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采用金相显微镜、扫描电镜和能谱仪等检测手段对焊丝钢MK700-Ⅱ表面横向裂纹进行了分析。结果表明:横向裂纹是因为原材表面有缺陷,导致延展性不一致形成拉拔横裂。
The transverse cracks on the surface of the wire MK700-Ⅱ were analyzed by means of metallographic microscope, scanning electron microscopy and energy dispersive spectroscopy. The results show that the transverse cracks are due to the defects on the surface of the raw material, leading to the inconsistent extensibility of drawing transverse rupture.