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Weldability of High Nitrogen Stainless Steel

机译：高氮不锈钢的焊接性

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摘要

The purpose of this paper is to give a short survey of nitrogen influence on stainless steel welds. The review are covers: the levels of nitrogen in weld metal, the influence of nitrogen on stainless steel weld metal characteristics such as weld defects, corrosion resistance and mechanical properties. High nitrogen steel welding must consider the risk of nitrogen escape from the weld pool. Avoiding nitrogen losses may be accomplished by controlling shielding gas, welding parameters and compositions of filler metal. The increase of nitrogen in the weld metal decreases in the δ ferrite content. The reduction of δ ferrite in austenitic weld metals will result in an increase in the solidification cracking susceptibility. However, the role of nitrogen in affecting the solidification cracking susceptibility of fully austenitic weld metals is unclear. Nitrogen addition increases the pitting corrosion resistance in weld metals whereas decreases resistance to stress corrosion cracking because of δ ferrite reduction. Nitrogen also improves mechanical properties in weld metals. However, the presence of nitrides may be detrimental to the mechanical properties in stainless steel welds.
机译：本文的目的是简要调查氮对不锈钢焊缝的影响。综述内容包括：焊接金属中的氮含量，氮对不锈钢焊接金属特性（如焊接缺陷，耐腐蚀性和机械性能）的影响。高氮钢焊接必须考虑氮从焊池中逸出的风险。通过控制保护气体，焊接参数和填充金属的成分可以避免氮损失。焊接金属中氮的增加会降低δ铁素体含量。奥氏体焊接金属中δ铁素体的减少将导致凝固裂纹敏感性的增加。但是，氮在影响完全奥氏体焊接金属的凝固裂纹敏感性方面的作用尚不清楚。氮的添加增加了焊接金属的抗点蚀性，而由于δ铁素体的减少，降低了对应力腐蚀开裂的抗性。氮还可以改善焊接金属的机械性能。但是，氮化物的存在可能对不锈钢焊缝的机械性能有害。

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