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Effect of Structural Heterogeneity on In Situ Deformation of Dissimilar Weld Between Ferritic and Austenitic Steel

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Abstract

Low-alloy steel and 304LN austenitic stainless steel were welded using two types of buttering material, namely 309L stainless steel and IN 182. Weld metals were 308L stainless steel and IN 182, respectively, for two different joints. Cross-sectional microstructure of welded assemblies was investigated. Microhardness profile was determined perpendicular to fusion boundary. In situ tensile test was performed in scanning electron microscope keeping low-alloy steel-buttering material interface at the center of gage length. Adjacent to fusion boundary, low-alloy steel exhibited carbon-depleted region and coarsening of matrix grains. Between coarse grain and base material structure, low-alloy steel contained fine grain ferrite-pearlite aggregate. Adjacent to fusion boundary, buttering material consisted of Type-I and Type-II boundaries. Within buttering material close to fusion boundary, thin cluster of martensite was formed. Fusion boundary between buttering material-weld metal and weld metal-304LN stainless steel revealed unmixed zone. All joints failed within buttering material during in situ tensile testing. The fracture location was different for various joints with respect to fusion boundary, depending on variation in local microstructure. Highest bond strength with adequate ductility was obtained for the joint produced with 309L stainless steel-buttering material. High strength of this weld might be attributed to better extent of solid solution strengthening by alloying elements, diffused from low-alloy steel to buttering material.

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Acknowledgment

The authors are indebted to Director_CSIR-NML for providing infrastructural facilities to carry out the investigation and providing permission to publish the work.

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Authors and Affiliations

  1. Materials Science & Technology Division, CSIR_National Metallurgical Laboratory, Jamshedpur, 831007, India

    S. K. Das (Principal Scientist), G. Das (Principal Scientist) & B. Mahato (Tech. Officer)

  2. Department of Mechanical & Manufacturing Engineering, Manipal Institute of Technology, Manipal, 576104, India

    R. Santosh (Research Fellow) & J. Korody (Professor)

  3. Reactor Safety Division, Bhaba Atomic Research Centre, Mumbai, 400085, India

    S. Kumar (Scientific Officer) & P. K. Singh (Scientific Officer ‘G’)

  4. Structural Characterization Group, MST Division, CSIR_National Metallurgical Laboratory, Jamshedpur, 831007, India

    M. Ghosh (Ph.D, Post Doctoral, Senior Scientist)

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  1. M. Ghosh
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  2. R. Santosh
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  3. S. K. Das
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  4. G. Das
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Correspondence to M. Ghosh.

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Manuscript submitted December 9, 2014.

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Ghosh, M., Santosh, R., Das, S.K. et al. Effect of Structural Heterogeneity on In Situ Deformation of Dissimilar Weld Between Ferritic and Austenitic Steel. Metall Mater Trans A 46, 3555–3568 (2015). https://doi.org/10.1007/s11661-015-2930-4

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  • DOI: https://doi.org/10.1007/s11661-015-2930-4

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