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通过断口形貌的宏观与微观检验、金相检验、硬度检验及力学性能试验对1Cr13钢带卷制成形过程中的断裂机制进行了研究。结果表明,裂纹源位于钢带切割端面处,在卷制过程中沿着基体面有沿晶断裂倾向;带钢板材料采用水下等离子切割后表层组织发生了淬火与回火转变,切割面形成了约700μm厚的硬化层组织(硬度值为基材的3倍左右);受弯时由于韧性不足,在组织应力的作用下萌生裂纹,随着裂纹的扩展,导致整个钢带毛坯在弯制过程中发生贯穿性开裂。
The fracture mechanism of 1Cr13 steel strip was studied by macro and micro test, metallographic test, hardness test and mechanical test. The results show that the crack source is located at the cutting end of the strip and has a tendency of intergranular fracture along the surface of the strip during the rolling process. After the strip material is cut by underwater plasma, the surface microstructure undergoes quenching and tempering transformation, About 700μm thick layer of hardened tissue (hardness value of about 3 times the substrate); due to the lack of toughness when bending under the stress of tissue initiation crack, with the crack growth, resulting in the entire steel blank in the bending process In the occurrence of penetration cracking.