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- Title
Effect of Grain Boundary Character Distribution on the Impact Toughness of 410NiMo Weld Metal.
- Authors
Divya, M.; Das, C.; Chowdhury, Sandip; Albert, S.; Bhaduri, A.
- Abstract
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 Σ 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 °C) enhanced the formation of {111}〈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.
- Subjects
KIRKENDALL effect; WELDABILITY of metals; RESIDUAL stresses; HEAT treatment of metals; MARTENSITE; LOW-energy nuclear reactions
- Publication
Metallurgical & Materials Transactions. Part A, 2016, Vol 47, Issue 7, p3397
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-016-3481-z