Effects of two stage austempering heat treatment on microstructure and wear rates of ADI balls used in ball mill for grinding of iron ore

B. R.N. Murthy

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1 Citation (Scopus)

Abstract

Wear conduct of Austempered Ductile Iron (ADI) balls in the grinding of iron ore in a ball mill process was examined as a function of microstructure developed by carrying out 2-stage asutempering heat treatment. Various microstructure of ADI are produced by austenitising SG (spheroidal ghaphite) iron balls at 9200 C for 60 minutes of time and given step austempering heat treatments those includes first step austenitising at 3000 C for different time intervals like 15, 30, 45, and 60 minutes followed by second step austeniting at 4000 C for 60 minutes of time for each case. The grinding wear conduct of these materials are evaluated for the wear loss under the wet milling conditions. The grinding processes were carried out for 60 minutes of time at the speed of 86 rpm and a pulp density of 60 % under sealed mill conditions .The slurry pH value is varied from 7 to 10.5 to evaluate the impact of pH on grinding wear performance of ball material. From this experimental work it is discovered that wear rate of grinding media material decrements relatively in increments with the pH value of the slurry. ADI which is austempered for 30 min in the first stage followed by 60 minutes in the second stage shows the lowest wear rate.

Original languageEnglish
Pages (from-to)701-708
Number of pages8
JournalInternational Journal of Mechanical Engineering and Technology
Volume9
Issue number13
Publication statusPublished - 01-12-2018
Externally publishedYes

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Grinding (comminution)
Nodular iron
Ball mills
Iron ores
Heat treatment
Wear of materials
Microstructure
Milling (machining)
Pulp

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "Wear conduct of Austempered Ductile Iron (ADI) balls in the grinding of iron ore in a ball mill process was examined as a function of microstructure developed by carrying out 2-stage asutempering heat treatment. Various microstructure of ADI are produced by austenitising SG (spheroidal ghaphite) iron balls at 9200 C for 60 minutes of time and given step austempering heat treatments those includes first step austenitising at 3000 C for different time intervals like 15, 30, 45, and 60 minutes followed by second step austeniting at 4000 C for 60 minutes of time for each case. The grinding wear conduct of these materials are evaluated for the wear loss under the wet milling conditions. The grinding processes were carried out for 60 minutes of time at the speed of 86 rpm and a pulp density of 60 {\%} under sealed mill conditions .The slurry pH value is varied from 7 to 10.5 to evaluate the impact of pH on grinding wear performance of ball material. From this experimental work it is discovered that wear rate of grinding media material decrements relatively in increments with the pH value of the slurry. ADI which is austempered for 30 min in the first stage followed by 60 minutes in the second stage shows the lowest wear rate.",
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