高張力鋼熔接変質部の冷却状況と顕微鏡組織および硬度(第1報) : 鋼材寸法の影響

概要

論文の詳細を見る
The shape of base plate used for welding test was changed in thickness, width and length independently. A single bead was deposited on the center-line of each plate over wholelength with the covered electrode under uniform conditions. The thickness influences most severly on the cooling curve of heat-affected zone near the fusion line. The width has also certain effect on the curve, but the length scarcely concerns. The cooling curves are similar, when the plate-size is llmm in thickness and is larger than 150mm in width. The maximum hardness in the heat-affected zone also inclines to become constant over this size. In this investigation, the microstructure in the heat-affected zone was classified into three kinds; the structure which contains primary ferrite, the intermediate transformation structure (Zwischenstufengefiige) and the structure which contains martensite among the intermediate transformation structure. The maximum hardness in the heat-affected zone depends on the cooling time from A3 point to any constant temperature between 400 and550°C as shown in Fig. 8, 9 and 10.
社団法人溶接学会の論文
1957-12-25