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Influence of Treatment Sequence on Tribological Performance of Duplex Surface-Treated AISI 1045 Steel

Acta Metallurgica Sinica(English Letters) 2019年第10期32卷 1227-1236页

作者： Farahnaz Haftlang ali habibolahzadeh School of Metallurgy and Materials Engineering College of Engineering University of Tehran Tehran Iran Department of Metallurgy and Materials Engineering Faculty of Engineering Semnan University Semnan Iran

The surface of AISI 1045 steel specimens was modified via two duplex surface treatments of (i) titanium diffusion coating followed by plasma nitriding (Ti-PN) and (ii) plasma nitriding followed by titanium diffusion coating (PN-Ti). A comparative study on the microstructure and wear properties of the fabricated TiN coatings was conducted. A scanning electron microscope equipped with energy-dispersive X-ray spectroscopy, X-ray diffractometer (XRD), and pin-on-disk wear test was utilized to evaluate the microstructures, phases, and wear properties of the coatings. XRD patterns of duplex-treated specimens illustrated that the modified layer consisted of nitride and carbo-nitride phases such as TiN and TiC0 7N0 3. The results also showed that Ti-PN treatment led to a low friction coefficient and the lowest wear factors, as compared with the PN-Ti treatment. Oxidation and mild fatigue fracture wear were found to be the main wear mechanism of the Ti-PN coating. The wear mechanism in the PN-Ti specimen involved a higher oxidative wear regime followed by plastic deformation wear regimes.

关键词： Duplex surface treatment TiN coating Plasma nitriding Titanium diffusion coating Tribological performance

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Improving pulsed laser weldability of duplex stainless steel to 5456 aluminum alloy via friction stir process reinforcing of aluminum by BNi-2 brazing alloy

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Transactions of Nonferrous Metals Society of China 2019年第7期29卷 1401-1412页

作者： Hossein ESMAILY ali habibolahzadeh Mohammad TAJALLY Faculty of Materials and Metallurgical Engineering Semnan University

Effects of laser pulse distance and reinforcing of 5456 aluminum alloy were investigated on laser weldability of Al alloy to duplex stainless steel (DSS) plates. The aluminum alloy plate was reinforced by nickel-base BNi-2 brazing powder via friction stir processing. The DSS plates were laser welded to the Al5456/BNi-2 composite and also to the Al5456 alloy plates. The welding zones were studied by scanning electron microscopy, X-ray diffractometry, micro-hardness and shear tests. The weld interface layer became thinner from 23 to 5 μm, as the laser pulse distance was increased from 0.2 to 0.5 mm. Reinforcing of the Al alloy modified the phases at interface layer from Al-Fe intermetallic compounds (IMCs) in the DSS/Al alloy weld, to Al-Ni-Fe IMCs in the DSS/Al composite one, since more nickel was injected in the weld pool by BNi-2 reinforcements. This led to a remarkable reduction in crack tendency of the welds and decreased the hardness of the interface layer from ~950 HV to ~600 HV. Shear strengths of the DSS/Al composite welds were significantly increased by ~150%, from 46 to 114 MPa, in comparison to the DSS/Al alloy ones.

关键词： duplex stainless steel (DSS) Al5456 aluminum alloy BNi-2 brazing alloy friction stir processing pulsed laser welding

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