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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,冷裂纹敏感性越能得到改善。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,使晶内存在适量的夹杂物和尽可能降低钢中的含硼量,可以作为改善对冷裂纹敏感性的重要手段。
In this study, horizontal butt-plug test and hydrogen embrittlement test will be carried out to study the cold crack sensitivity of low-alloy high-strength steel. From the results of the experiment, it can be concluded that inclusions in steel can be used as hydrogen traps to absorb 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 better the susceptibility to cold cracking. 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 description, it is an important means to improve the sensitivity to cold cracking by providing the proper amount of inclusions in the crystal and reducing the boron content in the steel as much as possible.