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The effects of postweld heat treatment and isothermal aging on T92 steel heat-affected zone mechanical properties of T92/TP316H dissimilar weldments

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Abstract

Cross-weld hardness profile, notch-tensile strength, and impact toughness of T92 steel heat-affected zone (T92 HAZ) of dissimilar T92/TP316H welds were studied in dependence of their postweld heat treatment (PWHT) and subsequent long-term aging. Two weldments series were individually subjected to either “single-step” tempering PWHT or a modified “two-step” renormalizing and tempering PWHT. Subsequently, the welds were isothermally aged at 625 °C for durations from 500 up to 11,000 h. The “single-step” PWHT preserved sharp hardness gradient of T92 HAZ, whereas the “two-step” PWHT led to the hardness values equalization. The T92 HAZ of the weldment after the “two-step” PWHT exhibited initially lower strength and higher toughness, compared to the weldment after the “single-step” PWHT. However, after long-term aging a more suitable combination of T92 HAZ mechanical properties i.e., the higher toughness and acceptable strength exhibited the weldments processed by “single-step” PWHT.

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ACKNOWLEDGMENTS

This work has been financially supported by “Vedecká Grantová Agentúra MŠVVaŠ SR a SAV (VEGA)” under the grants numbers 2/0116/13 and 2/0151/16. The experimental welded joints were produced by the company SES, a.s., Tlmače, Slovakia. The authors are grateful to Dr. Martin Sopko (IMR SAS, Košice, Slovakia) for performed DSC measurement.

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Authors and Affiliations

  1. Institute of Materials Research, Slovak Academy of Sciences, SK 040 01, Košice, Slovak Republic

    Ladislav Falat, Ján Kepič, Lucia Čiripová & Peter Ševc

  2. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, CZ 616 62, Brno, Czech Republic

    Ivo Dlouhý

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  1. Ladislav Falat
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  2. Ján Kepič
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  3. Lucia Čiripová
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  5. Ivo Dlouhý
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Correspondence to Ladislav Falat.

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Falat, L., Kepič, J., Čiripová, L. et al. The effects of postweld heat treatment and isothermal aging on T92 steel heat-affected zone mechanical properties of T92/TP316H dissimilar weldments. Journal of Materials Research 31, 1532–1543 (2016). https://doi.org/10.1557/jmr.2016.134

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