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一、前言我公司生产的55Si2Mn和60Si2 Mn钢坯,在低倍检验时,发现试片上有1～20多条锯齿形裂纹。我们在低倍、断口等常规检验的基础上,作了超声波探伤、白点低倍试片连续切片观察、扫描电镜和透射电镜观察,结果表明,这种锯齿形裂纹就是白点。进一步弄清了弹簧钢坯中白点的宏观和微观特征。这对深入研究白点的产生和指导生产实践都是很有意义的。二、方法取生产检验中初评为白点1.0～1.5级的5炉60Si2Mn,其中68mm方坯4炉、60mm方坯1炉。每炉任取2根试料,每根长1.5m。检验项目为:超声波探伤;横向酸
First, the preface Our company produces 55Si2Mn and 60Si2Mn billet, at low magnification test, found that there are more than 1 to 20 zigzag cracks on the test piece. On the basis of conventional inspection such as low magnification and fracture, we made ultrasonic flaw detection, continuous slicing observation of low spots of white spots, scanning electron microscopy and transmission electron microscopy. The results show that this zigzag crack is the white spot. Further clarify the macro white and white spring billet microscopic features. This is of great significance to the further study of the production of white spots and the guidance of production practice. Second, the method Take the production of the initial assessment of the white point 1.0 to 1.5 grade 5 furnace 60Si2Mn, of which 68mm billet 4 furnaces, 60mm billet 1 furnace. Take 2 samples for each furnace, each 1.5m long. Test items: ultrasonic testing; horizontal acid