Laser clad WC reinforced Ni-based intermetallic-matrix composites to improve cavitation erosion resistance Surface melting of Al-Cu-Mg alloy using a short-pulse, planar waveguide CO 2 laser for corrosion resistance improvement J. Laser Appl. 15, 233 (2003); 10.2351/1.1620005Laser cladding of cast aluminum-silicon alloys for improved dry sliding wear resistanceThe interest of high speed steel ͑HSS͒ for wood cutting tools remains very important because of their good tool edge accuracy and easy grinding. The main problem is their low resistance to both mechanical and chemical wearing. Resistance of HSS cutting tools to wearing is a primary concern in the applicability of the HSS cutting tools to a wood cutting operation. In order to increase their performance, a laser melting and cladding applied on the tool edges is presented in this paper. First, the annealed AISI M2 bar was melted, and the M2 powder was cladded onto the AISI L2 substrate by a laser beam. The microstructure and microhardness of the M2-clad and M2-melted were characterized. Second, their wear resistance was tested for cutting wood. The experimental results showed that the microstructures on the clad zone ͑CZ͒ of M2-clad and melted zone ͑MZ͒ of the M2-melted reveal fine and homogeneous iron dendritic structure, in which whole primary carbides were completely dissolved during laser cladding and melting. The energy dispersive spectroscopy ͑EDS͒ analysis indicated that the M2-clad reveals CZ microstructure with more uniform distribution of fine carbides compared to MZ microstructure. The M2-clad and M2-melted, which present almost the same microhardness, have larger microhardness compared to the M2-conventional. The results of wearing tests showed that the M2-clad and M2-melted cutting tools are better in wear resistance, edge roughness, and suffer less edge fractures than the M2-conventional peeling tool. Laser melting and cladding are considered to be valuable techniques to improve the performance of the M2 high speed steel cutting tools for wood machining application.
Penggunaan kayu mersawa dan papan partikel sebagai material konstruksi bangunan dan tujuan dekoratif terus mengalami peningkatan. Penelitian sebelumnya menjelaskan bahwa material tersebut menghasilkan laju aus yang tinggi yang disebabkan oleh kandungan silika dan resin. Artikel ini menjelaskan karakteristik aus mata pisau yang telah dilapisi bahan pengeras baru pada pemotongan kayu mersawa dan papan partikel. Kayu mersawa dan papan partikel dengan kerapatan 0,8 dan 0,61 g/cm 3 dipotong menggunakan mata pisau tungsten carbide K10 yang telah dilapisi dengan lapisan tunggal titanium aluminium nitrid (TiAlN), multi-lapis TiAlN/titanium silikon nitrid (TiSiN), dan multi-lapis TiAlN/titanium boron nitrid (TiBN). Uji pemotongan menggunakan computer numeric control router pada kecepatan potong 17 m/s dengan laju pengumpanan sebesar 0,1 mm/rev untuk melihat karakteristik aus pada sisi clearance mata pisau. Hasil penelitian menunjukkan bahwa mata pisau yang telah dilapisi menghasilkan aus yang lebih rendah dibandingkan dengan mata pisau tanpa pelapis pada pemotongan kayu mersawa dan papan partikel. Lapisan multi-lapis TiAlN/TiBN pada penelitian ini menghasilkan daya tahan aus yang paling tinggi. Kekerasan yang tinggi, koefisien friksi yang rendah, daya tahan oksidasi yang tinggi, dan ketahanan terhadap delaminasi yang tinggi pada lapisan multi-lapis TiAlN/TiBN menunjukkan bahwa lapisan ini sangat cocok diaplikasikan pada pemotongan kayu abrasif (kandungan silika tinggi) dan kayu komposit pada kecepatan potong yang tinggi.
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