Effect of Isothermal Aging on Magnetic Properties in 12Cr Steel


Article Preview

The magnetic coercivity of martensitic 12Cr steel was measured in order to evaluate its degree of isothermal aging. As the aging time increased, the lath width increased and the dislocations were recovered. Aging resulted in the coarsening of the as-tempered carbides (M23C6 and MX) followed by additional precipitation of Fe2W. The magnetic coercivity rapidly decreased during the initial aging period of about 1,000 hours and then decreased slightly thereafter. The decrease in the coercivity with increasing aging time was related to the decrease in the number of pinning sites, those associated with the dislocations, fine precipitates and coarsening of the martensite lath/subgrain.



Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim




C.S. Kim et al., "Effect of Isothermal Aging on Magnetic Properties in 12Cr Steel", Key Engineering Materials, Vols. 326-328, pp. 1201-1204, 2006

Online since:

December 2006




[1] P. J. Ennis, A. Zielinska-Lipiec, O. Wachter and A. Czyrska-Filemonowicz: Acta mater., 45 (1997) p.4901.

DOI: 10.1016/s1359-6454(97)00176-6

[2] F. Abe, T. Horiuch, M. Taneike and K. Sawada: Mater. Sci. Eng., A 378 (2004) p.299.

[3] J. I. Goldstein, D. E. Newbury, P. Echlin, D. C. Joy, A. D. Romig, C. E. Lyman, C. Fiori and E. Lifshin: Scanning Electron Microscopy and X-Ray Microanalysis, Plenum Press, (1992) p.91.

DOI: 10.1007/978-1-4613-0491-3_13

[4] F. Abe: Mater. Sci. Eng., A387-389 (2004) p.565.

[5] J. D. Verhoeven: Fundamentals of Physical Metallurgy, John Wiley & Sons, (1975) p.406.

[6] B. D. Cullity: Introduction to Magnetic Materials, Addison-Wesley, London, (1972) p.317.

[7] H. Kronmuller: Int. J. Nondestruct. Testing, 3 (1972) p.315.

[8] V. Moorthy, S. Vaidyanathan, T. Jayakumar and B. Raj: J. Mag. Mag. Mater., 171 (1997) p.179.

[9] S. Takahashi, J. Echigoya and E. Motoki: J. Appl. Phys., 87 (2000) p.805 The grain boundaries act as obstacles to the movement of the domain wall. The domain wall energy is influenced by the atomic structure of the grain boundaries.

[9] Therefore, in the case where the grain size is large, the grain boundary area and domain wall energy will be lower. However, there is no simple explanation for the effect of the subgrains on the coercivity. If we assume that the martensite lath/subgrain has a similar effect on the magnetic properties to that of the grain, then it is possible to understand the effect of the martensite lath/subgrain size on the magnetic coercivity.

Fetching data from Crossref.
This may take some time to load.