Weldability of Fe-36%Ni Alloy (Report III) : Dynamic Observation of Reheat Hot Crack and Evaluation of Hot Ductility of Reheated Weld Metal(Materials, Metallurgy & Weldability)

概要

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This study has been planned to analyze the behavior of reheat hot cracking in the weld metal of Invar by means of the direct observation technique (MISO) coupled with the Cross-bead tensile hot cracking test. Moreover, hot ductility test was applied to study the characteristic of ductility trough causing the reheat hot crack. Main conclusions obtained are as follows: 1) The initiation of the reheat hot crack occurred at about 850℃ and the propagation did in the temperature range from about 600 to 1000℃. 2) Increase in crosshead speed causes high ductility and different fracture mode from that in the weld cracking test. 3) There is a good correlation between the total crack length in the weld cracking test and the characteristic of ductility curve in the hot ductility test. 4) Brittleness temperature range and minimum ductility which secure crack free welding in fabrication of membrane-type LNG tanks were evaluated.
大阪大学の論文