Evaluation Hard Layers in Steel AISI 8620

2013 ◽  
Vol 690-693 ◽  
pp. 2055-2058 ◽  
Author(s):  
N. Lopez-Perrusquia ◽  
M. A. Doñu-Ruiz ◽  
Victor Cortes Suarez ◽  
D. Sánchez-Huitron ◽  
E.Y. Vargas-Oliva ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Diffraction Analysis ◽  
Energy Dispersive Spectroscopy ◽  
Crack Model ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
X Ray ◽  
Borided Layer ◽  
Steel Aisi ◽  
Palmqvist Crack

In the present study, identify the fracture toughness and strength adhesion of borided layers in Steel AISI 8620 by boriding dehydrated paste. The formation of the borided at a temperature range of 1173, 1223 and 1273 K for 4, 6 and 8 h. X-ray diffraction analysis revealed peak of FeB, Fe2B, MoB and CrB and The distribution of alloying elements was detected by means of energy dispersive Spectroscopy (EDS), the Fracture toughness of the layers is estimated at 15 and 30 um from surface using different loads indentation Vickers, using Palmqvist crack model, the adherence of the layer/substrate was evaluate in qualitative form though the Rockwell C. The fracture toughness of the borides depends strongly on temperature and time boriding. Also, good adhesion is obtained around the Rockwell C indentation prints on the borided layer-substrate-interface.

Formation of Hard Layers in Tool Steels

2013 ◽  
Vol 690-693 ◽  
pp. 2059-2062 ◽  
Author(s):  
N. Lopez-Perrusquia ◽  
M. A. Doñu-Ruiz ◽  
S. Rodríguez-González ◽  
D. L. Rosado Cruz ◽  
Frumencio Vasquez-Ramírez
Keyword(s):  
Fracture Toughness ◽  
Crack Model ◽  
Tool Steels ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
X Ray ◽  
Aisi 4140 ◽  
Steel Aisi ◽  
Boriding Process ◽  
Palmqvist Crack

In the present study, identify the fracture toughness and strength adhesion of borided layers on grade tools steels by Boronizing, two commonly used steel AISI 4140 and AISI 9840 are considered, the steels contain 1.0 - 0.8 wt% Cr and 0.20 - 0.25 wt% Mo, respectively. The formation of the borided layers was carried out by the powder pack boriding process at a temperature range of 1273 K for 4, 6 and 8 h. X-ray diffraction analysis revealed peak of FeB, Fe2B and CrB, the Fracture toughness of the layers is estimated at 15 and 30 um from surface using four different Vickers indentation loads, using Palmqvist crack model, the adherence of the layer/substrate was evaluate in qualitative form though the Rockwell C. The fracture toughness of the borides depends strongly on temperature and time bronzing. Also, good adhesion is obtained around the Rockwell C indentation prints on the borided layer-substrate-interface.

Characterization and Fracture Toughness on AISI 8620 with Hard Coatings

2016 ◽  
Vol 369 ◽  
pp. 89-94
Author(s):  
M.A. Doñu Ruiz ◽  
N. López Perrusquia ◽  
D. Sanchez Huerta ◽  
C.R. Torres San Miguel ◽  
V.J. Cortés Suárez
Keyword(s):  
Fracture Toughness ◽  
Experimental Parameter ◽  
Hard Coatings ◽  
Crack Model ◽  
X Ray Diffraction ◽  
Tree Model ◽  
X Ray ◽  
Metallographic Technique ◽  
Palmqvist Crack ◽  
Scanning Electron

The present studies characterize and evaluate the fracture toughness at the surface AISI 8620 with hard coating. The hard coatings FeB and Fe2B were formed using the boriding dehydrated paste at temperatures 1223 and 1273 K with 6 and 8 h exposure time, respectively. The presence of hard coatings formed on the surface AISI 8620 were confirmed by the classical metallographic technique combined with X-ray diffraction analysis. The distribution of alloying elements was determined by Energy Dispersive Spectroscopy (EDS). The fracture toughness of the hard coatings on AISI 8620 was estimated using a Vicker microindentation induced fracture testing of 15 and 35 μm from the surface, applying four load (0.49, 0.98,1.96 and N). The microcrack generated at the corner of the microindentation was considered as an experimental parameter and the tree model Palmqvist crack model was employed to determine the fracture toughness. The adherence of the hard coatings/substrate was evaluate in qualitative form though the VDI 3198 by testing Rockwell C and observed by Scanning Electron Microscopy (SEM). The formation of hard layers was obtained in the range of 100-130 μm, results of XRD present phases FeB, Fe2B, CrB and MnB, the values obtained of Kc are in the range of 2.3 to 4.1 MPam1⁄2 and results of acceptable adhesion HF4 patterns for conditions 6 h of treatment

scholarly journals EFECTS OF CHEMICAL COMPOSITION ON THE MICROSTRUCTURE AND PROPERTIES OF THE CU-Ge-Sb ALLOYS

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Dejan Gurešić ◽  
Aleksandar Đorđević ◽  
Aleksandar Marković ◽  
Milica Tomović ◽  
Nadežda Talijan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Scanning Electron Microscopy ◽  
Chemical Composition ◽  
Diffraction Analysis ◽  
Eddy Current ◽  
Energy Dispersive Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In the current study a ternary Cu-Ge-Sb system has been experimentally assessed. Chemical andphase compositions of the alloy samples from three vertical sections Cu-GeSb, Ge-CuSb and Sb-CuGe were studied using scanning electron microscopy (SEM) and energy dispersive spectroscopy(EDS) and confirmed by X-ray diffraction analysis (XRD). Hardness of the alloys was measured byBrinell method while hardness of phases was measured using micro Vickers method. Electricalconductivity of the studied alloys was measured using eddy current instrument. Based onexperimentally determined values iso-lines of hardness and electrical conductivity for the wholeternary system were calculated using assumed mathematical models.

Synthesis and characterization of TiN / Ti / AISI 410 coatings

2018 ◽  
Vol 2 (1) ◽  
pp. 7
Author(s):  
S Chirino ◽  
Jaime Diaz ◽  
N Monteblanco ◽  
E Valderrama
Keyword(s):  
Synthesis And Characterization ◽  
Photoemission Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Columnar Grains ◽  
Tin Thin Films ◽  
Steel Aisi ◽  
Interacting Surfaces ◽  
Stainless Steel Aisi

The synthesis and characterization of Ti and TiN thin films of different thicknesses was carried out on a martensitic stainless steel AISI 410 substrate used for tool manufacturing. The mechanical parameters between the interacting surfaces such as thickness, adhesion and hardness were measured. By means of the scanning electron microscope (SEM) the superficial morphology of the Ti/TiN interface was observed, finding that the growth was of columnar grains and by means of EDAX the existence of titanium was verified.  Using X-ray diffraction (XRD) it was possible to observe the presence of residual stresses (~ -3.1 GPa) due to the different crystalline phases in the coating. Under X-ray photoemission spectroscopy (XPS) it was possible to observe the molecular chemical composition of the coating surface, being Ti-N, Ti-N-O and Ti-O the predominant ones.

Ten-Vertex Polyhedral Monocarbaborane Chemistry. The Novel High-Yield Formation of the Ten-Vertex closo Compound [6-(PMe2Ph)-closo-1-CB9H9] from the Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11]

1993 ◽  
Vol 58 (12) ◽  
pp. 2924-2935 ◽  
Author(s):  
Jane H. Jones ◽  
Bohumil Štíbr ◽  
John D. Kennedy ◽  
Mark Thornton-Pett
Keyword(s):  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
High Yield ◽  
Monoclinic Space Group ◽  
The Novel ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
X Ray ◽  
Yield Formation ◽  
Boiling Toluene

Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11] in boiling toluene solution results in an elimination of the platinum centre and cluster closure to give the ten-vertex closo species [6-(PMe2Ph)-closo-1-CB9H9] in 85% yield as a colourles air stable solid. The product is characterized by NMR spectroscopy and single-crystal X-ray diffraction analysis. Crystals (from hexane-dichloromethane) are monoclinic, space group P21/c, with a = 903.20(9), b = 1 481.86(11), c = 2 320.0(2) pm, β = 97.860(7)° and Z = 8, and the structure has been refined to R(Rw) = 0.045(0.051) for 3 281 observed reflections with Fo > 2.0σ(Fo). The clean high-yield elimination of a metal centre from a polyhedral metallaborane or metallaheteroborane species is very rare.

Bis(μ-carboxylato)dienerhodium(I) Complexes - Synthesis, Characterization and Catalytic Activity

2008 ◽  
Vol 73 (8-9) ◽  
pp. 1205-1221 ◽  
Author(s):  
Jiří Zedník ◽  
Jan Sedláček ◽  
Jan Svoboda ◽  
Jiří Vohlídal ◽  
Dmitrij Bondarev ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffraction Analysis ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray

Dinuclear rhodium(I) η2:η2-cycloocta-1,5-diene (series a) and η2:η2-norborna-2,5-diene (series b) complexes with μ-RCOO- ligands, where R is linear C21H43 (complexes 1a, 1b), CH2CMe3 (2a, 2b), 1-adamantyl (3a, 3b) and benzyl (4a, 4b), have been prepared and characterized by spectroscopic methods. Structures of complexes 2b, 3a and 4a were determined by X-ray diffraction analysis. Complexes prepared show low to moderate catalytic activity in polymerization of phenylacetylene in THF giving high-cis-transoid polymers, but they show only oligomerization activity in dichloromethane.

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