Impact Property at Cryogenic Temperature of Candidate Materials for Fusion Reactor and Their Electron Beam Welded Joints(Materials, Metallurgy & Weldability)

概要

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Impact properties at cryogenic temperature of candidate materials for fusion reactor and their electron beam welded joints are ivestigated by using instrumented Charpy impact testing apparatus. Materials used are aluminum alloys (A7NO1, A5083, A6061), JFMS (Japanese Ferritic Martensitic Steel) and two kinds of high manganese steel. Although JFMS is a steel for high temperature use, the impact test is conducted at same cryogenic temperature as the cases of the other materials. Testing results are obtained as follows. 1. Base metal and welded joint of aluminum alloys exhibit high absorbed energy at low temperature. 2. Base metal and welded joint of JFMS show an absorbed energy transition temperature at near a room temperature. 3. Base metal and welded joint of high manganese steel, A-T (18Mn), exhibit an abrupt decreasing of absorbed energy at 77K, but base metal and welded joint of high manganese steel, B-T (22Mn-0.2N), exhibit gradual increasing of maximum strength and decreasing of ductility with decreasing of test temperature.
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