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对高强韧低碳贝氏体钢采用X-射线CT技术测试不同拉伸变形量的孔洞数量和体积百分率。结果表明,随着拉伸变形量的增加,孔洞数量不断增加,但增加缓慢,直到拉伸断裂前,孔洞才快速急剧增加。断裂变形量21%时的孔洞数几乎是19%变形量孔洞数的17倍,孔洞体积百分率的比值更是达到18.2倍。高强韧钢铁材料的韧性断裂机制是裂纹和因夹杂物引起的单个孔洞逐步连接,最后与大量A/M岛萌生的小孔洞汇合连接而发生韧性断裂。
X-ray CT technique was used to test the number of holes and the volume percentage of high tensile low carbon bainitic steel with different tensile deformation. The results show that as the amount of tensile deformation increases, the number of holes increases, but the increase slowly, until the tensile fracture before the rapid sharp increase in the hole. The number of holes at 21% of the amount of fracture deformation is almost 17 times the number of holes at 19% of the amount of deformation, and the ratio of the volume percentage of holes is even 18.2 times. The ductile fracture mechanism of high-toughness steel is that the cracks and the single holes caused by inclusions are gradually connected, finally, the ductile fracture occurs when a large number of small holes in the A / M island are merged.