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A36船板拉伸试验时,断口出现批量分层。通过宏观观察、扫描电镜及能谱仪分析、光学显微观察对分层缺陷进行了深入探讨,结果表明:分层位于板厚中部,该部位存在明显偏析及夹杂物富集,氢原子在该部位聚集结合形成氢气,当内压力足够大时,局部开裂,形成白点,加上偏析及夹杂物富集使板厚中部较脆,拉伸时在Z向应力作用下形成分层。可通过严格控制冶炼工艺,强化钢液脱硫、低过热度浇注,电磁搅拌等以及提高原材料质量以减少钢中氢含量等途径加以解决。
A36 shipboard tensile test, the fracture appears layered. The results of optical microscopic observation of the delamination defects show that the delamination is located in the central part of the plate thickness and there are obvious segregation and inclusion enrichment in this part. When the internal pressure is large enough, it will crack locally to form white spots. When segregation and inclusion enrichment make the central part of the plate thickness more brittle, stratification will be formed under the Z-direction stress during stretching. Through strict control of the smelting process, strengthen the molten steel desulfurization, low superheat pouring, electromagnetic stirring, as well as improve the quality of raw materials to reduce the hydrogen content of steel and other means to be resolved.