钢脚裂纹原因分析
Cause analysis of steel foot cracks
毕廉 1刘冬杰 1薛峰1
作者信息
- 1. 鞍钢集团北京研究院有限公司,北京 102209
- 折叠
摘要
通过金相显微镜、布氏硬度计和电感耦合等离子体发射光谱仪对钢脚裂纹进行分析.结果表明,钢脚非金属夹杂物较少,显微组织为调质态索氏体,与热处理工艺相符,化学成分满足GB/T 3077-2015要求.断口形貌呈细瓷状,未见疲劳开裂特点.整个裂纹两侧均未见脱碳、氧化、折叠形貌,为典型淬火裂纹形貌.开裂原因为大小工件同炉处理,造成小工件冷速过快,应力过大,进而形成开裂.
Abstract
Cracks of steel foot were analyzed by means of metallographic microscope,Brinell hardness tester and inductively coupled plasma emission spectrometer.The results show that the steel foot has fewer non-metallic inclusions,the metallographic structure is quenched and tempered sorbite,which is consistent with the heat treatment process,and the chemical composition meets the requirements of GB/T 3077-2015.The fracture morphology is fine porcelain like,without any fatigue cracking characteristics.No decarburization,oxidation or folding morphology is observed on both sides of the entire crack,indicating a typical quenching crack morphology.The reason for cracking is that the large and small workpieces are treated in the same furnace,causing the cooling rate of small workpieces to be too fast and the stress to be too high,leading to crack.
关键词
钢脚/淬火裂纹/原因分析Key words
steel foot/quenching crack/cause analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据