Degradation Evaluation of Mechanical Property for Modified 9Cr-1Mo Steel by Reversible Permeability

作者：Bong Chung jong; Ryu Kwon sang^*; Nahm Seung hoon; Kim Eun Kyu

来源：Journal of Magnetics, 2011, 16(1): 42-45.

DOI：10.4283/JMAG.2011.16.1.042

• degradation
• modified 9Cr-1Mo steel
• nondestructive evaluation
• peak interval of reversible permeability (PIRP)

The present work studies a nondestructive evaluation of the degradation of modified 9Cr-1Mo steel using a magnetic method based on the existence of the peaks of reversible permeability (RP) in the differential magnetization around the coercive force. The apparatus is based on detection of the voltage induced in a coil using a lock-in amplifier tuned to the frequency of the AC perturbing field. Results obtained for the reversible permeability and Vickers hardness on the aged samples showed the peak interval of reversible permeability (PIRP) and Vickers hardness decrease as aging time increased. The correlation between Vickes hardness and the PIRP could be used to evaluate degradation of modified 9Cr-1Mo steel.

• 出版日期2011-3