Welded joints suffer from hydrogen embrittlement (HE) owing to the internal stress generated during welding. Alloying elements play a vital role in the metallurgical behavior of welded joints. In this study, the influence of chromium (Cr) and titanium (Ti) on the HE behavior of welded joints in low-alloy steel was investigated by examining the microstructural morphology, grain characteristics, precipitate particles, engineering stress–strain curves, and fracture modes. The experimental results indicated that, compared with the addition of Cr, the addition of Ti promoted the formation of acicular ferrite in the lower fusion zone (FZ) via Ti-bearing oxides, and refined the grains of the FZ. The strength and elongation of the Ti joint were superior to those of the Cr joint in both air- and hydrogen-containing environments. Furthermore, compared with the addition of Cr, the addition of Ti improved the HE sensitivity. The fracture modes of both the Cr and Ti welded joints changed from ductile to brittle when the prepared joints were exposed to an H-containing environment.

中文翻译：

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Ti、Cr对铠装层用低合金钢焊接接头显微组织和氢脆的影响

由于焊接过程中产生的内应力，焊接接头会出现氢脆（HE）。合金元素在焊接接头的冶金性能中起着至关重要的作用。在这项研究中，通过检查显微组织形态、晶粒特征、析出物颗粒、工程应力-应变曲线和断裂情况，研究了铬（Cr）和钛（Ti）对低合金钢焊接接头HE行为的影响。模式。实验结果表明，与Cr的添加相比，Ti的添加通过含Ti氧化物促进下熔合区(FZ)中针状铁素体的形成，并细化了FZ的晶粒。在含空气和含氢环境中，Ti 接头的强度和伸长率均优于 Cr 接头。此外，与Cr的添加相比，Ti的添加提高了HE灵敏度。当制备的接头暴露在含氢环境中时，Cr 和 Ti 焊接接头的断裂模式都从韧性变为脆性。