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Experimental study on microstructural and corrosion behaviors of friction stir processed steel with CoCrFeCuTi HEA reinforcement and effect of annealing

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Science China Technological Sciences 2025年第1期 233-250页

作者： S.Aravind KRISHnA n.RADHIKA Alokesh PRAMAnIK n.jeyaprakash Department of Mechanical Engineering Amrita School of EngineeringAmrita Vishwa Vidyapeetham School of Civil and Mechanical Engineering Curtin University School of Mechanical and Electrical Engineering China University of Mining and Technology

The ability to perform against extreme corrosion environments in stainless steel depreciates under challenging conditions in industrial applications. This can be resolved by employing surface modification techniques to modify the surface with the required characteristics. The present study investigates the outcomes of friction stir processing of SS304 with CoCrFeCuTi high entropy alloy(HEA) as reinforcement and the property enhancements post-annealing. The synthesized CoCrFeCuTi HEA exhibited irregular fragments with 17 μm mean particle size and body centred cubic(BCC) phase. The microstructure of the processed surface revealed ultra-refined grains with a uniform distribution of HEA filler. The microstructures of the samples annealed at 400℃, 550℃, 700℃ and 850℃ for 2 h also showed significant grain growth and grain refinements. The processed sample with HEA reinforcement annealed at 700℃ exhibited enhanced microhardness and tensile strength by 63% and 0.88 times than that of the processed sample with HEA pre-annealing. The subsequent electrochemical corrosion test displayed better corrosion resistance for the HEA-processed and annealed sample. Hot corrosion tests at 900℃ showcased excellent resistance for the HEA processed and annealed samples by 14.92%, 12.75%, and 14.83% against the samples pre-annealed under three different salt mixtures, and the corroded surface was analyzed.

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Comparison of microstructure, mechanical and wear behaviour of laser cladded stainless steel 410 substrate using stainless steel 420 and Colmonoy 5 particles

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Journal of Iron and Steel Research International 2020年第12期27卷 1446-1455页

作者： n.jeyaprakash Che-hua Yang KRRamkumar Guang-zhou Sui Additive Manufacturing Center for Mass CustomizationProduction National Taipei University of TechnologyTaipei 10608TaiwanChina Institute of Manufacturing Technology National TaipeiUniversity of TechnologyTaipei 10608TaiwanChina Department of Metallurgical and Materials Engineering Indian Institute of Technology MadrasChennai 600036India Graduate Institute of Mechanical and Electrical Engineering National Taipei University of TechnologyTaipei 10608TaiwanChina

Stainless steel (SS) 410 is widely used in many components of nuclear reactors due to its good corrosion resistance and high strength. However, wear is a major issue of these components due to its continuous sliding. SS 420 and Colmonoy 5 particles were deposited over SS 410 substrate by laser cladding process. Then, X-ray diffraction was used to find the phases present after cladding process. Further, coating morphologies were analysed by scanning electron microscopy (SEM) twinned with energy-dispersive spectroscopy. The obtained morphology indicates the hard laves phase present in the Colmonoy 5 cladding surface and needle-like structure in SS 420 cladding surface. Then, Vickers microhardness test was carried out in order to study the hardness and load-carrying capacity of the cladding specimen. Among those, Colmonoy 5 cladding specimen provide higher hardness due to the presence of laves phase formation. Then, the dry sliding wear study was conducted to calculate the mass loss after 2500 m of sliding. The combined effect of hardness and laves phase formation were reflected in dry sliding wear study analysis of the specimens. Then, to study the wear mechanism and roughness, worn surface morphologies were captured using SEM and white light interferometer, respectively.

关键词： Stainless steel(SS)410 Stainless steel(SS)420 Colmonoy 5 Laser cladding Laves phase Wear behaviour Mechanism Roughness

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Optimization of tribological parameters over WC-12%Co laser alloyedpearlitic ductile iron using Taguchi based Grey relational analysis

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Journal of Central South University 2020年第3期27卷 736-751页

作者： n.jeyaprakash YAnG Che-hua TSEnG Sheng-po Centre of Mass Customization Additive Manufacture National Taipei University of TechnologyTaiwanChina Institute of Manufacturing Technology National Taipei University of TechnologyTaiwanChina

Pearlitic ductile irons(PDIs)are used in transportation and nuclear energy *** heavy loading situation,the service life of PDI is affected by numerous tribo *** this study,surface of the PDI is alloyed with WC-12%Co powder using a high power fibre *** wear properties of the base material and laser alloying samples were investigated by tribometer with various parameters,i.e.,temperature,load and sliding *** on experimental test,the load has maximum percentage of contribution and followed by sliding speed and working *** optimized tribological parameters by Grey relational analysis(GRA)were established and those values are closely matched with predicted ***,base material and laser alloying surfaces were examined through Vickers hardness machine,scanning electron microscopy(SEM)and roughness *** laser altered specimen shows no defects and improves the wear properties than *** identified optimal tribological parameters are load of 30 n,speed of 0.5 m/s and working temperature of 300℃,and load of 30 n,speed of 0.5 m/s and working temperature of 200℃ for base metal and laser alloying samples,respectively.

关键词： WC-12%Co laser alloying microstructure wear resistance Grey technique analysis of variance optimization roughness

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