Fe-Cr-C-TiC High-Chromium Fe-Based Ceramic Composite Coating Prepared by PTA Weld-Surfacing Process

2011 ◽  
Vol 675-677 ◽  
pp. 783-787 ◽  
Author(s):  
Li Mei Wang ◽  
Jun Bo Liu ◽  
Chi Yuan
Keyword(s):  
Composite Coating ◽  
Ceramic Composite ◽  
Steel Substrate ◽  
Wear Properties ◽  
High Chromium ◽  
Q235 Steel ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Microhardness Tester

In situ synthesized Fe-Cr-C-TiC high-chromium Fe-based ceramic composite coating was fabricated on substrate of Q235 steel by plasma transferred arc (PTA) weld-surfacing process using the mixture of ferrotitanium, ferrochromium, ferroboron and ferrosilicium powders. The microstructure and wear properties of the composite coating were investigated by XRD, SEM, EDS, microhardness tester and wear tester. Results show that the coating consists of TiC, (Cr,Fe)7C3 and austenite. The coating is metallurgically bonded to the Q235 steel substrate. TiC particles formed by PTA weld-surfacing process present cubic, dendrite and flower-like shape. The wear resistance of the composite coating is approximately 11 times higher than that of the base body Q235. As the load increases, the wear mass loses slowly, which demonstrates the composite coating has excellent load character.

Microstructure and Wear Properties of TiC/Fe-Based Composite Coating Prepared by PTA Weld-Surfacing Process

2013 ◽  
Vol 652-654 ◽  
pp. 1780-1786
Author(s):  
Zhong Li Zhao ◽  
Kai Fang Dang ◽  
Jun Hai Liu ◽  
Da Ming Wu ◽  
Ying Liu ◽  
...  
Keyword(s):  
Composite Coating ◽  
Adhesive Wear ◽  
Steel Substrate ◽  
Wear Test ◽  
X Ray Diffraction ◽  
Scanning Electron Micrograph ◽  
Wear Properties ◽  
X Ray ◽  
Q235 Steel ◽  
Plasma Transferred Arc

The TiC/Fe-based composite coating was fabricated by plasma transferred arc (PTA) weld-surfacing process on substrate of Q235 steel with the mixture of ferrotitanium, ferrochromium and ferrosilicium powders. The microstructure and wear properties of the coating were investigated by means of X-ray diffraction (XRD), scanning electron micrograph (SEM), energy dispersive X-ray analysis (EDS), microhardness test and wear test. The results show that the coating consists of TiC, (Cr,Fe)7C3 and austenite. The composite coating is metallurgically bonded to the Q235 steel substrate. TiC particles formed by PTA weld-surfacing process presented cubic or “dendrite flower-like” morphology. The wear-resisting property of the coating was greatly improved compared with the substrate. The coating has excellent adhesive wear and grinding abrasion resisting force.

Microstructure and Wear Resistance of In Situ Synthesized TiC-TiB2 Particulate Reinforced Ni-Based Composite Coating by Argon-Arc Cladding

2014 ◽  
Vol 1004-1005 ◽  
pp. 763-767
Author(s):  
Zhen Ting Wang ◽  
Fan Feng
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Steel Substrate ◽  
Energy Dispersive Spectrometer ◽  
X Ray Diffraction ◽  
Q235 Steel ◽  
Clad Layer ◽  
Precursor Powders ◽  
Particulate Reinforced

In situ synthesized TiC-TiB2reinforced Ni based coating was fabricated by argon arc cladding on Q235 steel substrate using titanium, boron carbide, Ni60 as the precursor powders. The phase composite on and microstructure of the clad layer were investigated by means of X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and Energy Dispersive Spectrometer (EDS). The results show that uniformly distributed TiC particles with the black petals shape and TiB2particles with rod shape could be synthesized by the situ reaction. Compared to those unreinforced Q235 steel substrate, the hardness and the wear resistance of TiC-TiB2reinforced Ni based composite coating were significantly enhanced.

Influence of Heat Treatment on Characteristic Behavior of Co-Based Alloy Hardfacing Coatings Deposited by Plasma Transferred Arc Welding

2011 ◽  
Vol 462-463 ◽  
pp. 593-598 ◽  
Author(s):  
Hong Xia Deng ◽  
Hui Ji Shi ◽  
Seiji Tsuruoka ◽  
Hui Chen Yu ◽  
Bin Zhong
Keyword(s):  
Residual Stresses ◽  
Vickers Hardness ◽  
Arc Welding ◽  
Steel Substrate ◽  
Heat Treatments ◽  
Material System ◽  
Coating Surface ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Plasma Transferred Arc Welding

The Plasma transferred arc welding (PTAW) is widely used for hardfacing components exposed to severe conditions. Without post welding heat treatments, large tensile residual stresses remain in the hardfacing coating, which is detrimental. In this paper, a set of post welding heat treatments was evaluated for the heat-resistant steel substrate – Co-based alloy hardfacing coating system. Microstructural and mechanical properties, including the chemical phases of coating surface, the microstructure of coating surface, the Vickers hardness and the residual welding stress, were investigated before and after the heat treatments. Results revealed that during the heat treatments, some elements reprecipitated and the secondary carbide Cr23C6 was formed. After the treatments, a more regular structure and a higher Vickers hardness were obtained. Moreover, the tensile residual stresses in the coating decreased significantly. Therefore, it can be inferred that the post welding heat treatments employed in this paper were proper for this material system.

scholarly journals Microstructural and Corrosion Behavior of High Velocity Arc Sprayed FeCrAl/Al Composite Coating on Q235 Steel Substrate

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 542 ◽  
Author(s):  
Ndumia Joseph Ndiithi ◽  
Min Kang ◽  
Jiping Zhu ◽  
Jinran Lin ◽  
Samuel Mbugua Nyambura ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
High Velocity ◽  
Steel Substrate ◽  
Arc Spraying ◽  
Spray Parameters ◽  
Q235 Steel ◽  
Electrochemical Tests ◽  
Al Composite ◽  
Al Coating

High velocity arc spraying was used to prepare FeCrAl/Al composite coating on Q235 steel substrate by simultaneously spraying FeCrAl wire as the anode and Al wire as the cathode. The composite coating was sprayed with varying voltage and current to obtain optimum coating characteristics. FeCrAl coating was also prepared for comparison purposes. The surface microstructure of the coatings was characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The average microhardness of the coatings and the substrate was analyzed and compared. Corrosion resistance was investigated by means of electrochemical tests. The image results showed that a lamellar structure consisted of interwoven layers of FeCrAl and Al. Al and FeCr constituted the main phases with traces of oxides and AlFe intermetallic compounds. The average porosity was reduced and microhardness of the coatings was improved with increasing voltage and current. The FeCrAl/Al coating formed alternating layers of hard and ductile phases; the corrosion resistance of the coatings in the sodium chloride (NaCl) solution depended on the increase in Al content and spray parameters. The corrosion resistance tests indicated that FeCrAl/Al coating had a better corrosion resistance than the FeCrAl coating. FeCrAl/Al can be used to coat steel substrates and increase their corrosion resistance.

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