Effect of Dual-stage Ageing and RRA Treatment  on the Three-body Abrasive Wear of the AW7075 Alloy

Lachowicz, Marzena; Leśniewski, Tadeusz; Lachowicz, M.

doi:10.5545/sv-jme.2022.142

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…It indicates that the formation of the ability to resist abrasive wear consists of a complex of characteristics of the phases that form the alloy, and from the interaction (bonds) between the phases. These conclusions are confirmed by the results of studies presented in [61][62][63].…”

Section: Wear Resistancesupporting

confidence: 80%

Effect of thermal treatment of chromium iron melts on the structure and properties of castings

Panichkin¹,

Wieleba²,

Kenzhegulov³

et al. 2023

Mater. Res. Express

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The article describes the results of experimental studies for the effect of thermal treatment (TTM) of G-X300CrMo27-1 high-chromium cast iron samples in the solid-liquid and liquid state on the structure, phase composition and properties of ingots. For ingots with a carbon content of 2.8 to 4.5 wt.%, cooled at a rate of 3.3 * 10-2 deg/s, the dependencies of the structure, phase composition, composition of primary, eutectic carbides and matrix, hardness HV and microhardness of its individual phases and resistance to abrasive wear from the temperature of isothermal holding at TTM. A significant effect of the TTM temperature of melts on the structure and properties of high-chromium cast iron ingots were detected. The temperatures of inflection on the plotted curves for the characteristics of the structure and properties of the ingots were associated with a phase transition in iron at 1400 0С and with a point on the phase diagram liquidus of the Fe-Cr system. This as well as an increase in the concentration of chromium in the composition of primary carbides with an increase in the TTM temperature up to 1480 0С, made it possible to assume that (Cr, Fe)7C3 clusters stable in composition were formed in the melt of such cast irons below 1500 0С. The reasons for the decrease in the size of primary carbides during G-X300CrMo27-1 molten chromium iron overheating above 1500 0С were substantiated based on these data. During the TTM of fine-crystalline ingots made of hypereutectic cast iron in the temperature range between the liquidus and solidus lines, it was detected that the primary carbides (Cr, Fe)7C3 recrystallized resulting in a significant decrease in the chromium content and an increase in the iron content in them. At the same time, their sizes did not change significantly. Their share increased, and the share of eutectic carbides decreased. Such process also had a significant impact on the properties of the resulting ingots. The most preferable temperatures of hot metal cast irons in the liquid and solid-liquid states were identified based on the results of the studies.

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Section: Wear Resistancesupporting

confidence: 80%

Effect of thermal treatment of chromium iron melts on the structure and properties of castings

Panichkin¹,

Wieleba²,

Kenzhegulov³

et al. 2023

Mater. Res. Express

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“…The presence of discontinuous precipitates GBPs also favors a high resistance to the initiation of fatigue cracks and a high impact strength [6,14,15]. At the same time, we observe resistance to general corrosion to state T6 as well as hardness close to that state, which ensures good tribological properties [34,61].…”

Section: Role Of Heat Treatmentmentioning

confidence: 67%

Metallurgical aspects of the corrosion resistance of 7000 series aluminum alloys – a review

Lachowicz

2023

Materials Science-Poland

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This article contains a review of selected studies conducted in the field of corrosion resistance of precipitation-hardenable 7000 series aluminum alloys. In particular, it discusses the effect of heat treatment and the role of thus formed microstructure on the corrosion behavior of these alloys. The article presents the three types of corrosion that occur most commonly in this group of materials in the context of their microstructure. It points to the importance of the chemical composition of a 7000 alloy, including the precipitates present in the microstructure, for the development of corrosion. The aluminum solid solution can act as an anode or cathode in relation to intermetallic particles. Such corrosion features may result in the destruction of the surfaces of elements made of the 7000 series aluminum alloy. It also raises the issue of the mechanism of corrosive destruction of the aluminum solid solution, which is connected with a crystallographic attack. In the case of this process, the nature of the micro-pits formed as a result of their local dissolution is related to the privileged dissolution of specific crystallographic planes and directions.

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“…In the case of excessive contact stress values, surface treatment might be necessary to increase the wear resistance of the surface layer [23,26].…”

Section: Methods Of Calculating and Evaluating The Fatigue Life Of We...mentioning

confidence: 99%

Strength analysis of welded joints in support structures of heavy machinery subjected to changeable loading conditions

Smolnicki,

Sokolski

2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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The durability of bearing units of large machines depends mainly on the condition of their welded joints. With this in mind, we developed numerical models of the analyzed bearing units, for which we performed FEM simulations of the stresses in welded joints in several basic load cases. In each of the respective variants the technical condition of the bearing nodes was different and it corresponded to the severity of the degradation processes. Different positions of the superstructure in relation to the undercarriage were also taken into account. The simulations used the hot-spot method dedicated to FEM analyses of complex welded structures. We discovered that the loads have a significant influence on the values and distribution of von Mises principal stresses and their axial components. Based on the carried out analyses, we identified the most unfavorable load cases that generate the highest stresses in the welded joints of the assessed nodes. We also demonstrated that the applied method effectively assesses the stresses of welded joints subjected to variable working loads.

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Effect of Dual-stage Ageing and RRA Treatment on the Three-body Abrasive Wear of the AW7075 Alloy

Cited by 5 publications

References 21 publications

Effect of thermal treatment of chromium iron melts on the structure and properties of castings

Effect of thermal treatment of chromium iron melts on the structure and properties of castings

Metallurgical aspects of the corrosion resistance of 7000 series aluminum alloys – a review

Strength analysis of welded joints in support structures of heavy machinery subjected to changeable loading conditions

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