Wear behavior of cold pressed and sintered Al2O3/TiC/CaF2-Al2O3/TiC laminated ceramic composite

The variant selection of martensites (e-M and a 0-M) and e-M reversion in dynamic tensile high-manganese TRIP steel were investigated. a 0-M variant pairs with a zigzag morphology frequently formed, and the pairs of neighboring a 0-M variants were examined in terms of mechanical work and strain energy reduction. The occurrence of a primary a 0-M variant is determined by mechanical work, but high products of mechanical work and strain energy reduction are essential for secondary variant selection. In contrast to a 0-M variant pair selection, e-M variant selection can be attributed to the highest mechanical work. During e-M?a 0-M transformation, the mechanical work of e-M reversion is higher than that of a 0-M variant, thereby implying that e-M reversion in h110i c grain is possible. e-M plate distribution also affects the feasibility of e-M reversion.

Section: Microstructural Characterizationmentioning

confidence: 78%

“…In our previous work [20], mechanical work and strain energy are considered to examine a 0 -M variant selection in h111i c grain under dynamic tension. However, the effects of mechanical work and strain energy on a 0 -M variant pair selection are unclear.…”

Section: Introductionmentioning

confidence: 99%

Different Mechanisms of ε-M and α′-M Variant Selection and the Influencing Factors of ε-M Reversion During Dynamic Tension in TRIP Steel

Wang

Yang

Jin

et al. 2017

“…Reducing energy and material losses in moving mechanical assemblies, such as turbine hardware, high-temperature dies and molds, cutting tools and heat treatment fixtures, still have been a challenging due to the friction and wear in recent year [1]. Researchers made a great effort developing good solid lubricant which can potentially provide low friction and wear even under severe operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Tribological Behaviors of Ni3Al Intermetallics with MoO3 Multilayer Ribbon Crystal Prepared by Spark Plasma Sintering

Zhai

Shi

Yang

et al. 2017

This study reports that small amounts of MoO 3 multilayer ribbon crystal (MoO 3 MLRC) in Ni 3 Al intermetallics showed the decreased friction coefficients and improved wear resistance at different contact loads. Specifically, the friction coefficients (0.32-0.34) and wear rates [(2-4) 9 10 -5 mm 3 N -1 m -1 ] are significantly reduced for Ni 3 Al at 2-8 N. A possible explanation for the friction and wear reduction is that MoO 3 MLRC as a multilayer material shears easily in the tribo-layer during the sliding contact, and provides low friction. In addition, this MoO 3 MLRC with excellent bending strength is found to dissipate shear stress and suppress severe plastic deformation under a cyclic stress, thus drastically improving wear resistance of Ni 3 Al.

“…Self-lubricating composites containing solid lubricants could overcome these shortcomings owing to the excellent self-lubricating properties at elevated temperatures and under long-time work conditions. Yang et al [5] investigated the tribological behavior of Al 2 O 3 /TiC/CaF 2 -Al 2 O 3 /TiC-laminated ceramic composites prepared by cold pressing and sintering and reported that Al 2 O 3 /TiC/CaF 2 -Al 2 O 3 /TiC-laminated ceramic composites exhibited smaller friction coefficient and lower wear rate than those of Al 2 O 3 /TiC ceramic after the addition of solid lubricant CaF 2 . Zhang et al [6] studied the wear performance of NiCr/AgVO 3 self-lubricating composites and found that NiCr/AgVO 3 showed the better tribological behavior than NiCr alloy from 25 to 800°C mainly due to the lubricating effect of AgVO 3 .…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of TiAl–Multilayer Graphene–Ag Composites at Different Temperatures and Sliding Speeds

Zou

Shi

Shen

et al. 2017

Tribological behavior of TiAl-multilayer graphene-Ag composites (TMACs) prepared by spark plasma sintering against a Si 3 N 4 ball was investigated on a ball-on-disk high-temperature tribometer at different test temperatures and sliding speeds in this study. The test results showed that TMACs had the lower friction coefficient and less wear rate at 450°C-0.25 m/s, which was attributed to the formation of the high-strength and intact tribofilms on worn surface. At 450°C-0.25 m/s, during the sliding process, multilayer graphene (MLG) was ground out to form the high-strength skeletons on the worn surface of TMACs. Ag was migrated from the worn surface and combined with the MLG skeleton to form the high-strength and intact tribofilms. The high-strength and intact tribofilms were beneficial to lowering the friction coefficient for the lubricating effect of Ag and decreasing wear rate for the enhancing effect of MLG skeleton.