高碳钢丝经过冷拉后可得到较高的强度,当钢丝强度增加到一定程度时,钢丝分层现象随之发生,钢丝韧性下降。分层现象表现在钢丝拉伸或扭转试验时会产生纵向裂纹或开裂,扭转试验可有效地判断钢丝是否分层。在扭转试验中,常用的表征指标有扭转次数、断口形貌和扭矩-扭角曲线。
High carbon steel wire can get high strength after cold drawing. When
the strength of steel wire increases to a certain extent, the phenomenon
of steel wire delamination occurs, and the toughness of steel wire
decreases. The phenomenon of delamination is that the steel wire will
produce longitudinal crack or crack during tensile or torsional test.
Torsional test can effectively judge whether the steel wire
delamination. In torsion test, the commonly used characterization
indexes are torsion times, fracture morphology and torsion angle curve.
2 钢丝分层的判断和检测方法
2. Judgment and detection method of steel wire delamination
在钢丝的单向扭转
粪池模具 路缘石模具 唐山通风管道 塑钢电缆挂钩 钢纤维 钢制拍门 植绒机 铜雕佛像试验
液压钢坝 中,若钢丝不发生分层,扭矩逐渐增加至钢丝断裂,钢丝断口呈平齐状。钢丝分层的特征:扭转次数较低,断口呈螺旋状,扭矩-扭角曲线存在快速下降后再逐渐增加至断裂。
In the one-way torsion test of steel wire, if there is no delamination
of steel wire, the torque will gradually increase to steel wire
fracture, and the fracture of steel wire will be even. The
characteristics of steel wire delamination: the number of torsion is
low, the fracture is spiral, and the curve of torque torsion angle
decreases rapidly, then increases to fracture graduall