Magnetic evaluation of creep in modified 9Cr–1Mo steel

Mitra, A.; Mohapatra, J. N.; Swaminathan, J.; Ghosh, Mainak; Panda, Ashis K.; Ghosh, R.

doi:10.1016/j.scriptamat.2007.07.004

Cited by 65 publications

(35 citation statements)

References 11 publications

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“…Various non-destructive methods have been used to evaluate material degradation due to creep [1][2][3][4][5][6][7]. Among them one can indicate a magnetoacoustic emission technique [2,3] or Barkhausen noise method [4,5] for example.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of the Mechanical Properties of P91 Steel by Means of Magneto-acoustic Emission and Acoustic Birefringence

2017

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The paper describes an application of nondestructive volumetric magnetic and ultrasonic techniques for evaluation of the selected mechanical parameter variations of P91 steel having direct influence on its suitability for further use in critical components used in power plants. Two different types of deformation processes were carried out. First, a series of the P91 steel specimens was subjected to creep and second, one to plastic deformation in order to achieve the material with an increasing strain level up to 10%. Subsequently, non-destructive and destructive tests were performed. Magnetic methods based on measurements of magnetoacoustic emission and magnetic hysteresis loop changes as well as the ultrasonic method based on acoustic birefringence measurements, were applied. Finally, the static tensile tests were carried out in order to evaluate the mechanical parameters. It is shown that some relationships between the selected parameters coming from the non-destructive and destructive tests may be formulated.

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Section: Introductionmentioning

confidence: 99%

“…Among them one can indicate a magnetoacoustic emission technique [2,3] or Barkhausen noise method [4,5] for example. A review of various non-destructive techniques that allow the evaluation of creep damage progress was presented by Sposito et al [6].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Mechanical Properties of P91 Steel by Means of Magneto-acoustic Emission and Acoustic Birefringence

2017

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“…2, the PIRP decreases along with an increase in aging time. This phenomenon can be explained by a magnetic softening, resulting from the migration of carbides towards the grain [9]. Fig.…”

Section: Resultsmentioning

confidence: 97%

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

Bong¹,

Ryu²,

Nahm³

et al. 2011

Journal of Magnetics

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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.

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“…Therefore, attempts are being made by researchers to develop the Non-Destructive Evaluation (NDE) of such microstructural changes for the safety of components. Since magnetic properties of ferromagnetic alloys are very sensitive to microstructural modifications and the stress state, the popularity of magnetic techniques is growing for the NDE of deformations by creep, fatigue, thermal ageing, and irradiation [10][11][12][13][14]. In our earlier paper we found a good correlation between changes in magnetic properties, particularly with Cr contents of 15% and 20% with thermal ageing at 475 o C [15].…”

Section: Introductionmentioning

confidence: 84%

Evaluation of Embrittlement in Isochronal Aged Fe-Cr Alloys by Magnetic Hysteresis Loop Technique

Mohapatra¹,

Kamada²,

Kikuchi³

et al. 2011

Journal of Magnetics

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Fe-Cr alloys with different Cr contents were prepared by an arc melting technique. The alloys were isochronally aged in the range from 400 o C to 900 o C with 50 o C steps with a holding time of 100 hours. The ageing produced embrittlement in the alloys due to either the formation of a Cr-rich α' phase or a σ phase at high temperatures. Magnetic Hysteresis Loop (MHL) and Micro-Vickers hardness were measured at each step to correlate the magnetic and mechanical properties. Coercivity and hardness of the alloys were increased and remanence decreased up to 500-550 o C due to formation of a Cr-rich α' phase. Beyond 500-550 o C range, the coercivity and hardness decreased and remanence increased due to the coarsening or dissolution of the Cr-rich α' phase. In the Fe-48% Cr alloy, formation of the σ phase at 700 o C reduced the maximum induction of the alloy significantly.

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Magnetic evaluation of creep in modified 9Cr–1Mo steel

Cited by 65 publications

References 11 publications

Prediction of the Mechanical Properties of P91 Steel by Means of Magneto-acoustic Emission and Acoustic Birefringence

Prediction of the Mechanical Properties of P91 Steel by Means of Magneto-acoustic Emission and Acoustic Birefringence

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

Evaluation of Embrittlement in Isochronal Aged Fe-Cr Alloys by Magnetic Hysteresis Loop Technique

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