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| Effect of Isothermal Aging on the Magnetic Properties of 1Cr-0.5Mo Steel |
| Journal of Magnetics, Volume 16, Number 3, 30 Sep 2011, Pages 225-228 |
Min-gi Kim (Div. of Industrial Metrology, Korea Research Institute of Standards and Science), K. S. Ryu *  (Div. of Industrial Metrology, Korea Research Institute of Standards and Science), Y. H. Lee (Div. of Industrial Metrology, Korea Research Institute of Standards and Science), J. S. Park (Div. of Industrial Metrology, Korea Research Institute of Standards and Science), C. G. Kim (Dept. of Materials Engineering, Chungnam National University) |
| Abstract |
Magnetic properties and Rockwell hardness of 1Cr-0.5Mo steel have been investigated as a function of isothermal aging time. Our results showed that coercivity, hysteresis loss and Rockwell hardness in the aged samples decreased as aging time increased. This phenomenon was analyzed using optical microscopy and scanning electron microscopy. A significant diffusion of Cr and Mo atoms formed M2C and M7C carbides, lowering the matrix strength. M2C and M7C carbides partially segregated inside grains, diffused into grain boundaries, and finally resulted in a soft ferrite matrix and a hard grain boundary. The magnetic and mechanical softening of the matrix is likely to govern the properties of the sample more than the hardening of the grain boundary by carbide precipitations.
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| Keywords: 1Cr-0.5Mo steel; coercivity; hysteresis loss; Rockwell hardness; carbide; isothermal aging |
| DOI: http://dx.doi.org/10.4283/JMAG.2011.16.3.225 |
| Full Text: PDF |
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