Mechanical characterization and optimization of heat treatment parameters of manganese alloyed austempered ductile iron

  • Ananda Hegde Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • Sathyashankara Sharma Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • Ramakrishna Vikas Sadanand Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
Keywords: Optimization, Analysis of variance, Austempered ductile iron, Austenitization, Austempering

Abstract

Austempered Ductile Iron (ADI) belongs to the family of cast irons whose mechanical properties are altered using austempering heat treatment process. The objective of this paper is to study the effects of heat treatment parameters on manganese alloyed ADI. Hence, austenitization temperature, austempering temperature and austempering time are taken as the control variables along with the manganese content in the material. The effects of heat treatment are studied by measuring the ultimate tensile strength and the hardness of the material.  The regression equations are developed to relate the various parameters under study. The microstructures of the specimen reveal that retained austenite content increases with increase in manganese and results in decrease in hardness of the material. The statistical analyses indicate that the austempering temperature is the major factor affecting the variation in hardness and tensile strength with 74.5 % of contribution within the range of values whereas,  variation in manganese content does not have significant effect on hardness within the investigated composition range in the material.

Published
2019-03-28
How to Cite
Hegde, A., Sharma, S., & Vikas Sadanand, R. (2019). Mechanical characterization and optimization of heat treatment parameters of manganese alloyed austempered ductile iron. Journal of Mechanical Engineering and Sciences, 13(1), 4356-4367. https://doi.org/10.15282/jmes.13.1.2019.01.0371