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M30×410 mm的双头螺柱在使用中发生了断裂。通过宏观检查、断口扫描、金相检查、化学成分测定、力学性能检测、硬度梯度检测等方式对断裂原因进行分析。结果表明,螺柱的显微组织、化学成分、力学性能正常;螺柱断口具有典型的疲劳断裂特征,其断裂形式为疲劳断裂;螺柱断裂的主要原因是螺柱杆部表面产生的微裂纹在交变应力的持续作用下逐步扩展,最终造成断裂。
The M30 × 410 mm studs broke during use. The causes of fracture were analyzed by macroscopic inspection, fracture scanning, metallographic examination, chemical composition determination, mechanical property testing and hardness gradient detection. The results show that the stud has normal microstructure, chemical composition and mechanical properties. The fracture of the stud has the typical characteristics of fatigue fracture and the fracture form is fatigue fracture. The main reason of the stud fracture is the microcracks generated on the surface of the stud rod Gradual expansion under the continuous effect of alternating stress, eventually resulting in fracture.