MTW European Type Trapezium Mill
Input size:30-50mm
Capacity: 3-50t/h
LM Vertical Roller Mill
Input size:38-65mm
Capacity: 13-70t/h
Raymond Mill
Input size:20-30mm
Capacity: 0.8-9.5t/h
Sand powder vertical mill
Input size:30-55mm
Capacity: 30-900t/h
LUM series superfine vertical roller grinding mill
Input size:10-20mm
Capacity: 5-18t/h
MW Micro Powder Mill
Input size:≤20mm
Capacity: 0.5-12t/h
LM Vertical Slag Mill
Input size:38-65mm
Capacity: 7-100t/h
LM Vertical Coal Mill
Input size:≤50mm
Capacity: 5-100t/h
TGM Trapezium Mill
Input size:25-40mm
Capacity: 3-36t/h
MB5X Pendulum Roller Grinding Mill
Input size:25-55mm
Capacity: 4-100t/h
Straight-Through Centrifugal Mill
Input size:30-40mm
Capacity: 15-45t/h
Grain boundary no precipitation zone
Precipitatefree zones formation at grain boundaries in γ/γ′ Ni
2024年5月29日 Formation and growth of secondary γ′ precipitatefree zones (PFZ) in the vicinity of grain boundaries in five Nibased superalloys have been investigated for different heat 2016年5月18日 Solute and vacancy depletion have long been investigated to reveal the formation mechanism of grain boundary precipitatefree zones (GBPFZ) during ageing, yet there is no conclusive explanation due to the Formation mechanisms and evolution of precipitate 2022年4月1日 It was found that precipitates on high angle grain boundaries were ≈3 times larger than those formed on low angle boundaries The grain boundary precipitate size decreased by Precipitation on grain boundaries in AlMgSi alloys: The role of 2024年2月1日 In this work, we innovatively propose a strainconcentration controlled strategy to realize the controllable fabrication of the thinner precipitatefree zone (PFZ), associated with Controllable precipitation behavior near grain boundaries enabled
Development of Grain Boundary PrecipitateFree Zones in a Ni
2017年2月16日 Precipitatefree zones (PFZs) adjacent to grain boundaries (GBs) are common in precipitationhardened alloys and are detrimental as they act as “soft areas” compared to 2021年7月11日 Because Al alloys are polycrystalline, fast diffusion of vacancies to grain boundaries (GBs) take place during AA, which also transports solute The consequence is the formation of precipitation free zones (PFZs) along GBs, The relation between grain boundary precipitate 1996年5月1日 The sensitization behavior of Al 5xxx alloys is mainly caused by the formation of Mgrich precipitates at grain boundaries In this study, a classical [PDF] Modelling of grain boundary segregation, precipitation and precipitation behavior at grain boundaries (GBs) compared to the grain interiors Solute segregation could accelerate the precipitation behavior at GBs, which causes the formation of Grain boundary segregation and precipitation in an AlZnMgCu
Neartheoretical strength and deformation stabilization achieved
2024年10月28日 Grain boundary hardening and precipitation hardening are important mechanisms for enhancing the strength of metals Here, we show that these two effects can 2012年4月1日 In Allvac 718Plus nonuniform precipitation of a δlike phase was observed along the grain boundaries; however, no relation was found between grainboundary misorientation and the occurrence of Grainboundary precipitation in Allvac 718Plus Request PDF2012年11月28日 An additional condition must be fulfilled in a order such that the grain boundary preserves a average null curvature, eg the chemical potential remains constant all along the grain boundary; the puckered grain boundary must preserve its initial orientation at the junctions with the nucleusPrecipitation at Grain Boundaries SpringerLink2021年4月1日 The line scanning results indicated that there was no solute depletion zone in the region between the grain boundary precipitate and the matrix and that under artificial aging (180 °C for 4 h), the solute elements Cu and Mg will significantly segregate to the grain boundary to form Sphase precipitates; these precipitates will be continuously distributed on the grain Regulating solute partitioning utilized to decorate grain boundary
Effects of grain boundary structure on carbide precipitation in
2001年7月13日 The heataffected zone (HAZ) produced by welding in stainless steel has higher susceptibility to intergranular corrosion, which is attributed to the Cr depletion induced by grainboundary carbide Artificial ageing above 165 °C directly after quenching induces the formation of ~50 nm wide precipitatefree zone (PFZ) and ~100 nm wide precipitate Natural ageing could fundamentally alter the precipitation near grain boundary, and is a promising method to optimize the precipitation hardening in high strength aluminum alloys with Naturalageingenhanced precipitation near grain boundaries 2020年11月5日 The precipitation kinetics, as observed in terms of volume fraction, average radius, and number density, is almost identical next to the depletion zone in the bulk and far inside the bulk grain Grain boundary segregation and precipitation in an AlZnMg 2017年6月7日 Grain boundary precipitates in Inconel 718 and ATI 718Plus are important to control during hot working processes, since they can control the grain sizeGrain boundary precipitation in Inconel 718 and ATI 718Plus
Influence of Grain Boundary Precipitates on Intergranular
2022年2月14日 The effects of the grain boundary precipitation on intergranular corrosion behavior were investigated by exfoliation tests and complementary techniques like scanning electron microscope (SEM), optical profilometry (OP), transmission electron microscope together with energy dispersive spectroscopy (TEMEDS), and atomic force microscope (AFM) The 2024年4月24日 The evolution of segregation and precipitation at grain boundaries (GBs) in dilute alloys subjected to ion irradiation is investigated by combining phase field (PF) modeling and experiments The irradiation conditions and alloy parameters promoting the selforganization of finitesize precipitate structures at GBs are specifically investigated PF simulations indicate Grain Boundary Precipitation and SelfOrganization in Two OVERVIEW NO 58 GRAIN BOUNDARY AbstractPublished microstructural studies of grain boundary (gb) fracture in precipitation weichen und manchmal Verunreinigungsfreien Zone, OVERVIEW NO 58 GRAIN BOUNDARY DUCTILE FRACTURE IN PRECIPITATION 2022年5月13日 Concurrent Recrystallization and Precipitation for Combination of Superior Precipitation and Grain Boundary Hardening in Co 37 Cr 20 Ni 37 Ti 3 Al 3 HighEntropy Alloy Published: 13 May 2022 Volume 28, pages 2863–2873, (2022) ; Cite this articleConcurrent Recrystallization and Precipitation for Combination of
Mechanisms of grain boundary α precipitation in the metastable
2024年6月15日 A high angle grain boundary (50°) between grains β 1 and β 2 in the αheated condition showing (a) a selected area diffraction pattern inset from both grains, where β 1 is in [110] β1 zone axis and the corresponding dark field image from the selected β 1 reflection; and (b) a dark field image from the α and ω reflections in β 1 using the reflection indicated in the [110] 2024年5月29日 Formation and growth of secondary γ′ precipitatefree zones (PFZ) in the vicinity of grain boundaries in five Nibased superalloys have been investigated for different heat treatment times and temperatures A special focus has been placed on a high carbon containing version of the AD730™ alloy While the formation of PFZ is induced by the precipitation of Ti Precipitatefree zones formation at grain boundaries in γ/γ′ Ni Request PDF On Mar 1, 2015, Wenchao Yang and others published Grain boundary precipitation induced by grain crystallographic misorientations in an extruded Al–Mg–Si–Cu alloy Find, read Grain boundary precipitation induced by grain crystallographic 2016年10月1日 Grain boundary preprecipitation and its contribution to enhancement of corrosion resistance of Al–Zn–Mg alloy Author links open overlay panel Hui 621: 173−181 [15] RAMGOPAL T, GOUMA P I, FRANKLE G S Role of grain boundary precipitates and solutedepleted zone on the intergranular corrosion of aluminum alloy 7150 Grain boundary preprecipitation and its contribution to
The origin of the grain boundary precipitate free zone
The origin of the grain boundary precipitate free zone Origine de la zone exempte de precipite aux joints de grains Die ursache appreciable grain boundary precipitation may occur and then the effect of solute concentration as well as vacancy concentra tion on the nucleation of precipitates must be taken in to account131'321 ie a solute 2017年11月1日 The other interfacial terms, specifically between the two grains (σ γ1γ2) and between the η precipitate and the neighbouring grain (σ ηγ2) are a function of the grain boundary plane and misorientation; however, they would still be larger than the interfacial energy between the η precipitate and its own parent grain (σ ηγ1)Grain boundary precipitation in Inconel 718 and ATI 718Plusprecipitation behavior at grain boundaries (GBs) compared to the grain interiors Solute segregation could accelerate the precipitation behavior at GBs, which causes the formation of coarse precipitates and precipitate free zones along GBs Furthermore, the interplay of solute segregation and the local structure at GBs has been consideredGrain boundary segregation and precipitation in an AlZnMg 2001年2月2日 However, due to the solute segregation during the heat treatments of solution treating, quenching and ageing, precipitation heterogeneity is often observed in the vicinity of grain boundaries in age–hardenable Al alloys, which is characterized by the grain boundary precipitates and solute–depleted precipitate free zones (PFZs) adjacent to the grain Grain boundary segregation and precipitation in aluminium alloys
Modelling of grain boundary segregation, precipitation and
Aluminium alloys of the 7000 series with their high strength to weight ratio characteristics have been considered as a excellent choice in airftwne structure manufacturing The commercial application of the alloys, however, may be restricted by their poor characteristics such as resistance to stress corrosion cracidng which, it is reported, strongly depends on the gain grain boundary precipitation was measuredby not%rig the length of the precipitate intercepts alongthe grain boundary Measurements were made for all complex boundaries in each specimen, with theplane of grain boundary normalto the foil surface,and the fractional length of the boundary occupied by the precipitates, F, was calculatedA study of grain boundary precipitatefree zone formation inSemantic Scholar extracted view of "The origin of the grain boundary precipitate free zone" by P Unwin et al Skip to search form Skip to main content Skip to account menu Segregation assisted grain boundary precipitation in a model AlZnMgCu alloy Huan Zhao F De Geuser +4 authors D Raabe Materials Science Acta Materialia 2018; 192 The origin of the grain boundary precipitate free zone2023年2月10日 Even if this is not considered, the precipitation of the Gphase at the grain boundary and within the grain simultaneously “snatches” a large amount of Ni, Ti and Si atoms (Gforming elements), resulting in a precipitationfree zone (PFZ) near the grain boundary This kind of precipitationfree zone will also make the stress and strain Development of the highstrength ductile ferritic alloys via
Quantitative analysis of grain boundary diffusion, segregation and
2022年2月15日 Our results show that the fast diffusion flux proceeds primarily through the core region of the grain boundary, which is around 1 nm While the spatial range that the segregated solute atoms occupied is larger: below the saturation level, it is 1,2 nm; as the segregation saturates, it is 2–34 nm in most grain boundary areas2021年5月30日 During ageing, 6xxx aluminium alloys will develop a microstructure characterised by needleshaped Mg/Sirich precipitates in the bulk, precipitatefree zones along the grain boundaries and larger Mg/Sirich precipitates on the grain boundary Depending on, among other things, the size of the precipitatefree zone, these alloys are prone to The Role of Grain Boundary Precipitates during Intergranular Fracture precipitation behavior at grain boundaries (GBs) compared to the grain interiors Solute segregation could accelerate the precipitation behavior at GBs, which causes the formation of coarse precipitates and precipitate free zones along GBs Furthermore, the interplay of solute segregation and the local structure at GBs has been consideredGrain boundary segregation and precipitation in an AlZnMg 2007年11月20日 Transmission electron microscopy was used to study grain boundary precipitation of an Fe10Ni7Mn (wt pct) maraging steel during isothermal aging at 753 K Precipitation of a facecentered tetragonal (fct) θNiMn phase in association with solutedepleted precipitate free zone (PFZ) was found at prior austenite grain boundaries Precipitation Transmission Electron Microscopy Study on the Grain Boundary
Sensitization of Austenitic Stainless Steels: Current Developments
2021年3月22日 In this manuscript, the latest developments pertaining to sensitization are discussed Sensitization leads to intergranular corrosion and intergranular stress corrosion cracking The advantages and disadvantages of conventional methods to combat sensitization are elaborated Emerging/newer techniques such as grain boundary engineering, creation of 1 天前 And the summaries of statistical parameters of grainboundaries and matrix under various aging heat treatments are shown in Table 5 Generally, NIA samples exhibit larger GBPs compared to T6 samples Notably, the T6 sample lacks a distinct precipitationfree zone (PFZ), while the other samples display pronounced PFZs along the grain boundariesEffect of grain boundary precipitation on corrosion behaviour of 2007年3月1日 The effect of grain boundary (GB) type on precipitatefree zone (PFZ) width in friction stirprocessed 7075T7 Al alloy is investigated by transmission electron microscopy (TEM) and stereology(PDF) Relation between precipitatefree zone width and grain boundary 2017年4月7日 Microstructures of sample aged at 1023 K (750 °C) for 2 h showing, (a) γNi boundaries showing initial grain boundary (GB) precipitates, (b) a DP cell and its originating GB, (c) the reaction front of a DP cell, (d) DP cell showing branching (marked as ‘B’) and coarsening of the lamellae(e) and (f) show the nearGB precipitates conforming to particular orientations in a Kinetics and Grain Boundary Selectivity of Discontinuous Precipitation
Effect of PrecipitationFree Zone on Fatigue Properties
2024年11月18日 Request PDF Effect of PrecipitationFree Zone on Fatigue Properties in Al702Mg198Zn Alloys: but they are the best ones for relieving grain boundary (GB) stress concentrationalloys results in significantly greater amounts of grain boundary precipitation in these alloys than other precipitation hardened Al alloys Grain boundary fracture was a problem with these alloys that was not completely eliminated by removal of harmful impurities that segregate to the grain boundaries causing brittle grain boundary fracture (10)THE INFLUENCE OF GRAIN BOUNDARY PRECIPITATION ON THE 2022年4月1日 The grain boundary precipitate size decreased by a factor of 3 when the cooling rate increased from 3 to 80 °C/s with no precipitates observed at 1000 °C/s However, even for a cooling rate of 1000 °C/s, grain boundary precipitation was Precipitation on grain boundaries in AlMgSi alloys: The role of grain 1988年1月1日 The effects of microstructural factors on the intergranular fracture of AIZnMg alloys have been extensively studied, where the factors such as grain size, the nature of the precipi tates in the matrix, the width of precipitation free zone (PFZ), and the size and distribution of grain boundary precipitates have all been examined (13)Effect of grain boundary precipitates on the mechanical behavior
Grainboundary precipitation in Allvac 718Plus ScienceDirect
2012年4月1日 This suggests that once nucleation has occurred at a grain boundary, the precipitate can grow forward into the unrelated grain, or back into the grain in which it nucleated, leading to two mechanisms of growth: (i) discontinuous precipitation as described above; or (ii) growth into the host grain by the addition of diffusing species and by the transformation of γ′ [31]grain boundary initially held at 130°C (heat treatment SQHT13065PL) 41 323 TEM micrograph of thick section step quench and high temperature aged grain boundary initially held at 165°C (heat treatment SQHT16565PL) 41 324 Precipitate size distribution for highangle boundaries of thick sample held at 130°C and high temperature agedGrain Boundary Precipitation in Aluminum Alloy 7075 Virginia 2021年7月11日 WC Yang, SX Ji, Z Li, and MP Wang, Grain boundary precipitation induced by grain crystallographic misorientations in an extruded AlMgSiCu alloy J Alloys Compd 624 (open in a new window) (2015), pp 27–30 direct observation and analysis of failure initiation at the precipitatefree zoneThe relation between grain boundary precipitate formation and adjacent Grainboundary precipitation in Allvac 718Plus × Close Log In Log in with Facebook Log in with Google or Password Remember me on this computer or reset password Enter the address Electron diffraction patterns from grainboundary precipitates using a ½1 1 Grainboundary precipitation in Allvac 718Plus Academia
Effects of hotdeformation on grain boundary precipitation and
2017年12月1日 Rolling in the recrystallization region created a precipitationfree zone near both the grain boundary and grain interior, and the low hardness of ferrite may be caused by low carbide density in