scholarly journals Tribological Properties of Solid Solution Strengthened Laser Cladded NiCrBSi/WC-12Co Metal Matrix Composite Coatings

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 342
Author(s):  
Zoran Bergant ◽  
Barbara Šetina Batič ◽  
Imre Felde ◽  
Roman Šturm ◽  
Marko Sedlaček
Keyword(s):  
Solid Solution ◽  
Sliding Mode ◽  
Electron Backscatter Diffraction ◽  
Composite Coatings ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Fatigue Wear ◽  
Material Loss ◽  
Nicrbsi Coating ◽  
Disc Configuration

NiCrBSi, WC-12Co and NiCrBSi with 30, 40 and 50 wt.% WC-12Co coatings were produced on low carbon steel by laser cladding with an Nd:YAG laser with a multi-jet coaxial cladding-nozzle. The microstructure properties after WC-12Co alloying were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and Vickers hardness tests. The resulting microstructures consisted of a γ-Ni and Ni3B matrix, strengthened with Co and W, Ni3Si, CrB, Cr7C3, Cr23C6, WC/W2C phases. In coatings with 30, 40 and 50 wt.% WC-12Co, a solid solution, strengthened multi-matrix NiCrWCo phase formed, which yielded a higher matrix hardness. Wear tests that monitored the friction coefficients were performed with a tribometer that contained a ball-on-disc configuration, Al2O3 counter-body and reciprocal sliding mode at room temperature. The major wear mode on the NiCrBSi coatings without the WC-12Co was adhesive with a high wear rate and visible material loss by flaking, delamination and micro-ploughing. The addition of WC-12Co to the NiCrBSi coating significantly increased the wear resistance and changed the major wear mechanism from adhesion to three-body abrasion and fatigue wear.

Thermodynamics of Modifying Effect and Experiment Research of Rare Earth in Plasma Jet Surface Metallurgy

2011 ◽  
Vol 214 ◽  
pp. 89-92
Author(s):  
Hao Chen ◽  
Jian Gao Yang ◽  
Mi Song Chen
Keyword(s):  
Rare Earth ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Low Carbon Steel ◽  
Plasma Jet ◽  
Low Carbon ◽  
Experiment Research ◽  
Modifying Effect ◽  
Solidification Crack ◽  
Better Than

The Fe-based composite coatings with RE oxides were prepared on low-carbon steel substrate by use of the plasma jet surface metallurgy, and the effect of RE on microstructure of coating was investigated. The result shows that the microstructure and properties with a proper amount of RE oxides are better than these of the coatings without RE oxides. In addition, the modifying effect of RE oxide on inclusions in metallurgical coating was studied by means of thermodynamics. The thermodynamics analysis shows that RE oxide (Ce2O3) can be reduced to RE by carbon, then the RE element can react with oxygen and sulfur to form the RE oxide-sulfide in metallurgical pool. As a result, the coating is purified and the solidification crack of coating can be restrained by deoxidization and desulphurization.

Microstructure and Properties of Fe-Based Composite Coating by Plasma Jet Surface Metallurgy

2011 ◽  
Vol 179-180 ◽  
pp. 253-256
Author(s):  
Hao Chen ◽  
Jian Gao Yang ◽  
Mi Song Chen
Keyword(s):  
Steel Substrate ◽  
Composite Coatings ◽  
Low Carbon Steel ◽  
Plasma Jet ◽  
Optical Microscope ◽  
Al Alloy ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
Metallurgical Bonding

The Fe-based composite coatings were formed by plasma jet surface metallurgy using Fe, C, W, Cr and Al alloy powders on the low carbon steel. The morphology, microstructure, interface structure and the distribution of the in situ particles in the coatings were observed with optical microscope, scanning electron microscope and x-ray diffraction analysis. The results show that metallurgical bonding is obtained between coating and substrate, and the microstructure of coatings is mainly composed of γ-Fe, (Fe,Cr,W,Nb)7C3 and AlFe particles which are synthesized in stiu, are dispersivly distributed in the coatings. The micro-hardness gradually increased from bottom to the top of the coating, the maximum is 986 Hv0.1, about 4 times larger than that of the steel substrate.

The Application of 3D-EBSD for Investigating Texture Development in Metals and Alloys

2011 ◽  
Vol 702-703 ◽  
pp. 469-474
Author(s):  
Michael Ferry ◽  
M. Zakaria Quadir ◽  
Nasima Afrin Zinnia ◽  
Lori Bassman ◽  
Cassandra George ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Electron Backscatter Diffraction ◽  
Ion Beam ◽  
Low Carbon Steel ◽  
Texture Development ◽  
Data Generation ◽  
Low Carbon ◽  
Resolution Electron ◽  
Multi Phase ◽  
Backscatter Diffraction

A focused ion beam (FIB) coupled with high resolution electron backscatter diffraction (EBSD) has emerged as a useful tool for generating crystallographic information in reasonably large volumes of microstructure. In principle, data generation is reasonably straightforward whereby the FIB is used as a high precision serial sectioning device for generating consecutive milled surfaces suitable for mapping by EBSD. However, there are several challenges facing the technique including the need for accurate reconstruction of the EBSD slice data and the development of methods for representing the myriad microstructural features of interest including, for example, orientation gradients arising from plastic deformation through to the structure of grains and their interfaces in both single-phase and multi-phase materials. This paper provides an overview of the use of 3D-EBSD in the study of texture development in alloys during deformation and annealing and includes an update on current research on the crystallographic nature of microbands in some body centred and face centred cubic alloys and the nucleation and growth of grains in an extra low carbon steel.

Microstructure and Properties of Fe-Based Amorphous Composite Coating Prepared by Pulse Laser

2016 ◽  
Vol 849 ◽  
pp. 642-646 ◽  
Author(s):  
Run Sen Jiang ◽  
Yong Tian Wang ◽  
Jin Tang ◽  
Gang Xu ◽  
Zong De Liu
Keyword(s):  
Pulse Laser ◽  
Composite Coatings ◽  
Low Carbon Steel ◽  
Amorphous Powder ◽  
Nominal Composition ◽  
Low Carbon ◽  
Hardness Tester ◽  
Metallurgical Bonding ◽  
Intrinsic Mechanism ◽  
Increasing Trend

The Fe-based amorphous composite coatings were prepared by pulse laser cladding method. The amorphous powder with the size ranging from 100 to 200 meshes was cladded on the low carbon steel plate,and the nominal composition of the powder was (wt.%) Cr:14.95, Mo:25.7, B:1.24, C:3.45, Y:3.40, Fe:51.29. The microstructure, phase composition and hardness were characterized by XRD, SEM, DSC and semi-automatic Vickers hardness tester in this study, respectively. The results show that the coating which is composed of amorphous and nanocrystal phases has the dense structure and metallurgical bonding with the substrate. The hardness of coatings was about 5 times higher than that of the substrate. With the increase of cladding layer, the average hardness of coating showed an increasing trend, and the intrinsic mechanism was discussed.

scholarly journals High Temperature Tribological Behavior of Borocarburized Layer on Q235 Steel

2021 ◽  
Vol 27 (1) ◽  
pp. 42-49
Author(s):  
Zhengang YANG ◽  
Wenping LIANG ◽  
Yanlin JIA ◽  
Qiang MIAO ◽  
Zheng DING ◽  
...  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Carbon Steel ◽  
Wear Mechanism ◽  
Adhesive Wear ◽  
Low Carbon Steel ◽  
Boride Layer ◽  
Low Carbon ◽  
Fatigue Wear ◽  
Carburized Layer

A borocarburized layer was successfully fabricated on the surface of Q235 low-carbon steel via double glow treatment to improve the wear resistance at elevated temperature. The phase composition and microstructure of borocarburized layer were investigated by XRD and SEM. The microhardness of borocarburized layer from the surface to the substrate were detected. And the tribological behaviors of borocarburized layer and substrate were investigated under the dry-sliding against ZrO2 ball at three temperatures. The results indicate that the borocarburized layer consists of an outermost boride layer and a transition layer of carburized layer. The boride layer with main phase of Fe2B has a high hardness around 1700 HV, and the hardness of transition layer with main phase of Fe5C3 is around 600 HV. The novel gradient structure of an outermost boride layer and inner carburized layer is design in this research decreases the hardness mismatch of coating to prevent the boride layer peeling off. The friction coefficient and specific wear rate of borocarburized layer are much lower than that of substrate at the same temperature. In addition, the wear mechanism of substrate is mainly fatigue wear and slightly adhesive wear at 20℃. When the wear test performs at 200℃, the substrate wear mechanism is adhesive wear and fatigue wear. The wear mechanism of borocarburized layer is main abrasive wear at 20℃ and 200℃. And the wear mechanism of both substrate and borocarburized layer are main oxidation wear and adhesive wear at 500℃. The borocarburized layer effectively improves the wear resistance of low carbon steel due to the higher hardness and great thermal stability at high temperature.

scholarly journals Revealing the Unexpected Two Variant Pairing Shifts Due to Temperature Change in a Single Bainitic Medium Carbon Steel

2021 ◽  
Author(s):  
Adam Ståhlkrantz ◽  
Peter Hedström ◽  
Niklas Sarius ◽  
Annika Borgenstam
Keyword(s):  
Carbon Steel ◽  
Electron Backscatter Diffraction ◽  
Low Carbon Steel ◽  
Medium Carbon Steel ◽  
Low Carbon ◽  
Medium Carbon ◽  
Strong Relation ◽  
Upper Bainite ◽  
The Common ◽  
Backscatter Diffraction

AbstractThe microstructure of a low alloy medium carbon bainitic steel, austempered in the temperature range 275 °C to 450 °C has been investigated by detailed electron backscatter diffraction and variant pairing analysis. It is observed that the variant pairing tendency has two distinct changes with varying temperature. At low temperature V1-V6 is the most frequent, whereas V1-V2 is the most frequent at intermediate temperature and at the highest temperature, V1-V4 dominates. This is distinct from the literature on low carbon steel where only two dominant variants pairs, related to the common distinction of bainite into lower and upper bainite, are typically reported. The change of the variant pairing in bainite also has many similarities with the change of variant pairing in martensite when its carbon content changes. Another observation is that the morphological orientation of cementite in the bainite has a strong relation with the variant pairing at lower austempering temperatures.

Microstructure and Properties of Fe Base Coatings Reinforced by In Situ TiC Particles Using Plasma Jet Surface Metallurgy

2016 ◽  
Vol 849 ◽  
pp. 677-682
Author(s):  
Hao Chen ◽  
Yang Rong Zhang ◽  
Zhu Huang
Keyword(s):  
Carbon Steel ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Low Carbon Steel ◽  
Plasma Jet ◽  
Low Carbon ◽  
Dispersion Strengthening ◽  
Micro Hardness ◽  
X Ray

By plasma jet surface metallurgy, the thick composite coatings reinforced by in-situ TiC were produced on low carbon steel. Composition, microstructures and performance were characterized by scanning electron microscope (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), micro-hardness tester and wear tester. The results showed that the excellent bonding between the coating and the carbon steel substrate was achieved by strong metallurgical interface. The microstructure of the coating is mainly composed of γ-(Fe, Ni) dendrite, M23C6, CrB and in-situ synthesized TiC ceramic particle. Because of the particulate reinforcement, the dispersion strengthening, refinement strengthening, micro-hardness and wear resistant of Fe-based coating can be enhanced.

scholarly journals Observation of Chemical State for Interstitial Solid Solution of Carbon in Low-carbon Steel by Soft X-ray Absorption Spectroscopy

2020 ◽  
Vol 60 (1) ◽  
pp. 114-119 ◽  
Author(s):  
Kakeru Ninomiya ◽  
Kazutaka Kamitani ◽  
Yusuke Tamenori ◽  
Kazuki Tsuruta ◽  
Toshihiro Okajima ◽  
...  
Keyword(s):  
Solid Solution ◽  
Carbon Steel ◽  
Absorption Spectroscopy ◽  
Low Carbon Steel ◽  
Chemical State ◽  
Low Carbon ◽  
Interstitial Solid Solution ◽  
X Ray ◽  
X Ray Absorption
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