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本研究工作采用卧式对接插销试验和定载荷氢脆试验对低合金高强钢焊接冷裂纹敏感性进行了探讨,从试验的结果可以认为: 钢中的夹杂物可以作为氢的陷井,吸取更多的氢,因而降低了氢在晶界和局部的集积。所以,在本试验范围内,钢中的夹杂物越多,冷裂纹敏感性将得到改善。含硼的钢,由于增加钢的淬硬性,因此提高了冷裂纹的敏感性。此外硼还能促使氢在晶界集积,造成晶界脆弱。由上所述,使晶內存在适量的夹杂物和尽可能降低钢中的含硼量,可以作为改善冷裂敏感性的重要手段。
In this study, horizontal butt-plug test and hydrogen-embrittlement test were used to investigate the sensitivity of cold-formed low-alloy high-strength steel to cold welding. From the results of the experiment, it can be concluded that inclusions in steel can be used as hydrogen traps to absorb more More hydrogen, thus reducing the hydrogen in the grain boundary and local accumulation. Therefore, within the scope of this test, the more inclusions in the steel, the cold crack sensitivity will be improved. Boron-containing steels increase the susceptibility to cold cracking due to increased hardenability of the steel. In addition, boron can also promote the accumulation of hydrogen in the grain boundary, resulting in fragile grain boundaries. From the above, the presence of inclusions in the crystal and the amount of boron in the steel as much as possible can be used as an important means to improve cold cracking susceptibility.