Failure analysis of the 18CrNi3Mo steel for drilling bit

Sheng Xu, Ya Zheng Liu, Le Yu Zhou, Yong Ming Yan, Hong Wu Zhu

研究成果: Review article査読

5 被引用数 (Scopus)

抄録

The failure cause of the 18CrNi3Mo steel for drilling bit, including inclusions, prior austenite grain size, carburized layers, and morphology of the fatigue fracture, was investigated by optical microscope, quantitative metallography, and scanning electron microscope. Results show that the failure of the drill bit is not related to interior inclusions or the inhomogeneity of the prior austenite grain size distribution. The failure is related to geometrical discontinuities causing stress concentration along the tooth profiles while under effect of continuous twisting and axial impact. Thus, the crack initiates in these areas, and the microstructures of the carburized layer, the transitive layer, and the matrix are all tempered martensite such that the crack propagation cannot be effectively restrained and the crack propagates quickly, causing premature failure of the drilling bit.

本文言語English
ページ(範囲)183-190
ページ数8
ジャーナルJournal of Failure Analysis and Prevention
14
2
DOI
出版ステータスPublished - 2014 4月
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 安全性、リスク、信頼性、品質管理
  • 材料力学
  • 機械工学

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