Please use this identifier to cite or link to this item: https://essuir.sumdu.edu.ua/handle/123456789/83420
Or use following links to share this resource in social networks: Recommend this item
Title Fracture Analysis of High-Strength Screw for Highway Construction
Authors Dubec, A.
Kováčiková, P.
Krmela, J.
Krmelová, V.
Artiukhov, Artem Yevhenovych  
Keywords fracture analysis
scanning electron microscopy
high-strength screw
intergranular fracture
tempering embrittlement
Type Article
Date of Issue 2021
URI https://essuir.sumdu.edu.ua/handle/123456789/83420
Publisher MDPI
License Creative Commons Attribution 4.0 International License
Citation Dubec, A.; Kováčiková, P.; Krmela, J.; Krmelová, V.; Artyukhov, A. Fracture Analysis of High-Strength Screw for Highway Construction. Materials 2021, 14, 1599. https://doi.org/10.3390/ma14071599
Abstract High-strength screws represent one of the main joining or fastening components which are commonly used in the process of installation of frame constructions for information boards or signposts, relating to the traffic roads. The control of the production process may not always be a sufficient method for ensuring road safety. The backward investigation and control of the screw material processing seems to be the one of the most important procedures when there is the occurrence of any failure during the operation of the screw. This paper is mainly focused on the analysis of the failure of the high-strength screw of 10.9 grade with M diameter of 27 × 3 and a shank length of 64 mm. The mentioned and investigated screw was used as a fastener in a highway frame construction. In the paper, there is mainly the analysis of the material for a broken screw in terms of the material micropurity, the material microstructure, the surface treatment as well as chemical composition. The evaluation was based on investigation by optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. Important knowledge and results were also obtained due to information on micromorphology and material contrast of the fracture surface resulting from fractographic analysis, using the method of scanning electron microscopy. In the case of the production of the high-strength screws, the tempering stands for the decisive or crucial process of heat treatment because the given process can ensure a decrease in hardness, while the required ductile properties of the material are kept and this is also reflected in the increase of strength and micromorphology of the fracture surface. From the aspect of micropurity, inclusions of critical size or distribution were not identified in the material, referring to Czech standard ČSN ISO 4967 (420471). The microstructure corresponds to tempered martensite, but the fracture surface of the broken screw was based on an intercrystalline micromechanism, which is undesirable for the given type of component. Combined with the measurement of the HV1 (Vickers hardness at a load of 1 kg) from the edge to the central area of the screw, the analysis revealed the significant drawbacks in the heat treatment of the high-strength screw.
Appears in Collections: Наукові видання (ННІ БіЕМ)

Views

China China
1
Germany Germany
1
Lithuania Lithuania
1
Netherlands Netherlands
161
Sweden Sweden
1
Ukraine Ukraine
79
United Kingdom United Kingdom
1
United States United States
330
Unknown Country Unknown Country
1

Downloads

Ukraine Ukraine
80
United Kingdom United Kingdom
1
United States United States
576
Unknown Country Unknown Country
1

Files

File Size Format Downloads
Dubec_et.al._Fracture_Analysis_2021_.pdf 17,15 MB Adobe PDF 658

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.