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DEPOSITION OF TiBN hard filmS ON HOT-WORKING-STEEL DIES FOR ALUMINIUM EXTRUSION VIA A DUPLEX PROCESS

Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 408-414页

作者： K. Muller (Forschungszentrum Stranpressen, TU Berlin, 13355 Berlin, Germany) Forschungszentrum Stranpressen TIJ Berlin

Hot working steels have been used as die materials for hot extrusion of aluminium. Due to tribological interaction at elevated temperature between the die bearing and the surface of extruded aluminium profiles, not only the surface quality of the extruded product, but also the lifetime of the dies decreases. Deposition of TiBN hard films on the die bearing could improve the die performance. Treatment should be done in a duplex process process combining a plasma nitriding pretreatment (PN) and a plasma assisted chemical vapour deposition (PACVD) of TiBN. In this study the influence of the process conditions on the properties of the duplex coatings was investigated. The relationship between structure and mechanical property was researched. For testing these TIBN hard films under elevated temperature conditions and for comparison with other possible coatings special extrusion dies with different coated bearings were used. The extrusion trials were performed on the 8MN-extrusion press at the research a nd development center for extrusion, Technical University of Berlin.

关键词： hard film plasma nitriding duplex process PN PA CVD and extrusion

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Stress distribution variations during nanoindentation failure of hard coatings on silicon substrates

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Nanotechnology and Precision Engineering 2023年第4期6卷 1-10页

作者： Ritambhara Dash Kushal Bhattacharyya Arnab S.Bhattacharyya Department of Metallurgical and Materials Engineering Central University of JharkhandRanchi 835205India Department of Mechanical Engineering Netaji Subhash Engineering CollegeKolkata 700152India Centre of Excellence in Green and Efficient Energy Technology(CoE GEET) Central University of JharkhandRanchi 835205India

Regarding quality inspection of technologically important nanocomposite hard coatings based on Ti,B,Si,C,and N and bioceramics such as hydroxyapatite that are used in small-scale high-precision devices and bio-implants,it is essential to study the failure mechanisms associated with nanoindentation,such as fracture,delamination,and *** stress imposed by the indenter can affect the fracture morphology and the interfacial fracture energy,depending on indenter shape,substrate type,crystallographic properties,pre-existing flaws,internal microcracks,and *** here are finite-element-based fracture studies that provide insights into the different cracking mechanisms related to the aforementioned failure process,showing that the fracture morphology is affected by the interaction of different cracking *** interfacial fracture energy,toughness,and residual stress are calculated using existing models with minor adjustments,and it is found that increasing the indenter sharpness improves the shear stress distribution,making the coating more prone to *** on the prevailing type of stress,the stress distribution beneath the depression results in either crack formation or a dislocation pile-up leading to strain *** forms of resistances resulting from the indentation process are found to affect the tip–sample conduction,and because of its stronger induced plasticity than that of a Berkovich indenter tip,a sharper cube-corner tip produces more resistance.

关键词： Nanoindentation hard film Finite-element analysis(FEA) Cracking mechanism Stress

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