熱影響部の脆化について(第 4 報) : 低温脆性について

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It is recognized that the impact-resistance of sharp-notched specimen decreases suddenly at the so-called "transition temperature". Below this temperature the fracture shows more brittle than shear one and at low temperatures the shear fracture vanishes. It is important to investigate the properties of welded part at low temperatures. The authors reported in the previous report that there are two brittle zones in the heat-affected zone both in killed and rimmed steels, after testing the distribution of impact resistance when a single bead was deposited on the surface of steel and observing the fracture with X-ray diffraction method and microscope. In this report the authors mainly deal with the low temperature brittleness of heat-affected zone of parent plate. Observation of the X-ray diffraction rings of the fractures as well as V-notch Charpy impact resistances are also given. As a result of experiments it has been concluded as follows : 1) Weld metal shows somewhat different pattern of the temperature-resistance curve as compared with that of heat-affected zone. In the temperature range above 60℃, the resistance is somewhat inferior, which is ascribed to the precipitation of nitride, but at lower temperatures it is superior to that of heat-affected zone, which may be the effect of low carbon content and small grain size. 2) The most brittle part in the heat-affected zone is the one which is affected by the temperature-increase reaching around A transformation point through heat of arc. 3) In the temperature range below 30℃, the influence of welding heat vanishes; so there exists no differences in the impact resistance of parent plate, but the resistance of weld metal is good in this range.
社団法人溶接学会の論文
1954-04-01

熱影響部の脆化について(第 4 報) : 低温脆性について

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