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Non-Destructive Characterization of Nickel-Base Hardface Deposit on Austenitic Stainless Steel Through Eddy Current and Magnetic Barkhausen Techniques

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Abstract

Nickel-base Colmonoy (AWS ER NiCr) alloys find extensive application for hardfacing of austenitic stainless steel (SS) components in Fast Breeder Reactors. Gas Tungsten Arc deposited Colmonoy alloys suffer from significant loss in hardness and wear properties due to dilution from the austenitic SS substrate. In a multilayer deposit, dilution in first layer is highest and dilution decreases progressively in the subsequent layers. Although, both Colmonoy alloys and austenitic SS are non-magnetic, the deposit of Colmonoy on austenitic SS is ferromagnetic. The susceptibility to magnetic attraction in the hardface deposits is highest for maximum level of dilution and reduces with decreasing dilution. In the present study, Colmonoy-6 alloy co-deposited with austenitic SS filler wire, to obtain deposits with different levels of dilution, have been non-destructively evaluated by eddy current (EC) and magnetic Barkhausen (MB) techniques. The deposits were also characterized by microstructural and hardness studies. The EC parameters viz. magnitude and phase angle of the induced voltage showed an increasing trend with increasing dilution of the deposits. MB root mean square (RMS) voltage and peak height also indicated similar trend with dilution. The results produced from nondestructive tests could be correlated with hardness and microstructure of the deposits. Thus, it is possible to develop a non-destructive technique to predict hardness of the Colmonoy hardfacing alloy, which can serve as quality control tool in estimating the hardness of the hardfaced coating to ensure that dilution of the deposit by the substrate does not bring down the hardness of the deposit below the acceptable minimum values.

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Authors and Affiliations

  1. Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, India

    Gopa Chakraborty,  Adurthi Viswanath,  Chandan Kumar Mukhopadhyay,  Velayutham Ramasubbu,  Shaju Kattukaram Albert,  Bhagi Purna Chandra Rao,  Arun Kumar Bhaduri &  Tammana Jayakumar

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  1. Gopa Chakraborty
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  2. Adurthi Viswanath
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  3. Chandan Kumar Mukhopadhyay
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  4. Velayutham Ramasubbu
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  5. Shaju Kattukaram Albert
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  6. Bhagi Purna Chandra Rao
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  7. Arun Kumar Bhaduri
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  8. Tammana Jayakumar
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Correspondence to Gopa Chakraborty.

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Chakraborty, G., Viswanath, A., Mukhopadhyay, C.K. et al. Non-Destructive Characterization of Nickel-Base Hardface Deposit on Austenitic Stainless Steel Through Eddy Current and Magnetic Barkhausen Techniques. Weld World 56, 59–65 (2012). https://doi.org/10.1007/BF03321396

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