Influence of discharge time on properties of plasma electrolytic borocarburized layers on Q235 low-carbon steel

Wang, Bin; Wang, Xue; Wu, Zhenglong; Jin, Xiaoyue; Wu, Jie; Du, Jiancheng

doi:10.1016/j.matchemphys.2015.08.045

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…Especially, the working environments related to wear, corrosion, high-temperature oxidation, etc. can bring into the severe failure behaviors of the Q235 steels, which can lead to the terrible challenge in security of the working systems [2,3]. Therefore, the effective and protective coatings are in great request for enhancing the working properties of the Q235 steels.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Property Evaluation of the Al2O3-TiO2 Composite Coatings Prepared by Plasma Spray

et al. 2020

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The Al2O3-13 wt.% TiO2 (AT13) composite coatings were prepared on Q235 steel by plasma spray technique. The spray parameters were designed by the orthogonal experiments, and the properties of the coating were evaluated. Results showed that with respect to the bond strength of the coating, the optimized spraying parameters were the plasma current of 530 A, Ar flow of 41 L/min, H2 flow of 10 L/min, and spray standoff distance of 100 mm. The plasma spray process led to the transition of α-Al2O3 to γ-Al2O3, resulting in the increase in the porosity of AT13 coating prepared at nonoptimized parameters. Meanwhile, the porosity and cracks were also increased due to the decrease in the Ar flow and the increase in spray standoff distance. The low porosity, a few cracks, and the uniformly dispersed TiO2 particles contributed the enhanced properties including mechanical and corrosion behaviors of the AT13 coating prepared at optimized parameters. The bond strength, microhardness, and thermal shock resistance of the AT13 coating could reach 25.01 MPa, 1000.6 HV0.5, and 40 times when the coating was prepared at optimized parameters, respectively. Especially, the static Icorr of the AT13 coating prepared at optimized parameters was two order of magnitude less than that of Q235 steel. In addition, the erosion weight loss of Q235 steel could be decreased about 30 times by the protection of the AT13 coating.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Property Evaluation of the Al2O3-TiO2 Composite Coatings Prepared by Plasma Spray

et al. 2020

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“…Only the Fe 3 O 4 oxide appears additionally in the loose top layer. In the paper [37], the Fe 2 B phase was identified additionally in the loose top layer after cathode plasma electrolytic borocarburizing of low-carbon steel. Whereas the composition of the boride layer was still the same (Fe 2 B).…”

Section: Introductionmentioning

confidence: 99%

Gas Technique of Simultaneous Borocarburizing of Armco Iron Using Trimethyl Borate

2020

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The gas boriding process is an appropriate technique used for increasing the hardness and wear resistance of iron and steels. However, the boron halides (e.g., BCl3, BF3) are rarely used as a boron source during gas boriding in industry due to the toxic character of these reagents. The possibility of the use of organic compounds as a boron source in plasma assisted processes was the instigation to determine the possibility of applying these agents for gas boriding. In the present work trimethyl borate was used as an organic boron source. The use of a N2–H2–B(CH3O)3 atmosphere ensured the appropriate conditions for the simultaneous gas borocarburizing of Armco iron. The process was carried out at 1223 K (950 °C) for 2 h. The produced layer consisted of two zones: an outer zone containing a diffusion of boron atoms and an inner zone containing a diffusion of carbon atoms, under the outer zone. Due to the reduction of trimethyl borate with hydrogen, free atoms of carbon were released for the gas atmosphere. Therefore, there existed favorable conditions for carburizing. Unfortunately, the formation of a carburized layer was the reason for the difficult diffusion of boron atoms. As a consequence, the boron diffusion front was hindered, and the outer boride layer was relatively thin (ca. 7.8 µm). The boride layer contained only Fe2B phase, which was characterized by high hardness in the range from 1103 HV0.01 to 1546 HV0.01. The presence of iron borides in the outer layer was also the reason for increased wear resistance in comparison with untreated Armco iron.

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Trends in Physical Techniques of Boriding

Kulka

2018

Engineering Materials

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Influence of discharge time on properties of plasma electrolytic borocarburized layers on Q235 low-carbon steel

Cited by 9 publications

References 27 publications

Fabrication and Property Evaluation of the Al2O3-TiO2 Composite Coatings Prepared by Plasma Spray

Fabrication and Property Evaluation of the Al2O3-TiO2 Composite Coatings Prepared by Plasma Spray

Gas Technique of Simultaneous Borocarburizing of Armco Iron Using Trimethyl Borate

Trends in Physical Techniques of Boriding

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