摘要
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 1Crl3 steel belt in rolling forming was studied by the morphology of macro and micro fracture test, metallographic examination, hardness test and mechanical performance test. The results show that the crack initiates at the cutting end surface of steel belt, which has a tendency to intergranular fracture along the substrate surface during rolling and coiling. The surface microstrueture of steel belt by using underwater plasma cutting produces change of quenching and tempering; the cutting surface forms hardened layer of about 700 μm thick （the hardness value is about 3 times ofsubstrate）. Due to lack of toughness in bending, the cracks are produced in the mierostrueture stress. The whole belt blank produces penetrating cracking in the bending process with crack propagation.
出处
《热加工工艺》
CSCD
北大核心
2014年第13期138-140,共3页
Hot Working Technology
关键词
1Cr13钢
钢带
断裂
硬化层
1Crl 3 steel
steel belt
fracture
hardened layer
