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HORYNOVÁ, M. JULIŠ, M. ČELKO, L. ŠVEJCAR, J.
Original Title
Failure analysis of induction hardened injector body
Type
journal article in Web of Science
Language
English
Original Abstract
The failure analysis of induction hardened injector body was carried out to identify surface defects. Producer revealed the defects using nondestructive testing method and requested a detailed analysis to determine the cause of their origin. Metallographic and fracture analysis were performed to study the material microstructure and fracture surface. Metallographic analysis proved the existence of a crack, initiated from the front face of component. Microstructure of the crack vicinity as well as hardness was significantly different with increasing distance from the face of component. Microstructure near the front face consisted of coarse martensite, while finer martensitic structure was observed with increasing distance from the front face. Hardness showed decreasing tendency with increasing distance from the front face. Fractographic analysis revealed the intergranular cleavage fracture near the front face of component. With increasing distance from the front face, quasicleavage fracture was observed with increasing areal fraction characterized by ductile fracture. Due to significant difference in microstructure and corresponding difference in hardness within a small area of component can be assumed, that the crack initiation occurred due to internal stress of the material caused by heat treatment. It is necessary to optimize the parameters of induction hardening process with respect to the different thicknesses of the product.
Keywords
Failure analysis; Heat treatment; Internal stress; Metallography
Authors
HORYNOVÁ, M.; JULIŠ, M.; ČELKO, L.; ŠVEJCAR, J.
RIV year
2015
Released
1. 10. 2015
Publisher
Elsevier
Location
Spojené království Velké Británie a Severního Irska
ISBN
1350-6307
Periodical
ENGINEERING FAILURE ANALYSIS
Year of study
56
Number
1
State
United Kingdom of Great Britain and Northern Ireland
Pages from
538
Pages to
544
Pages count
7
URL
http://www.sciencedirect.com/science/article/pii/S1350630714003458
BibTex
@article{BUT115061, author="Miroslava {Horynová} and Martin {Juliš} and Ladislav {Čelko} and Jiří {Švejcar}", title="Failure analysis of induction hardened injector body", journal="ENGINEERING FAILURE ANALYSIS", year="2015", volume="56", number="1", pages="538--544", doi="10.1016/j.engfailanal.2014.10.017", issn="1350-6307", url="http://www.sciencedirect.com/science/article/pii/S1350630714003458" }