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Hot cracking susceptibility in laser weld metal of high nitrogen stainless steels

机译：高氮不锈钢激光焊接金属的热裂纹敏感性

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摘要

High nitrogen stainless steels are used as structural materials required to possess high strength and fracture toughness at low temperatures. The solidification mode in weld metals of stainless steels is generally designed to be the primary ferrite solidification mode to prevent hot cracking. The weld metals in some high nitrogen stainless steels, however, exhibit the primary austenite solidification mode because of an austenitizing effect of nitrogen, which enhances hot cracking susceptibility. In addition, laser welding provides the primary austenite solidification mode in weld metals of stainless steels due to the high solidification rate. Therefore, the laser weld metal of high nitrogen stainless steels likely occurs hot cracking. This study was conducted to make clear an effect of nitrogen and the solidification rate on hot cracking susceptibility in the laser weld metals of type 304 stainless steels varied with nitrogen content. The hot cracking susceptibility was examined by the preloading tensile strain (PLTS) cracking test. The PLTS test results showed that hot cracking susceptibility was remarkably increased with increase in the solidification rate and the nitrogen content. On the other hand, the solidification mode in the weld metal was changed from the primary ferrite to the primary austenite, as the solidification rate was raised. The primary austenite solidification mode was also observed in the weld metals with higher nitrogen content at lower solidification rate conditions. The experimental results indicated that the increase in hot cracking susceptibility is in agreement with the transition of solidification mode from the primary ferrite to the primary austenite in the weld metal. The transition of solidification mode in the weld metals of high nitrogen stainless steels could be predicted by the calculation using the modified Kurz-Giovanola-Trivedi model considering the effect of nitrogen.
机译：高氮不锈钢用作在低温下具有高强度和断裂韧性所需的结构材料。通常将不锈钢焊接金属中的凝固模式设计为​​主要的铁素体凝固模式，以防止热裂纹。但是，由于氮的奥氏体化作用，某些高氮不锈钢中的焊缝金属表现出主要的奥氏体凝固模式，从而提高了热裂纹敏感性。另外，由于高的凝固速率，激光焊接在不锈钢的焊接金属中提供了主要的奥氏体凝固模式。因此，高氮不锈钢的激光焊接金属可能会发生热裂纹。进行这项研究的目的是弄清楚氮和凝固速率对随氮含量变化的304型不锈钢激光焊接金属中热裂纹敏感性的影响。通过预加载拉伸应变（PLTS）裂纹测试检查了热裂纹敏感性。 PLTS测试结果表明，随着凝固速率和氮含量的增加，热裂化敏感性显着提高。另一方面，随着凝固速度的提高，焊缝金属的凝固模式从一次铁素体变为一次奥氏体。在较低的凝固速率条件下，在氮含量较高的焊接金属中也观察到了主要的奥氏体凝固模式。实验结果表明，热裂纹敏感性的增加与焊接金属中凝固模式从初生铁素体向初生奥氏体的转变相一致。高氮不锈钢焊缝金属中凝固模式的转变可以通过考虑氮影响的修正Kurz-Giovanola-Trivedi模型的计算来预测。

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