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螺纹塞规上的裂纹塞规上的裂纹总是在塞规的各造工序都已结束时才出现(图1),有时候废品率很高。在任何情现下裂纹总是散布在塞规的工作部分且与沙轮运行方向垂直,裂纹很深,几乎是直线形的,有些塞规上达5公厘以上。裂纹表面洁净,未氧化。研究了裂纹产生处腐蚀试片与未腐蚀试片的显微组织后证实,金属内没有碳化物偏析状的缺陷,也没有原来状态的化
Cracks in the plug gauges Cracks in the plug gauges always occur at the end of the plug gauges (Figure 1), sometimes with high rejects. In any case, the crack is always scattered in the working part of the plug gauge and perpendicular to the running direction of the sand wheel. The crack is deep and almost linear with some plug gauges up to 5 mm. Crack the surface clean, not oxidized. After studying the microstructure of the corrosion test piece and the non-corrosion test piece at the place where the crack was generated, it was confirmed that there is no defect of carbide segregation in the metal and there is no change in the original state