Effect of Grain Boundary Character Distribution on the Impact Toughness of 410NiMo Weld Metal

M. Divya, Chitta Ranjan Das, Sandip Ghosh Chowdhury, S. K. Albert, A. K. Bhaduri

Research output: Contribution to journalJournal articleResearchpeer-review

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 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.
Original languageEnglish
JournalMetallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Volume47A
Issue number7
Pages (from-to)3397-3411
ISSN1073-5623
DOIs
Publication statusPublished - 2016

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