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利用X -射线应力仪和扫描电镜分别测试、观察了 4Cr13线材轧后不同冷却速率下表面宏观应力和微观组织。研究结果表明表面裂纹是因冷却速率过快所造成的。
The X - ray stress and scanning electron microscope were used to test the macroscopic stress and microstructure of the surface after 4Cr13 wire rod rolling under different cooling rates. The results show that the surface cracks caused by the cooling rate too fast.