The work presents the results of the experimental research concerning the impact of a heat treatment (toughening) of aluminum bronze CuAl10Fe4Ni4 on its mechanical properties. The conditions of the experiments and selected results are described. A detailed description of the effects of individual heat treatment conditions namely low and high temperature aging is also presented in the work.
Secondary or multiple remelted alloys are common materials used in foundries. For secondary (recycled) Al-Si-Cu alloys, the major problem is the increased iron presence. Iron is the most common impurity and with presence of other elements in alloy creates the intermetallic compounds, which may negatively affect the structure. The paper deals with effect of multiple remelting on the microstructure of the AlS9iCu3 alloy with increased iron content to about 1.4 wt. %. The evaluation of the microstructure is focused on the morphology of iron-base intermetallic phases in caste state, after the heat treatment (T5) and after natural aging. The occurrence of the sludge phases was also observed. From the obtained results can be concluded that the multiple remelting leads to change of chemical composition, changes in the final microstructure and also increases sludge phases formation. The use of heat treatment T5 led to a positive change of microstructure, while the effect of natural aging is beneficial only to the 3rd remelting.
Improvement of Al-Si alloys properties in scope of classic method is connected with change of Si precipitations morphology through:
using modification of the alloy, maintaining suitable temperature of overheating and pouring process, as well as perfection of heat
treatment methods. Growing requirements of the market make it necessary to search after such procedures, which would quickly deliver
positive results with simultaneous consideration of economic aspects. Presented in the paper shortened heat treatment with soaking of the
alloy at temperature near temperature of solidus could be assumed as the method in the above mentioned understanding of the problem.
Such treatment consists in soaking of the alloy to temperature of solutioning, keeping in such temperature, and next, quick quenching in
water (20 0
C) followed by artificial ageing. Temperature ranges of solutioning and ageing treatments implemented in the adopted testing
plan were based on analysis of recorded curves from the ATD method. Obtained results relate to dependencies and spatial diagrams
describing effect of parameters of the solutioning and ageing treatments on HB hardness of the investigated alloy and change of its
microstructure. Performed shortened heat treatment results in precipitation hardening of the investigated 320.0 alloy, what according to
expectations produces increased hardness of the material.
Mechanical and technological properties of castings made from 3xx.x alloys depend mainly on properly performed process of melting and
casting, structure of a casting and mould, as well as possible heat treatment. Precipitation processes occurring during the heat treatment of
the silumins containing additives of Cu and/or Mg have effect on improvement of mechanical properties of the material, while choice of
parameters of solutioning and ageing treatments belongs to objectives of research work performed by a number of authors. Shortened heat
treatment, which is presented in the paper assures suitable mechanical properties (Rm), and simultaneously doesn’t cause any increase of
production costs of a given component due to long lasting operations of the solutioning and ageing. Results of the research concern effects
of the solutioning and ageing parameters on the Rm tensile strength presented in form of the second degree polynomial and illustrated in
spatial diagrams. Performed shortened heat treatment results in considerable increase of the Rm tensile strength of the 320.0 alloy as early
as after 1 hour of the solutioning and 2 hours of the ageing performed in suitable.
Neodymium-Iron-Boron (Nd-Fe-B) magnets are considered to have the highest energy density, and their applications include electric motors, generators, hard disc drives, and MRI. It is well known that a fiber structure with a high aspect ratio and the large specific surface area has the potential to overcome the limitations, such as inhomogeneous structures and the difficulty in alignment of easy axis, associated with such magnets obtained by conventional methods. In this work, a suitable heat-treatment procedure based on single-step and multistep treatments to synthesize sound electrospun Nd-Fe-B-O nanofibers of Φ572 nm was investigated. The single-step heat-treated (directly heat-treated at 800°C for 2 h in air) samples disintegrated along with the residual organic compounds, whereas the multistep heat-treated (sequential three-step heat-treated including three steps;: dehydration (250°C for 30 min in an inert atmosphere), debinding (650°C for 30 min in air), and calcination (800°C for 1 h in air)) fibers maintained sound fibrous morphology without any organic impurities. They could maintain such fibrous morphologies during the dehydration and debinding steps because of the relatively low internal pressures of water vapor and polymer, respectively. In addition, the NdFeO3 alloying phase was dominant in the multistep heat-treated fibers due to the removal of barriers to mass transfer in the interparticles.
The study presented in this paper concerned the possibility to apply a heat treatment process to ductile cast-iron thin-walled castings in order to remove excessive quantities of pearlite and eutectic cementite precipitates and thus meet the customer’s requirements. After determining the rates of heating a casting up to and cooling down from 900°C feasible in the used production heat treatment furnace (vh = 300°C/h and vc = 200°C/h, respectively), dilatometric tests were carried out to evaluate temperatures Tgr, TAc1start, TAc1end, TAr1start, and TAr1end. The newly acquired knowledge was the base on which conditions for a single-step ferritizing heat treatment securing disintegration of pearlite were developed as well as those of a two-step ferritization process guaranteeing complete disintegration of cementite and arriving at the required ferrite and pearlite content. A purely ferritic matrix and hardness of 119 HB was secured by the treatment scheme: 920°C for 2 hours / vc = 60°C/h / 720°C for 4 hours. A matrix containing 20–45% of pearlite and hardness of 180–182 HB was obtained by applying: 920°C for 2 hours or 4 hours / vc = 200°C/h to 650°C / ambient air.
Heat treatment processes, due to qualitative requirements for the cast machinery components and restrictions on energy consumption resulting on the one hand from environmental concerns, and on the other hand from a requirements coming from minimization of manufacturing costs, are resulting in searching after a technologies enabling obtainment of satisfactory results, in form of improved mechanical properties mainly, while minimizing (limiting) parameters of successive operations of the heat treatment. Heat treatment of the T6 type presented in this paper consists in operations of heating of investigated alloys to suitably selected temperature (range of this temperature was evaluated on the base of the ATD method), holding at such temperature for a short time, and next rapid cooling in water (20 oC) followed by artificial ageing, could be such technology in term s of above mentioned understanding of this issue. Performed T6 heat treatment with limited parameters of solutioning operation resulted in visible increase in tensile strength Rm of AlSi7Mg, AlSi7Cu3Mg and AlSi9Cu3(Fe) alloys.
The influence of the hold time of the austempering heat treatment at 280°C on the microstructure and corrosion resistance in NaCl-based media of austempered ductile iron was investigated using X-ray diffraction, micro-hardness measurements, corrosion tests and surface observations. Martensite was only found in the sample which was heat treated for a short period (10 minutes). Corrosion tests revealed that this phase does not play any role in the anodic processes. Numerous small pits were observed in the α-phase which is the precursor sites in all samples (whatever the value of the hold time of the austempering heat treatment).
The effect of heat treatment on the corrosion resistance of Ti-6Al-4V alloy was investigated in the artificial saliva solution (MAS). It has been revealed that the thermal annealing treatment temperature favors the cathodic reactions and reduce the protective properties of passive film. The heat treatment causes the enrichment of β phase in vanadium. The lowest corrosion resistance in the artificial saliva revealed the Ti-6Al-4V alloy heated for 2 hours at 950°C. Heterogeneous distribution of vanadium within the β phase decreases the corrosion resistance of the Ti-6Al-4V.
In the present time, advanced high strength steel (AHSS) has secured a dominant place in the automobile sector due to its high strength and good toughness along with the reduced weight of car body which results in increased fuel efficiency, controlled emission of greenhouse gases and increased passengers’ safety. In the present study, four new advanced high strength steels (AHSS) have been developed using three different processing routes, i.e., thermomechanical controlled processing (TMCP), quenching treatment (QT), and quenching & tempering (Q&T) processes, respectively. The current steels have achieved a better combination of the high level of strength with reasonable ductility in case of TMCP as compared to the other processing conditions. The achievable ultrahigh strength is primarily attributed to mixed microstructure comprising lower bainite and lath martensite as well as grain refinement and precipitation hardening.
In earlier works were described trends in the production of tools for die casting (hot work). Almost the entire set of issues dealt with may seem insignificant when incompletely assembled acceptance of the material and the associated risks of processing a material with an inappropriate structure, leading to a very early defect of the die. Therefore, further work will focus particularly on identifying the causes of thermal cracks and preventing a suitable choice of acceptance criteria conditions and heat treatment.
Very well-known advantages of aluminum alloys, such as low mass, good mechanical properties, corrosion resistance, machining-ability,
high recycling potential and low cost are considered as a driving force for their development, i.e. implementation in new applications as
early as in stage of structural design, as well as in development of new technological solutions. Mechanical and technological properties of
the castings made from the 3xx.x group of alloys depend mainly on correctly performed processes of melting and casting, design of a
mould and cast element, and a possible heat treatment.
The subject-matter of this paper is elaboration of a diagrams and dependencies between parameters of dispersion hardening (temperatures
and times of solutioning and ageing treatments) and mechanical properties obtained after heat treatment of the 356.0 (EN AC AlSi7Mg)
alloy, enabling full control of dispersion hardening process to programming and obtaining a certain technological quality of the alloy in
terms of its mechanical properties after performed heat treatments. Obtained results of the investigations have enabled obtainment of a
dependencies depicting effect of parameters of the solutioning and ageing treatments on the mechanical properties (Rm, A5 and KC impact
strength) of the investigated alloy. Spatial diagrams elaborated on the basis of these dependencies enable us to determine tendencies of
changes of the mechanical properties of the 356.0 alloy in complete analyzed range of temperature and duration of the solutioning and
ageing operations.
Automation of machining operations, being result of mass volume production of components, imposes more restrictive requirements
concerning mechanical properties of starting materials, inclusive of machinability mainly. In stage of preparation of material, the
machinability is influenced by such factors as chemical composition, structure, mechanical properties, plastic working and heat treatment,
as well as a factors present during machining operations, as machining type, cutting parameters, material and geometry of cutting tools,
stiffness of the system: workpiece – machine tool – fixture and cutting tool.
In the paper are presented investigations concerning machinability of the EN AC-AlSi9Cu3(Fe) silumin put to refining, modification and
heat treatment. As the parameter to describe starting condition of the alloy was used its tensile strength Rm. Measurement of the machining
properties of the investigated alloy was performed using a reboring method with measurement of cutting force, cutting torque and cutting
power. It has been determined an effect of the starting condition of the alloy on its machining properties in terms of the cutting power,
being indication of machinability of the investigated alloy. The best machining properties (minimal cutting power - Pc=48,3W) were
obtained for the refined alloy, without heat treatment, for which the tensile strength Rm=250 MPa. The worst machinability (maximal
cutting power Pc=89,0W) was obtained for the alloy after refining, solutioning at temperature 510 o
C for 1,5 hour and aged for 5 hours at
temperature 175 o
C. A further investigations should be connected with selection of optimal parameters of solutioning and ageing
treatments, and with their effect on the starting condition of the alloy in terms of improvement of both mechanical properties of the alloy
and its machining properties, taking into consideration obtained surface roughness.
Mg-0.5Si-xSn (x=0.95, 2.9, 5.02wt.%) alloys were cast and extruded at 593K (320 ºC) with an extrusion ratio of 25. The microstructure and mechanical properties of as-cast and extruded test alloys were investigated by OM, SEM, XRD and tensile tests. The experimental results indicate that the microstructure of the Mg-0.5Si-xSn alloys consists of primary α-Mg dendrites and an interdendritic eutectic containing α-Mg, Mg2Si and Mg2Sn. There is no coarse primary Mg2Si phase in the test alloys due to low Si content. With the increase in the Sn content, the Mg2Si phase was refined. The shape of Mg2Si phase was changed from branch to short bar, and the size of them were reduced. The ultimate tensile strength and yield strength of Mg-0.52Si-2.9Sn alloy at the temperature of 473K (200 ºC) reach 133MPa and 112MPa respectively. Refined eutectic Mg2Si phase and dispersed Mg2Sn phase with good elevated temperature stability are beneficial to improve the elevated temperature performance of the alloys. However, with the excess addition of Sn, large block-like Mg2Sn appears around the grain boundary leading to lower mechanical properties.
One type of spheroidal cast iron, with additions of 0.51% Cu and 0.72% Ni, was subjected to precipitation hardening. Assuming that the
greatest increase in hardness after the shortest time of ageing is facilitated by chemical homogenisation and fragmentation of cast iron
grain matrix, precipitation hardening after pre-normalisation was executed. Hardness (HB), microhardness (HV), qualitative and
quantitative metalographic (LM, SEM) and X-ray structural (XRD) tests were performed. The acquired result of 13.2% increase in
hardness after ca. 5-hour ageing of pre-normalised cast iron confirmed the assumption.
The paper attempts to analyze distortions of cast iron and cast steel rings, after heat treatment cycles. The factors influencing distortion are: chemical composition of material, sample geometry, manufacturing process, hardenability, temperature and heat treatment method. Standard distortion tests are performed on C-ring samples. We selected a ring-model, which approximate the actual part, so that findings apply to gear rings. Because distortion depends on so many variables, this study followed strictly defined procedures. The research was started by specifying the appropriate geometry of the samples. Then, the heat treatment was conducted and samples were measured again. The obtained results allow to determine the value of the resulting distortion and their admissibility. The research will be used to evaluate the possibility of using the material to produce parts of equipment operated under extreme load conditions.
The article presents results of heat treatment on the high chromium cast iron. The study was carrying out on samples cut from the casting
made from chromium cast iron. Those were hardened at different temperatures, then tempered and soft annealed. The heat treatment was
performed in a laboratory chamber furnace in the Department of Engineering Alloys and Composites at Faculty of Foundry Engineering
AGH. At each stage of the heat treatment the hardness was measured by Vickers and Rockwell methods, and the microscope images were
done. Additionally based on images from the optical microscope the microstructure was assessed. Based on these results, the effect of
hardening, tempering and soft annealing on the microstructure and hardness of high chromium cast iron was studied. Next the effects of
different hardening temperatures on the properties of high chromium cast iron were compared. The study led to systemize the literature
data of the parameters of heat treatment of high chromium cast iron, and optimal conditions for heat treatment was proposed for casts of
similar properties and parameters.
The work presents experiment results from the area of copper casting technology and chosen examples of alloyed copper. At present,
copper casting technology is applied in many branches of industrial manufacturing, especially in the sector of construction,
communications, arms and power engineering. Alloyed copper, containing slight additions of different elements and having special
physio-chemical properties, is used in a special range of applications. Copper technology and alloyed copper analyses have been presented,
these materials being used for cast manufacturing for power engineering. The quality of casts has been assessed, based on their
microstructure analysis, chemical content and the cast properties. During the research, special deoxidizing and modifying agents were
applied for copper and chosen examples of alloyed copper; also exemplary samples were tested with the help of metallographic analysis,
electrical conductivity and gaseous impurities research.