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Influence of nickel on the toughness of lean duplex stainless steel welds

机译：镍对贫双相不锈钢焊缝韧性的影响

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摘要

Three weldments with the nickel contents 1.3, 4.9 and 6.0 wt% were made from 30 mm LDX 2101~® plates. The weldments were subjected to tensile, impact and fracture toughness testing. The aim was to evaluate the susceptibility for brittle failure in the weld metal at sub-zero temperatures (℃). The amount of ferrite was higher for the 1.3 wt% nickel weldment compared to the other two which had similar phase composition and mean free ferrite distance. The result from the tensile testing showed that for the weldment with the highest nickel content the ductility remained unchanged with decreasing temperature while the other two weldments became less ductile with decreasing temperature. J-integral based fracture toughness testing showed a significant difference in the susceptibility for brittle failure with higher values for the weldment with 6 wt% nickel than for the others with lower nickel content.
机译：用30 mm LDX2101®板制作了三种镍含量分别为1.3、4.9和6.0 wt％的焊件。对焊件进行拉伸，冲击和断裂韧性测试。目的是评估零以下温度（℃）下焊缝金属脆性破坏的敏感性。与其他两种具有相似相组成和平均自由铁素体距离的焊件相比，1.3重量％镍焊件的铁素体含量更高。拉伸试验的结果表明，对于镍含量最高的焊件，延展性随温度降低而保持不变，而其他两个焊件的延展性随温度降低而变小。基于J积分的断裂韧性测试显示出脆性破坏敏感性的显着差异，镍含量为6 wt％的焊件的脆性值较高，镍含量较低的焊件的脆性脆性的敏感性更高。

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