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- Technical Questions Of Metallurgy
- Metallurgy interview questions and answers
- Metallurgy Interview Questions & Answers
- Fresh Metallurgy Interview Questions & Answers:
Mild steel is an alloy of iron and carbon with percentage of carbon ranging from.
Do you have exposure in understanding physical and chemical behaviour of metals and alloys? Metallurgy is a domain of material science and engineering that studies the physical and chemical behaviour of metallic elements their inter metallic compounds and their mixtures which are called alloys. Metallurgists develop and manufacture metal items and structures that tiny precision made components to huge engineering parts. Metallurgists usually specialises in a specific area such as process, chemical or structural metallurgy.
Technical Questions Of Metallurgy
Do you have exposure in understanding physical and chemical behaviour of metals and alloys? Metallurgy is a domain of material science and engineering that studies the physical and chemical behaviour of metallic elements their inter metallic compounds and their mixtures which are called alloys. Metallurgists develop and manufacture metal items and structures that tiny precision made components to huge engineering parts.
Metallurgists usually specialises in a specific area such as process, chemical or structural metallurgy. So, engineering graduates with metallurgy as a branch can try out their luck as metallurgist, metallurgical engineer, quality engineer, mineral processing engineer, refining and midstream engineer, product development engineer etc by looking at the below listed metallurgy job interview questions and answers and choose your rewarding career.
This transformation happens during tempering heat treatment of quenched steels, or during slow cooling in that temperature range.
It is fine dispersed carbide in a ferrite needlelike matrix. Question 2. Answer : Steel is an alloy of iron and carbon, consisting of iron phase and iron carbides. Crude steel produced from iron contains an undesirable amount of oxygen and some sulphur.
Manganese plays a key role because of two important properties: its ability to combine with sulphur and its powerful deoxidation capacity. Desulphurization processes reduce the need for manganese in this respect. Some 30 of the manganese used today is still used for its properties as a sulphide former and deoxidant. The other 70 of the manganese is used purely as an alloying element. These alloying uses depend on the desired properties of the steel being made. Steel, as has been noted, contains iron and carbon.
At room temperature, iron crystallizes into a bodycentered cubic structure named alpha iron ferrite. At a high temperature above degrees C , the structure is transformed into a facecentered cubic form, which is called a gamma iron austenite.
When the steel is cooled down slowly, the carbon, soluble in austenite, precipitates as iron carbide called cementite, the austenite transforms to ferrite and they precipitate together in a characteristic lamellar structure known as pearlite. Question 3. Answer : Alloying elements in stainless steels can be divided into 2 main categories namely austenite and ferrite stabilizers.
Austenite stabilizers must be present in austenitic as well as martensitic STSs austenite at annealing temperature is the precursor phase for these two categories although for the latter group, it transforms to martensite before cooling down to room temperature.
In order to stabilize austenite at annealing temperature, the ratio of austenite to ferrite stabilizers must be high. Niequivalent to Crequivalent ratio is an effective way to quantify the austenite formation tendency of STSs. There are different expressions for Creq and Nieq, one of which looks like this:. Question 4. Answer : Isothermal Transformation IT and Continuous Transformation CT diagrams are diagrams used to investigate kinetic aspect of phase transformations and are of extensive use in steels heat treatment.
In these diagrams generally called TimeTemperatureTransformation TTT , the abscissa is time in logarithmic scale and ordinate is temperature. The C shaped curves indicate the onset and the end of diffusion civilian transformations e. IT diagram shows what happens when steel is held at a constant temperature for a prolonged period. The development of the microstructure with time can be followed by holding small specimens in a lead or salt bath and quenching them one at a time after increasing holding times and measuring the amount of phases formed in the microstructure with the aid of a microscope.
An alternative method involves using a single specimen and a dilatometer, which records the elongation of the specimen as a function of time. The basis for the dilatometer method is that the micro constituents undergo different volumetric changes and thus, the onset of transformations could be detected.
Question 5. Answer : Gold Au and mercury Hg are two separate metals. Therefore, from pure mercury you cannot extract Gold. Amalgamation is better suited to ores in which the gold occurs in the free and cores state. Fine particles of Gold are better treated by Cyanidation. Gold dissolves in aqua regia.
Aqua Regia is a mixture of hydrochloric acid and nitric acid. It can dissolve gold, which single acids alone cannot do. Here we see that each of the acids separately has no effect on the gold but a mixture of the two dramatically reacts with the gold. To three samples of gold are added. Question 6. Answer : Iron is a metal with polymorphism structure. Each structure stable in the range of temperature, for example deltairon with bcc structure in the range of C changes to gamma Iron with fcc in the range of C and gamma iron to AlfaIron etc.
For hardening of the metal, this quality of iron is exploited. Question 7. Answer : The preheating is application of heat to a base metal immediately before welding. Preheating helps reduce hardness in the metal. In addition, the application of heat to the weld immediately after welding is postheating. The Post heating helps reduce stress in the weld metal. Question 8. If these variables are not kept well controlled, they may cause very different results.
Question 9. Answer : In the solid state, metals have a crystalline structure made of metal atoms, which are drawn together by low force vanderwaals interactions. The electrons form a cloud around the atom structure and migrate from one point to the other constantly. The structured state of the atoms allows for low entropy in this state. Depending on the metal, several different structures may form, and one metal may have more than one structure at different temperatures, since its entropy depends on atom vibration as well, which is connected to the internal energy, reflected as temperature.
Crystalline structures have, usually, a straight correlation of stress in the elastic region. When traction stress is applied, the atoms are forced away from each other, up to a point where it, theoretically, should loose coherence by breaking all interactions at once and forming new surfaces.
This energy level is so high that other mechanisms of energy dissipation happen first, usually connected to defects and dislocations in the crystalline structure.
These mechanisms allow for the inducing of surface cracking, or plastic deformation. Question Answer : Brass is an alloy of copper and zinc, with varying degrees of mixing. It is a substitution alloy, which means the copper and zinc elements substitute each other in microstructure matrix positions. Usually, the possibility of heat treatment will depend on what are you trying to achieve. For the substitution range of compositions, for example, you cannot obtain hardening from heattreating.
This locking of the dislocations is brought about because the strain energy due to the distortion of a solute atom can be relieved if it fits into a structural region where the local lattice parameter approximates to that of the natural lattice parameter of the solute. Thus, where both dislocations and solute atoms are present in the lattice, interactions of the stress field can occur, resulting in a lowering of the strain energy of the system.
This provides a driving force tending to attract solute atoms to dislocations and if the necessary time for diffusion is allowed, a solute atom 'atmosphere' will form around each dislocation. Answer : The formation of new equiaxed grains in the heating process, instead of the oriented fibrous structure of the deformed metal is called re crystallizations. The temperature required for the beginning of the re crystallizations is characteristic of each metal but depends on number of factors and firstly up on the degree of deformation.
The higher the degree of deformation, the lower the re crystallizations temperature will be. In the process of the re crystallization of such metals as iron, copper, and aluminum, the new crystals sometimes grow in an oriented arrangement and the so called re crystallization texture is obtained. The effect of foreign atoms in solid solution on the rate of re crystallization is almost apparent at very concentrations.
The change in the re crystallization temperature caused by the presence of foreign atoms depends markedly up on the nature of the solute atoms. Answer : If you are not familiar with the FeC binary phase diagram, please try to download it before reading the answer below, because without such prior knowledge, it might be difficult to figure out my answer.
Using keywords "FeC", "phase", and "diagram" in search engines like Google, you can easily find this diagram. As you probably know, in the ironcarbon binary phase diagram, which in addition to some other purposes is used to predict phase transformations in steels and cast irons, there, is a eutectoid reaction wherein austenite phase decomposes to a mixture of ferrite and cementite upon cooling. What Is The Metallurgy Use? Answer : Actually, you asked a question, which requires a very longwinded answer.
In summary, actually, you asked a question, which requires a very longwinded answer. In summary, metallurgy i. Casting is a forming method based on melting metals and pouring them into molds with desired shapes, so that after solidification desired properties are achieved. Forging is a solid state forming method, which means it involves no melting. Forging stock is heated up to the appropriate temperature it is usually so hot that appears red or white and then application of pressure leads to plastic deformation of stock.
Therefore, stock takes on the negative shape of die. Heating facilitates forming, i. Forging products usually are of higher quality and have a higher manufacturing cost compared to castings.
Some parts cannot be used in the cast form because of the defects inherent to casting most grades of steels while some other metals are so brittle that they cannot be forged e. Indeed, there are some metals, which can be produced by either of the methods.
The standard applicable to the part determines which form must be used. Answer : Since gold is very a noble metal, it does not dissolve in conventional solvents used to leach. Answer : It really does not matter the concentration of gold in the DBC, it will respond well to very small concentrations or it will generally load up at about 25 grams of gold in a liter of DBC.
Therefore, if your original acid had 50 grams of gold in it, you would do two extractions into DBC using a liter of the extracting solvent. You should continue to extract from the pregnant gold solution until you are sure no gold is left in it.
If the pH of the acid solution is not too high a simple stannous chloride test will tell you if there is still gold in it, and that is sensitive to the ppb level. Answer : Solution annealing is carried out by heating up the alloy to a temperature in which typically only one phase is stable.
Metallurgy interview questions and answers
Carbide is a chemical compound in which carbon is combined with a metallic or semi-metallic element. Materials can be broadly classified into metallic, polymeric, ceramic, and composite. The microstructure of the material is influenced by its physical properties which in turn govern the application of these materials in industrial practice. Steel is made of iron, carbon, and some other alloy, and non-alloyed. Different alloy elements have different effects on steel Mechanical and Physical properties. C Carbon is the most important constituent of steel.
Describe the Crystal Structure of Metals? What are Twin Boundaries in Surface Defects? What are the Effects of Cold Work on Properties? What are the Properties on Annealing of Cold Worked Metal? What are the Anisotropic Properties in Annealed State of Metals? How does Ductile Fracture Occurs?
Metallurgy Interview Questions & Answers
What is Iron Ferrite, what is it used for, and where is it found? Well, a few definitions match your question. First, "ferrite" is the name metallurgists give to the body-centered-cubic phase of iron and its alloys. The 'body-centered-cubic' phrase refers to the way the atoms are arranged in the lattice, to distinguish it from "austenite" which is the face-centered-cubic arrangement.
Study the given problem carefully and answer the following questions: Problem-An organic compound A C 2H 4O 2 is a constituent of wine. This compound, on heating with alkaline potassium permanganate gets oxidised to, give, another compound B which turns blue litmus red. Identify compound A.
Fresh Metallurgy Interview Questions & Answers:
Metallurgy technical job interview questions of various companies and by job positions. Extractive Metallurgy. Manufacturing Process.
Interview Guides Education and Science Metallurgy. Metallurgy Interview Questions and Answers will guide us now that Metallurgy is a domain of materials science that studies the physical and chemical behavior of the metallic elements, their intermetallic compounds and their mixtures, which are called alloys. In Metallurgy Interview Questions and Answers you will learn that it is also the technology of metals and the way in which science is applied to their practical use. This transformation happens during tempering heat treatment of quenched steels, or during slow cooling in that temperature range. It is fine dispersed carbide in a ferrite needle-like matrix. Is This Answer Correct?
+ Metallurgy Interview Questions and Answers, Question1: What is carbide? Question2: What are the properties and application of manganese steel?
Explain Super Alloys. What makes them useful for land-based turbines? What is D2?
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Сьюзан даже вздрогнула от неожиданности. - Вам нужен ключ. Я поняла так, что весь смысл в том, чтобы его уничтожить. - Верно. Но я хочу иметь копию.
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Меган сказала, что, если тереть глаза, будет только хуже.