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研究了具有不同加工方法、成分和显微组织的工业用低台金高强度钢板,在1.5～9千焦·毫米~(-1)线能量下的焊接性能。利用夏比V型缺口试验来表征焊接状态下和焊后热处理状态下的焊接热影响区的韧性。通常,增加线能量,就会产生诸如先共析铁素体,魏氏铁素体和上贝氏体的高温转变产物,从而降低了低温冲击韧性。然而,在所有焊接状态下,含镍和钼的控轧低碳低台金高强度钢却具有良好的冲击性能,这是由于热影响区主要含有针状铁素体。低碳控轧钢比淬火一回火钢具有更好的冲击性能。焊后的应力消除,一般对低温韧性没有明显的影响。在热影响区的硬度值表明,这种钢对氢致冷开裂未必是敏感的。
The welding performance of industrial high strength low alloy steel plate with different processing methods, compositions and microstructures was studied under the energy of 1.5 ~ 9 kJ · mm -1. The Charpy V-notch test was used to characterize the toughness of the weld HAZ under both welded and post-weld heat treatments. In general, increasing the line energy produces high temperature transformation products such as pro-eutectoid ferrite, Weisner’s ferrite and upper bainite, thereby reducing low-temperature impact toughness. However, nickel-and-molybdenum-controlled, low-carbon, low-gauge high-strength steels have good impact properties at all welding conditions because of the predominantly acicular ferrite in the HAZ. Low-carbon controlled-rolled steel has a better impact performance than hardened steel. After welding stress relief, generally no significant impact on the low temperature toughness. Hardness values in the HAZ indicate that this steel is not necessarily sensitive to hydrogen cracking.