42CrMoA地质钻杆接头调质裂纹形成原因分析
Analysis of Causes of Quenching and Tempering Cracks in 42CrMoA Geological Drill Pipe Joint
骆晓炜1
作者信息
- 1. 中煤科工西安研究院(集团)有限公司,西安 710077
- 折叠
摘要
通过对失效接头的化学成分、力学性能、金相和扫描电镜能谱分析等检测项目,对42CrMoA加工的地质钻杆接头失效原因进行了全面分析.分析结果表明,该失效为淬火裂纹引起,是由于原材料中碳化铬夹杂物的存在和基体组织不均匀导致钢材内部形成应力集中点,破坏钢材的均匀性,进而引发淬火裂纹,裂纹顺着接头台肩处圆弧倒角应力集中点扩展,故形成了弧形和贯穿形复合裂纹.提出了降低此类失效发生的建议.
Abstract
A comprehensive analysis was conducted on the causes of failure of geological drill pipe joints processed with 42CrMoA through testing items such as chemical composition,mechanical properties,metallography,and scanning electron microscopy energy spectrum analysis of failed joints.The analysis results show that the failure is caused by quenching crack,because the existence of chromium carbide inclusions in raw materials and uneven matrix structure leads to the formation of stress concentration points inside the steel,which damages the uniformity of the steel and then causes quenching cracks.The crack propagates along the stress concentration point of the rounded chamfer at the joint shoulder,which is the stress concentration point,arc and through-shape composite cracks are formed.Some suggestions to reduce the occurrence of such failure were put forward.
关键词
42CrMoA/钻杆接头/失效原因/夹杂物/组织不均匀Key words
42CrMoA/drill pipe joint/cause of failure/inclusion/uneven structure引用本文复制引用
出版年
2025
NETL
NSTL
万方数据