Tool wear is a problem in machining titanium alloy, so it is of great importance to find out the wear mechanism of cutting tools in order to improve the cutting tool life time. The mechanism controlling the wear of cemented carbide and influence of cutting parameters on different wear modes in machining Ti6Al4V has been investigated in this paper. Diffusion and chemical wear at high cutting speed and feed rate and attrition in low speed and feed rate is suggested to be the dominant wear mechanism in this case. 1. Introduction Titanium shows a high strength-weight ratio and has exceptional corrosion resistance.
Bainite, pearlite and ferrite formed through annealing. In the other hand, the Hardening processes consist of quenching and tempering. They help in developing the appropriate bulk and surface properties. Martensite can be found in the structure of hardened or quenched steel. Martensite is a hard but brittle structure which needs tempering.
Mounting not only protects our sample but also by making its base flat and stable helps us while we are examining the sample under the microscope. In etching process, depending upon chemical composition, energy content and grain orientation, we determine the grain boundaries and the presence of chemically different phases. To reveal these micro structural details of the polished mount we used an etchant like 1% Nital.
This is due to it needing a higher pressure to create a forged component, even though its done at the same temperature as steel alloys. There are three groups of stainless steel that are mainly looked at when forging, austenitic, ferritic and martensitic. These aren’t the only groups of stainless steels, there are many special types that do not come under these categories. There is a group of steel alloys that are in the forging category but considered special stainless steel, due to the heat resistant
Introduction Galvannealed steel is preferred to galvanized one in the auto body panels for its improved properties like formability,welability, paintabillity etc. Iron is diffused into the zinc coating during galvannealed treatment. Although, a very high amount of iron in coating is undesirable as it results in a brittle coating that forms high amount of powder at the time of forming.Differentintermetallic phases of Fe-Zn system evolve and growwiththe increase in Fe content in coating. These phases differ in iron content, crystal structure and morphology and as a result, they differ in their properties. The overall coating properties are therefore greatly affected by the fraction of these phases in coating.
At high cutting speeds, the cutting fluid was responsible for reducing the scatter in the surface rough... ... middle of paper ... ..., M.W. Islam, S. Islam, M.A.H. Mithu, The influence of minimum quantity of lubrication (MQL) on cutting temperature, chip and dimensional accuracy in turning AISI-1040 steel, Journal of Materials Processing Technology 171 (2006) 93–99. Suresh Dhiman, S.K Sharma, Rakesh Sehgal, Vishal S. Sharma Influence of Approaching Angle and Cutting Parameters on Cutting force, Tool Tip Temperature and Surface Roughness During Turning of Adamite, International Journal for Manufacturing Science & production, Vol.8. Nos.
All metals are susceptible to corrode, some more likely than others. It is the material make up of the metal which has a large influence over the corrosiveness of any metal. As mentioned previously we know that the properties of the material and its environment influence the corrosiveness of any metal, also combining dissimilar metals may progress corrosion as well. Scientist have created a table known as the Galvanic Series which list metals and there relative activeness in order in a salt water environment. This table ranges from metals like Platinum, being o... ... middle of paper ... ...d services of gas, water, electricity and communications.
A compound that contains impurities will tend to melt over a range of temperatures and at temperatures lower than the fixed mp for the pure compound. For example naphthalene, an ingredient of mothballs, has a melting point of 80°C and a pure sample of naphthalene would most likely be observed to melt within 80-81°C. An impure sample of naphthalene might melt over a range from 75-80 °C. Impurities in the crystals of the compound weaken the structure, which results in the compound melting at a lower temperature. In addition, impurities will be unevenly distributed throughout a sample of a compound.
There are trade-off between properties of meterials.People chose materials according to desired properties. They prefered steel to iron and stainless steel to steel. Steel has high tensile strength compare to the iron. Stainless steel has some characteristic features that make it very popular in variety applications. It’s corrosion-resistant, durable and dilutable structure make stainless steel very popular in the structure.
1. INTRODUCTION Diffusion Surface hardening (DSH) is a popular technique used to enhance the surface properties of the steel by adding the atoms of carbon, nitrogen, boron or combination of the mating surface. DSH gives a hard outer case with a soft tough core. The increased hardness of outer case improves the wear resistance of the steel part which in turn improves the service life of the part. Carburizing is one of the commercial and extensively used surface hardening techniques in engineering industries for its simplicity and cost-effectiveness.