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高碳钢丝经过冷拉后可得到较高的强
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 gradually.
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 gradually.
