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The influence of different heat treatment cycles on controlled surface graphitization in CK45 steel

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Title: The influence of different heat treatment cycles on controlled surface graphitization in CK45 steel
Authors: Hamedi, Y.1, Kiani-Rashid, A.R.2 kianirashid@gmail.com, Shishegar, H.R.1, Azaat-Pour, H.R.2
Source: Journal of Alloys & Compounds. Mar2010, Vol. 492 Issue 1/2, p739-744. 6p.
Subjects: Heat treatment of steel, Microstructure, Graphitization, Steel metallurgy, Surfaces (Technology), Mechanical wear, Diffusion, Phase transitions
Abstract: Abstract: Controlled graphitization has become known as a practical method for improvement of wear resistance and machining properties in steels. In this paper, the effect of heat treatment on microstructure of CK45 steel has been investigated. Austenitising was carried out at 920°C for 5h. Besides, isothermal transformation was conducted at 750°C in the time range of 1–20h. In this work, full potential carbon resource was tried to be used around samples as a factor to prevent the burning of the limited carbon in steel and also to increase the percentage of sample surface carbon in order to improve wear capability and machining. The microstructure of the steel considerably changes by this heat treatment process which exhibits the effects of temperature, appropriate austenitising duration and isothermal transformation. Conducted experiments show a suitable distribution of semi-spherical graphite particles especially on the surface of the steel. Also, analyses demonstrate that the amount of formed graphite in the austenitising temperature 920°C is more than graphite in single heat treatment temperature of 750°C. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: Controlled graphitization has become known as a practical method for improvement of wear resistance and machining properties in steels. In this paper, the effect of heat treatment on microstructure of CK45 steel has been investigated. Austenitising was carried out at 920°C for 5h. Besides, isothermal transformation was conducted at 750°C in the time range of 1–20h. In this work, full potential carbon resource was tried to be used around samples as a factor to prevent the burning of the limited carbon in steel and also to increase the percentage of sample surface carbon in order to improve wear capability and machining. The microstructure of the steel considerably changes by this heat treatment process which exhibits the effects of temperature, appropriate austenitising duration and isothermal transformation. Conducted experiments show a suitable distribution of semi-spherical graphite particles especially on the surface of the steel. Also, analyses demonstrate that the amount of formed graphite in the austenitising temperature 920°C is more than graphite in single heat treatment temperature of 750°C. [Copyright &y& Elsevier]
ISSN:09258388
DOI:10.1016/j.jallcom.2009.12.036