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

Notes on Pteromalidae (Hymenoptera, Chalcidoidea)

Volume: 13Start Page: 1End Page: 2

Six new species of chalcid flies parasitic upon |Ericoccus greeni| Newstead

Volume: 12Start Page: 329End Page: 33

Notes on European species of the genus Aphelinus Dalm., parasitic upon the plant-lice

Volume: 13Start Page: 266End Page: 27

Hym\ue9nopt\ue8res parasites nouveaux ou peu connus

Volume: 12Start Page: 223End Page: 24