共搜索到794条信息,每页显示10条信息,共80页。用时:0小时0分0秒718毫秒
through many researchers for the abrasive wear [14-19]. Those tribo formulas were expressed mass loss of material as a function of properties such as operating settings, hardness indentation... is cut for microstructural study and hardness measurement. The hardness examination is performed through Vickers indentation method with 3 N load and 10 s dwell time. The laser processed specimens......
standard deviation after cycles, the reduction is even less significant. M3 sample shows a higher hardness (~54 HV), which is almost constant after thermal cycles. The average size of the indentation (i.e. arithmetic mean of the two diagonal lengths d1 and d2 of the indentation) and area of corresponding indentations, computed from the definition of Vickers hardness according to the standard EN ISO......
and polish the samples. The polished samples were measured with a load of 10 kg and an indentation time of 10 s. At least five points were tested in every test, and the results were averaged. The chemical... compressive property up to 6.60 GPa was obtained at 950 °C. Hardness value for FG80 sample is unavailable because fragmentation occurred around the indentation during the measurement, and the indentation......
is severely worn. The higher magni?cation image in Fig.10(b) highlights the signi?cant wear occurring during sliding. Grooves and indentation can be observed in the wear track. As the corundum ball is harder... on the La2O3-coating surface are worn down, but there is no groove, and indentation, delamination and crack can be found in the enlarged image (Fig.12(b)). The La2O3- coating is found to have considerable......
the hardness is expressed as a function of indentation depth (displacement into surface), i.e. variation of hardness from coating surface to substrate along cross-section. It can be seen that for the laser-treated Ni-P/Ni-W-P duplex coating, the hardness gradient presents a trend of declining from outer Ni-W-P to inner Ni-P except for indentation number 1 which may be outside the coating. The result......
from the macroscale inhomogeneous deformation, which is observed in the micro-bending experiments [15], nano/micro-indentation experiments [16], and torsion experiments [17]. The conventional.... Determination of indenter tip geometry and indentation contact area for depth-sensing indentation experiments [J]. J Mater Research, 1998, 13: 1300-1306. [17] FLECK N A, MULLER G M, ASHBY M F, Hutchinson J W......
H did not account for the deposited Cu hardness values, but it indicated the indentation value of the heat affected zone, fusion zone and the Ti6Al4V substrate. The microhardness (HV) values... of every indentation was substituted into Eqs. (1) and (2) to obtain the YS and the UTS. Dividing each UTS by YS, the strain hardening coefficient amounts to be 3.35. The graph is a perfectly straight......
and the base pressure of the vacuum chamber was 2×10-7 Pa. The hardness was measured by an indentation tester (Vickers). The maximum indentation load was 25 g and loading time was kept for 15 s. The adhesion......
Space Technology, 2003, 18(1): 35-48. [14] LAWN B R, MARSHALL D B. Hardness, toughness and brittleness: an indentation analysis[J]. Journal of American Ceramic Society, 1979, 62(7/8): 347-350. [15... N, TUNCDEMIR H, et al. A set of indices based on indentation test for assessment of rock cutting performance and rock properties[J]. Journal of the South African Institute of Mining and Metallurgy......
alcohol at 30 V and -30 °C for about 1 min. Micro hardnesses of the Inconel 718 superalloy were also measured for the laser surface-treated specimens using a Vickers indentation tester (HVS-1000... indentation sizes, the substrate seems to be harder than the laser surface-treated zones. Measurements show that the hardness of the substrate is HV (440±10). For all the three laser-treated specimens......