论文部分内容阅读
大规格的82B盘条在拉伸试验中发现,力学性能差的断口均为脆性平齐断口,并且断口上总有1~2个黑心,每个黑心上均有1个白点,将这种断口称为黑心白点断口(简称BCWPF)。对常用直径(10.0、12.5、14.0mm)的这种黑心白点断口,用体式显微镜观察宏观形貌,用电镜观察微观形貌,用能谱进行微区元素分析,对断口材料本身的组织和夹杂物进行定性定量分析,发现断口的黑心白点主要由氧化铝类和硫化物类非金属夹杂物组成,部分还有球状氧化物类和硅酸盐类夹杂物。通过使用不含铝的硅锰脱氧剂来降低氧化铝夹杂,深脱硫来降低硫化物类夹杂,夹杂物的塑性改造后,拉伸断口的黑心白点现象明显减少,盘条的力学性能得到显著提高。
Large-scale 82B wire rod in the tensile test found that poor mechanical properties of the fracture are brittle flat fracture, and the fracture there are always 1 or 2 black heart, each black heart has a white point, this Fracture called black heart white point fracture (referred to as BCWPF). The commonly used diameter (10.0,12.5,14.0mm) of this black heart white point fracture, the use of body-type microscope to observe the macroscopic morphology, electron microscopy microscopic morphology, energy spectrum analysis of micro-elements, the fracture of the material itself and the organization Qualitative and quantitative analysis of inclusions and found that the black heart white fracture mainly composed of alumina and sulfide non-metallic inclusions, some spherical oxides and silicate inclusions. Through the use of aluminum-free Si-Mn deoxidizer to reduce the inclusion of alumina, deep desulfurization to reduce sulfide inclusions, inclusions after plastic transformation, black stretch white white point phenomenon significantly reduced the mechanical properties of the wire rod was significantly improve.