再加熱された再現溶接熱影響部の高温延性におよぼす引張速度の影響

概要

論文の詳細を見る
Hot ductility and tensile strength are investigated on the synthetic heat-affected-zones (HAZ) simulating weld thermal and reheating cycles in relation to tensile strain rate dependency. Four commercial steels, three, high strength and one mild steel, are used for testing. Four programs of weld thermal cycles A, B, C, and D are compared, but the main experiments are conducted on thermal cycle C, which is a tensile test at various strain rates on each holding temperature with subsequent reheating of the first weld thermal cycle of 1400℃ peak temperature. The main results are as follows : (1) Hot ductilities of synthetic HAZ specimens tested at various temperatures generally fall after subsequnt reheating thermal cycle. (2) Hot ductilities of synthetic HAZ specimens generally decrease at slower strain rates. Especially, in case of 80kg/(mm)^2 high strength steel 8A, the hot ductility of synthetic HAZ specimen falls to almost zero after subsequent reheating at about 700℃ and/or 900℃. (3) In various hot ductility curves, three distinct temperatures are found, that is, one of maximum ductility T_H and two of minimum T_<L1> and T_<L2>. (4) The maximum ductility temperature T_H exists in 700∿800℃ range, and their hot ductilities are not affected by strain rates. However, in the other temperature ranges, hot ductilily decreases rapidly with an increasing strain rate. (5) Hot tensile strength in reheating weld thermal cycle increases straightly with an increase of strain rate on a logarithmic scale. (6) Fractographic observations of reheating weld HAZ specimens showed that an intergranular fracture mostly occurred in case of testing in T_H temperature range, and was more significant with an increasing strain rate.
社団法人溶接学会の論文
1972-10-25

再加熱された再現溶接熱影響部の高温延性におよぼす引張速度の影響

スポンサーリンク

概要

著者

関連論文

スポンサーリンク