Assessment of Microstructural Degradation in 2.25Cr-1Mo Steel Using Miniature Specimen Technique

B.B. Jha; T.K. Sahoo; D. Tripathy; Barada Kanta Mishra

doi:10.4028/www.scientific.net/DDF.319-320.25

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 319-320Assessment of Microstructural Degradation in...

Assessment of Microstructural Degradation in 2.25Cr-1Mo Steel Using Miniature Specimen Technique

Abstract:

Miniature specimen techniques viz. small-punch tests (SPT) have been carried out at room temperature in order to correlate the microstructural degradation of 2.25Cr-1Mo steel with that of SPT parameters. Microstructural degradation of this steel has been introduced as a result of thermal ageing corresponding to Larson-Miller parameters (LMP) values of 33,012, 35,402, 37,846 and 38,374. SPT parameters viz. total area and area under the region of plastic instability of the load-displacement curve have been found to decrease with an increase in LMP values. A strength parameter viz. UTS obtained using uniaxial tensile tests has also been found to decrease with an increase in LMP values. The results indicated that miniature specimen techniques viz. small-punch test could be successfully used to assess the degradation of microstructures in 2.25Cr-1Mo steel generated due to their exposure to high temperatures.

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Periodical:

Defect and Diffusion Forum (Volumes 319-320)

Pages:

25-35

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.319-320.25

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Online since:

October 2011

Authors:

B.B. Jha, T.K. Sahoo, D. Tripathy, Barada Kanta Mishra

Keywords:

2.25Cr-1Mo Steel, Larson-Miller Parameter (LMP), Microstructural Degradation, Plastic Instability, Small Punch Test

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