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研究了 JW 钢板中的带状组织的本质及其对拉伸和冲击行为的影响。结果表明,控冷和空冷时带状组织的形成是由连铸时镍、铬、锰、硅、碳等合金元素枝晶偏析呈带状分布所致。带状组织中分布着 MnS 和硅酸盐等非金属夹杂物条带。拉伸或缺口试样冲击时,裂纹从非金属夹杂物处萌生,在控冷或空冷的高温回火组织中,裂纹多沿粒状组织基体 MF 界面扩展。带状组织导致各向异性和纵向分层裂纹,这对纵向缺口试样冲击具有显著的增韧作用。
The nature of ribbon structure in JW steel and its effect on tensile and impact behavior were investigated. The results show that the formation of banded structure during controlled cooling and air cooling is caused by the dendritic segregation of alloying elements such as nickel, chromium, manganese, silicon and carbon during the continuous casting. Banded organizations are distributed with MnS and silicate non-metallic inclusions bands. In tensile or notched specimens, cracks originate from non-metallic inclusions. In controlled or cold-tempered high-temperature tempering structures, the cracks expand along the MF interface of granular matrix. Banding results in anisotropic and longitudinal delamination cracks, which have significant toughening effects on longitudinal notched specimen impact.