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

0463929 - ÚFM 2017 RIV US eng J - Journal Article
Falat, L. - Kepič, J. - Čiripová, L. - Ševc, P. - Dlouhý, Ivo
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. Roč. 31, č. 10 (2016), s. 1532-1543. ISSN 0884-2914. E-ISSN 2044-5326
Institutional support: RVO:68081723
Keywords : steel * welding * strength
Subject RIV: JG - Metallurgy
Impact factor: 1.673, year: 2016

Cross-weld hardness profile, notch-tensile strength, and impact toughness of T92 steel heataffected 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.
Permanent Link: http://hdl.handle.net/11104/0263031