北京科技大学学报2013，Vol.35Issue(5)：613-619,7.
22Si2MnCrNi2MoA钎杆断裂失效分析
Failure analysis of 22Si2MnCrNi2MoA drilling rods
朱洪武 1刘雅政 1周乐育 1王磊英 2黄斌2
作者信息
- 1. 北京科技大学材料科学与工程学院,北京100083
- 2. 西宁特殊钢股份有限公司,西宁810005
- 折叠
摘要
Abstract
The fracture of a 22Si2MnCrNi2MoA drilling rod near the internal thread was analyzed in term of the microstructure,inclusions and fractograph by means of optical microscopy,scanning electron microscopy and energy dispersive spectroscopy.Fatigue crack initiation and propagation in the drilling rod were studied.It is found that the fracture of the drilling rod is not induced by the abnormal microstructure and inclusions.Instead,because the wall thickness of the drilling rod near the internal thread is obviously uneven,the area with a thinner wall thickness tends to be the weak load-bearing point under the continuous stress of high frequency,serious outside consumption and internal friction existing simultaneously.Thus,fatigue cracks are likely to emerge in the area preferentially.After that,the drilling rod ruptures in the area and eventually fractures.Furthermore,this fatigue failure is originated from the inside surface of the drilling rod and it belongs to the fatigue fracture with many crack sources.The morphology of the zones around the crack sources is dimple fracture,but the morphology of the zones of crack propagation is a mixed type with dimple and intergranular fracture.关键词
工具钢/钎杆/失效分析/疲劳损伤/裂纹萌生/裂纹扩展Key words
tool steel/ drilling rods/ failure analysis/ fatigue damage/ crack initiation/ crack propagation分类
矿业与冶金引用本文复制引用
朱洪武,刘雅政,周乐育,王磊英,黄斌..22Si2MnCrNi2MoA钎杆断裂失效分析[J].北京科技大学学报,2013,35(5):613-619,7.
