Microstructure Characteristics and Surface Residual Stress of Iron-Based Alloy Coating by Laser Cladding

2014 ◽  
Vol 696 ◽  
pp. 70-75 ◽  
Author(s):  
Ying Zi Wang ◽  
Yan Hua Zhao ◽  
Jie Sun
Keyword(s):  
Residual Stress ◽  
Cast Iron ◽  
Laser Cladding ◽  
Alloy Coating ◽  
Grey Cast Iron ◽  
Wear Properties ◽  
Surface Residual Stress ◽  
Dense Microstructure ◽  
Grey Cast ◽  
Iron Based

Laser cladding is an effective mean to repair the damaged components in remanufacture industry. The iron-based alloy coating was obtainment by laser cladding on grey cast iron (HT250). The microstructure and morphology of laser cladding were observed by using scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The micro hardness of laser cladding coating was tested. The wear properties of grey cast iron and laser cladding coating at room temperature without lubrication were evaluated by sliding wear tests. The distribution regularity of surface residual stress of substrate and cladding coating was obtained. It was shown that the laser cladding coating on grey cast iron has a homogeneous and dense microstructure. It was observed that the laser cladding coating presents a great hardness and excellent wear resistance. Tensile stress was generated in the surface of laser cladding coating.

scholarly journals The Effect of Copper Addition on the Mechanical and Wear Properties of Grey Cast Iron

2014 ◽  
Vol 02 (05) ◽  
pp. 470-483 ◽  
Author(s):  
J. O. Agunsoye ◽  
S. A. Bello ◽  
S. B. Hassan ◽  
R. G. Adeyemo ◽  
J. M. Odii
Keyword(s):  
Cast Iron ◽  
Grey Cast Iron ◽  
Wear Properties ◽  
Copper Addition ◽  
Grey Cast ◽  
Effect Of Copper

scholarly journals Laser Cladding Treatment for Refurbishing Disc Brake Rotors: Environmental and Tribological Analysis

2021 ◽  
Vol 69 (2) ◽  
Author(s):  
Ulf Olofsson ◽  
Yezhe Lyu ◽  
Anna Hedlund Åström ◽  
Jens Wahlström ◽  
Senad Dizdar ◽  
...  
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Tribological Performance ◽  
Point Of View ◽  
Grey Cast Iron ◽  
Disc Brake ◽  
Brake Rotor ◽  
Grey Cast ◽  
Tribological Analysis ◽  
Brake Rotors

AbstractIn this study, grey cast iron disc brake rotors are refurbished by adding a surface layer through laser cladding. Current methods to deal with replaced rotors mainly include remelting, with a minority fraction disposed in landfill. Both approaches result in a huge waste of resources and an increase in CO2 footprint. From a sustainable point of view, this study aims to evaluate the feasibility of refurbishing brake rotors by a combined environmental and tribological performance approach. A streamlined life cycle assessment is conducted to compare the environmental impacts between producing virgin grey cast iron brake rotors and refurbishing replaced brake rotors by laser cladding. It turns out that the energy consumption and CO2 footprint of the laser cladding refurbished brake rotors are 80% and 90% less than the virgin brake rotors. The results show that the refurbished brake rotor yields higher friction compared to the original cast iron utilizing the same pad material. The wear and particle emissions of the disc brake contact are in this study higher for the laser-cladded one compared to the original cast iron one.

Laser cladding treatment for refurbishing disc brake rotors – environmental and tribological analysis

2021 ◽  
Author(s):  
Ulf Olofsson ◽  
Yezhe Lyu ◽  
Anna Hedlund Åström ◽  
Jens Wahlström ◽  
Dizdar Senad ◽  
...  
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Tribological Performance ◽  
Point Of View ◽  
Grey Cast Iron ◽  
Disc Brake ◽  
Brake Rotor ◽  
Grey Cast ◽  
Tribological Analysis ◽  
Brake Rotors

Abstract In this study, grey cast iron disc brake rotors are refurbished by adding a surface layer through laser cladding. Current methods to deal with replaced rotors mainly include re-melting, with a minority fraction disposed in landfill. Both approaches result in a huge waste of resources and an increase in CO 2 footprint. From a sustainable point of view, this study aims to evaluate the feasibility of refurbishing brake rotors by a combined environmental and tribological performance approach. A streamlined life cycle assessment is conducted to compare the environmental impacts between producing virgin grey cast iron brake rotors and refurbishing replaced brake rotors by laser cladding. It turns out that the energy consumption and CO 2 footprint of the laser cladding refurbished brake rotors are 80% and 90% less than the virgin brake rotors. The results show that the refurbished brake rotor yields higher friction compared to the original cast iron utilizing the same pad material. The wear and particle emissions of the disc brake contact are in this study higher for the laser cladded one compared to the original cast iron one.

Preparations of iron-based alloy coatings on grey cast iron through plasma transfer arc welding

2021 ◽  
pp. 1-12
Author(s):  
Pei-hu Gao ◽  
Bai-yang Chen ◽  
Bo Zhang ◽  
Zhong Yang ◽  
Yong-chun Guo ◽  
...  
Keyword(s):  
Cast Iron ◽  
Arc Welding ◽  
Grey Cast Iron ◽  
Grey Cast ◽  
Iron Based

scholarly journals Simulation of thermal and mechanical performance of laser cladded disc brake rotors

2021 ◽  
pp. 135065012110091
Author(s):  
Nicholas Athanassiou ◽  
Ulf Olofsson ◽  
Jens Wahlström ◽  
Senad Dizdar
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Adhesive Bonding ◽  
Mechanical Performance ◽  
Grey Cast Iron ◽  
Brake Disc ◽  
Particle Emissions ◽  
Brake Discs ◽  
Overlay Welding ◽  
Grey Cast

Disc brakes wear during braking events and release airborne particulates. These particle emissions are currently one of the highest contributors to non-exhaust particle emissions and introduce health hazards as well as environmental contamination. To reduce this problem, wear and corrosion-resistant disc coatings have been implemented on grey cast iron brake disc rotors by using various deposition techniques such as thermal spraying and overlay welding. High thermal gradients during braking introduce risks of flaking off and cracking of thermally sprayed coatings with adhesive bonding to the substrate. Overlay welding by laser cladding offers metallurgical bonding of the coating to the substrate and other benefits that motivate laser cladding as a candidate for the coating of the grey cast iron brake discs. This study aims to investigate the effect of laser cladding on the thermal and thermo-structural performance of the coated grey cast iron brake discs. Therefore, thermal and thermo-stress analysis with COMSOL Multiphysics 5.6 software is performed on braking events of grey cast iron brake discs as non-coated – reference and laser cladding coated with stainless steel welding consumables. The Results demonstrated that surface temperatures were more localised, overall higher in the laser cladded coating with over three times the stresses attained of reference grey cast iron discs. The output of the simulations has been compared by tests found in the literature. Laser cladding presented higher reliability and braking performance, nonetheless requiring the evaluation of its thermal impact on other system components.

scholarly journals Effect of Silicon Additions on the Wear Properties of Grey Cast Iron

2013 ◽  
Vol 01 (02) ◽  
pp. 61-67 ◽  
Author(s):  
Johnson O. Agunsoye ◽  
Talabi S. Isaac ◽  
Olumuyiwa I. Awe ◽  
Afemefuna T. Onwuegbuzie
Keyword(s):  
Cast Iron ◽  
Grey Cast Iron ◽  
Wear Properties ◽  
Grey Cast
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