New Search

Advanced search
Export article
Open Access

Fracture Analysis of the Chain Pin Shaft of an Escalator Ladder

Chenghong Peng, Weiheng Zhu, Ling Chen, Xiaoke Zhu, Zhiling Chen
IOP Conference Series: Materials Science and Engineering , Volume 730; doi:10.1088/1757-899x/730/1/012020

Abstract: This study analyzed the cause of fracture for the chain pin shaft of an escalator ladder, and found that the pin material satisfied the chemical composition content requirements of the GB 20CrMo steel standard and similar to ASTM A29/A29M-2012 grade 4120. Abnormal metallurgical quality defects were not found in the pin. The pin shaft was carburized, and internal oxidation defects were not observed on the surface as a result of carburization. The internal structure of the material was uneven, there existed a mixed grain structure, and the martensite structure was coarse at particular regions, to seven grade. Additionally, the martensite structure in the carburized layer was slightly coarser, four to five grade, which had an adverse effect on the pin strength. The pin break was a fatigue fracture caused by multiple cumulative damages. The fracture originated on the surface of the pin, and may have been caused by indentation on the pin's surface.
Keywords: Indentation / structure / defects / PIN / Martensite / Shaft / ladder / Escalator / Fracture Caused

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

Share this article

Click here to see the statistics on "IOP Conference Series: Materials Science and Engineering" .
References (2)