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从轧后出现的在线超声探伤不合格的钢板上取样,在缺陷处进行金相组织检验,并根据检验结果,利用裂纹扩展的基础理论进行分析,认为连铸坯的中心偏析是钢板在线探伤合格率偏低的根本原因,中心偏析的存在不仅有利于裂纹源硫化物的生成,也会导致钢板中心出现脆硬的贝氏体和马氏体组织,为裂纹源的扩展提供条件,这些硫化物及其引发的裂纹促使氢原子的聚集和结合。这些缺陷综合在一起,最终降低了钢板在线探伤的合格率。
From the appeared on-line ultrasonic flaw detection after substandard sampling on the steel plate, the defect at the metallographic examination, and based on test results, the use of crack propagation based on the analysis of the theory that the slab center segregation is steel online testing qualified The root causes of low rate, the existence of center segregation not only conducive to the generation of crack source sulfide, but also lead to brittle bainite and martensite in the center of the plate, provided the conditions for the expansion of the source of these sulfides The cracks caused by it promote the aggregation and bonding of hydrogen atoms. These defects together, and ultimately reduce the on-line testing of steel pass rate.