The paper presents the possibility to apply the Finite Element Method for evaluation of stresses in the Ti+TiN, Ti+Ti(CxN1-x), Ti+TiC coatings obtained in the magnetron PVD process on the sintered high-speed steel of ...
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ISBN:
(纸本)0871708434
The paper presents the possibility to apply the Finite Element Method for evaluation of stresses in the Ti+TiN, Ti+Ti(CxN1-x), Ti+TiC coatings obtained in the magnetron PVD process on the sintered high-speed steel of the ASP 30 type, taking into account their deposition conditions. Defined model of the tool coated with the coatings in the PVD process was verified by comparison with the results of computer simulation of stresses with the experimental results. computer simulation of stresses was carried out in ANSYS environment, using the FEM method and the experimental values of stresses were determined basing on the X-ray diffraction patterns.
The following review paper is a synopsis of the fundamentals of laser remelting and alloying, outlining some of its benefits compared with conventional heat treatment techniques of hot-work tool steel X40CrMoV5-1. A s...
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ISBN:
(纸本)0912035846
The following review paper is a synopsis of the fundamentals of laser remelting and alloying, outlining some of its benefits compared with conventional heat treatment techniques of hot-work tool steel X40CrMoV5-1. A selective review of the experimental research carried out in this area is presented. The aim of such treatment was to harden and alloy the steel surface which had been previously coated with the paste consisting of the tungsten carbide and the inorganic binder. Development of the surface layer was observed in which one can distinguish the remelted zone, heat-affected zone and the transient zone. Occurrences of the un-melted tungsten carbide grains were observed in the structure and the increased tungsten content compared to the native material, whose variable concentration is connected with the molten metal fluctuation in the pool during alloying. The fine grained, dendritic structure occurs in the remelted and alloyed zone with the crystallization direction connected with the dynamical heat abstraction from the laser beam influence zone. It has the important cognitive significance and gives grounds to the practical employment of these technologies for forming the surfaces of new tools and regeneration of the used ones.
This study presents the results of microstructural examinations, mechanical tests and service performance tests carried out on thin TiN/(Ti,Al,Si)N/TiN wear resistance coatings obtained by the CAE process on cermet an...
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This study presents the results of microstructural examinations, mechanical tests and service performance tests carried out on thin TiN/(Ti,Al,Si)N/TiN wear resistance coatings obtained by the CAE process on cermet and cemented carbide substrates. Microstructural examinations of the applied coatings and the substrate were made with an OPTON DSM 940 SEM and a LEICA MEF4A light microscope. Adhesion of the coatings on cemented carbides and cermets was measured using the scratch test. The cutting properties of the materials were determined from service tests in which continuous machining of C45E steel was carried out. The hardness of the substrate and the microhardness of the coatings were determined with a DUH 202 SHIMADZU ultra microhardness tester with a load of 70 mN. Roughness tests were also carried out before applying the coatings and after the PVD process. Cutting tests confirmed the advantages of the TiN/(Ti,Al,Si)N/TiN type coatings obtained using the PVD method in the CAE mode on cemented carbides and cermets, as a material that undergoes very low abrasive, thermal and adhesion wear. These coatings extend tool life compared to commercially available uncoated tools with single and multi-layer coatings deposited using PVD/CVD methods.
The paper deals with mechanical and microstructural characteristics of Ni-Mo and Ni-Mo-W (with increasing quantities of tungsten, from 0 to 0,3% wt.) sintered steel. The effect of chemical composition and of the appli...
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ISBN:
(纸本)9781899072187
The paper deals with mechanical and microstructural characteristics of Ni-Mo and Ni-Mo-W (with increasing quantities of tungsten, from 0 to 0,3% wt.) sintered steel. The effect of chemical composition and of the applied vacuum sintering (plus rapid cooling) are investigated in terms of mechanical properties, focusing, in particular, on the wear properties. Microstructure observations are performed using LOM and SEM, the latter being used, together with EDS, for phase distribution and mapping.
作者：
L.A DobrzańskiM AdamiakA ZarychtaSilesian Technical University
Institute of Engineering Materials and Biomaterials Division of Materials Processing Technology and Computer Techniques in Materials Science Kanarskiego St. 18 a 44-100 Gliwice Poland
This paper presents the results of investigations regarding the phase transformations occurring during the heat treatment of W-Mo-V + Si + Nb high-speed steels. It was found that investigat...
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This paper presents the results of investigations regarding the phase transformations occurring during the heat treatment of W-Mo-V + Si + Nb high-speed steels. It was found that investigated steels demonstrate their maximum secondary hardness, about 66 HRC, in connection with the precipitation of M 4 C 3 carbides in tempered martensite after austenitizing at 1240°C and tempering at 540–570°C. The paper presents also results of investigations regarding the erosion resistance of TiN and Ti(C,N) PVD coatings deposited on the investigated steels. TiN and Ti(C,N) coatings deposited in the PVD process yield, respectively, three and seven times greater erosion resistance of the steel surface and demonstrate good adhesion to the investigated steels forming the substrate. Quantitative metallography methods as well as mass loss and created craters 3-D measurements were employed to evaluate the erosion resistance of the investigated coatings. It was found that the surface topography influences the erosion resistance of PVD vacuum arc method coatings. The investigated coatings are not affected by the type of the substrate high-speed steels.
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