatures, 300, 320, 340, 360 e 380 °C, and for four different times for each temperature, 75, 110, 145 and 180 minutes. For the microstructural analysis, the microscopic techniques were used: optical and scanning electron and mechanical properties were obtained by mechanical testing of hardness and impact. The results show that there is a relationship between austempering temperature with microstructure and mechanical properties. The highest retained austenite and energy absorbed were 25.73% and 130 J, respectively, for the austempered sample at 380 °C and 180 minutes and the highest hardness value was 458 HB for the austempered sample at 300 °C and 75 minutes.


 

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References

Alves, V. C. C. et al. Correlation between Microstructure and Mechanical Properties of Austempered Ductile Irons. Materials Science Forum. 925, 2018, 203 – 209. DOI: https://doi.org/10.4028/www.scientific.net/MSF.925.203

Donnini, R. et al. Assessment of the Microstructure Evolution of an Austempered Ductile Iron During Austempering Process Through Strain Hardening Analysis. Metals and Materials International. Vol 3, No 5, 2017, 855 – 864. DOI: https://doi.org/10.1007/s12540-017-6704-y

Panneerselvam, S. et al. An Investigation on the Stability of Austenite in Austempered Ductile Cast Iron (ADI), Materials Science & Engineering A. 626, 2014, 237 – 246. DOI: https://doi.org/10.1016/j.msea.2014.12.038

Wadageri, C. S., Kurahatti, R.V. Review of Enhancement in Mechanical Properties using Austempered Ductile Iron (ADI). International Journal of Advanced Engineering Research and Science. Vol 3, 2016, 2349 – 6495.

Zhang, J. et al. Microstructure and mechanical properties of austempered ductile iron with different strength grades. Materials Letters. 119, 2014, 47 – 50. DOI: https://doi.org/10.1016/j.matlet.2013.12.086

Kim, Y. J. et al. Investigation into mechanical properties of austempered ductile cast iron (ADI) in accordance with austempering temperature. Materials Letters 62, 2007, 357-360. DOI: https://doi.org/10.1016/j.matlet.2007.05.028

Putatunda, S. K. et al. Development of Austenite Free ADI (Austempered Ductile Cast Iron). Materials Science and Engineering A 435-436, 2006, 112 – 122. DOI: https://doi.org/10.1016/j.msea.2006.07.051

American Society for Testing and Materials – ASTM. Standard Specification for Austempered Ductile Iron Castings. ASTM. A897M /A897M – 15. 2015.

Voigt, R. C. Austempered Ductile Iron – Processing and Properties, Cast Metals. 2:2, 1989, 71-93. DOI: https://doi.org/10.1080/09534962.1989.11818986

Putatunda, S. K. Comparison of the Mechanical Properties of Austempered Ductile Cast Iron (ADI) Processed by Conventional and Step-Down Austempering Process. Materials and Manufacturing Processes. 25, 2010, 749 – 757. DOI: https://doi.org/10.1080/10426910903367394

Harding, R. A. The production, properties and automotive applications of austempered ductile iron. Kovove Mater, 45, 2007, 1-16.

Sellamuthu, P. et al. Austempered Ductile Iron (ADI): Influence of Austempering Temperature on Microstructure, Mechanical and Wear Properties and Energy Consumption. MDPI. Metals 2018, 8, 53. DOI: https://doi.org/10.3390/met8010053

Panneerselvam, S. et al. Influence of intercritical austempering on the microstructure and mechanical properties of austempered ductile cast iron (ADI). Materials Science & Engineering A. 694, 2017, 72 – 80. DOI: https://doi.org/10.1016/j.msea.2017.03.096

Eric, O. et al. Microstructure and toughness of CuNiMo austempered ductile iron. Materials Letters. 58, 2004, 2707 – 2711. DOI: https://doi.org/10.1016/j.matlet.2004.02.041

American Society for Testing and Materials – ASTM. Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings. ASTM A247 – 17. 2017.

American Society for Testing and Materials – ASTM. Standard Test Method for Determining Nodularity and Nodule Count in Ductile Iron Using Image Analysis. ASTM E2567 – 16a. 2016.

American Society for Testing and Materials – ASTM. Standard Test Method for Brinell Hardness of Metallic Materials. ASTM E10 – 18. 2018.

American Society for Testing and Materials – ASTM. Standard Test Methods for Notched Bar Impact Testing of Metallic Materials. ASTM E23-16b. 2016.

Kovacs, B. V. Austempered ductile iron: fact and function. Modern Casting. Vol. 80, n. 3, 1990, 38-41.

Murcia, S.C.; Ossa, E.A.; Celentano, D.J. Nodule Evolution of Ductile Cast Iron During Solidification. The Minerals, Metals & Materials Society. 45B, 2014, 707 – 718. DOI: https://doi.org/10.1007/s11663-013-9979-5

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Published

2020-06-29

How to Cite

Tissi, G. V., & da Fonseca, G. S. (2020). INFLUENCE OF AUSTEMPERING TIME AND AUSTEMPERING TEMPERATURE IN MICROSTRUCTURE AND MECHANICAL PROPERTIES IN AUSTEMPERED DUCTILE IRON. International Journal of Research -GRANTHAALAYAH, 8(6), 51–62. https://doi.org/10.29121/granthaalayah.v8.i6.2020.419