Influence of Silicon on the Spheroidization of Cementite in Hypereutectoid Bearing Steels

Author:

Kim Kwan Ho1,Lee Jae Seung1,Lee Duk Lak1

Affiliation:

1. POSCO

Abstract

The influence of silicon on the spheroidization of cementite in hypereutectoid 1.0C-1.45Cr bearing steels has been investigated, on the basis of microstructural analysis and thermodynamic calculations. The silicon content was varied 0.25 to 2.00 in weight percent. Annealed at 790∼850°C for 6 hr, the 0.25Si and 1.00Si steels were entirely spheroidized at 790°C, while 1.50Si and 2.00Si steels at 830°C, respectively. This implies that the increase of silicon content in hypereutectoid steels retards the spheoridization of cementite. The thermodynamic calculations revealed that silicon atoms were partitioned into not cementite but austenite at annealing temperatures, and the increase of silicon content can raise the chemical potential of carbon atoms within austenite at austenite/cementite interfaces, causing the decrease of driving force for the diffusion of carbon atoms from cementite to austenite.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference11 articles.

1. T. Harris and M. Kotzalas: Essential Concepts of Bearing Technology, fifth ed., Taylor & Francis, Boca Raton (2007).

2. G. Krauss: Principles of Heat Treatment of Steel, ASM (1980).

3. K.E. Thelning: Steel and Its Heat Treatment, Butterworth and Co., London (1984).

4. W. Knorr and H. Vöge: Steel. A Handbook for Materials Research and Engineering, vol. 1, Verein Deutscher Eisenhüttenleute, ed., Düsseldorf (1992).

5. S. Chattopadhyay and C.M. Sellars: Metallography Vol. 10 (1977), p.89.

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