Journal article
Effect of Grain Boundary Character Distribution on the Impact Toughness of 410NiMo Weld Metal
Grain boundary character distributions in 410NiMo weld metal were studied in the as-welded, first-stage, and second-stage postweld heat treatment (PWHT) conditions, and these were correlated with the Charpy-V impact toughness values of the material. The high impact toughness values in the weld metal in the as-welded and first-stage PWHT conditions compared to that in the second-stage condition are attributed to the higher fraction of low-energy I pound boundaries.
A higher volume fraction of retained austenite and coarser martensite after second-stage PWHT accompanied by the formation of the ideal cube component in the 2-hour heat-treated specimen led to a reduction in the toughness value. A subsequent increase in the PWHT duration at 873 K (600 A degrees C) enhanced the formation of {111}aOE (c) 112 >, which impedes the adverse effect of the cubic component, resulting in an increase in the impact toughness.
In addition to this, grain refinement during 4-hour PWHT in the second stage also increased the toughness of the weld metal.
Language: | English |
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Publisher: | Springer US |
Year: | 2016 |
Pages: | 3397-3411 |
ISSN: | 15431940 and 10735623 |
Types: | Journal article |
DOI: | 10.1007/s11661-016-3481-z |