Abstract:  The 150 mm thick steel cladding plate is rolled by two block 365 mm cladding bloom, the delamination crack at 1/2 thickness of quenched-tempered cladding plate occurs when cutting four sides by flame. Analysis results show that quenching delamination crack is induced by the inclusions in central cladding interface together with the quenching stress. When the cladding bloom welding vacuum decreases from 5 x 10^-2 Pa to 1 x 10 ^-2 Pa,the cladding plate is not found inclusions in cladding interface and the delamination crack at 1/2 thickness cladding plate does not occur.

摘要： 采用2块365mm复合坯轧制成150mm厚钢板,该板经淬火和回火处理后,火焰切割四边时发现在1/2厚度处出现分层开裂。分析结果表明,调质分层开裂是由中心复合面处存在的夹杂物和调质时的淬火应力综合作用导致的。当复合坯焊接的真空度由5×10^-2 Pa降低到1×10^-2 Pa时,复合面处未发现夹杂物,调质复合板1/2厚度处未出现分层开裂现象。

关键词: 低碳合金钢复合板, 淬火分层开裂, 夹杂物, 界面