2. Ferritic stainless steel - Ferritic stainless steels has good engineering properties when compared with austenitic stainless steel grades. In Ferritic stainless steel nickel and chromium content is low so it has low corrosion resistance. Ferritic stainless steels are normally less
1.Introduction Stainless steels are engineering materials and it are a complex group of iron based alloys containing at least10.5% chromium and a maximum of 1.2 % carbon. In order to define the stainless steel it can be said that the base alloy for this material is iron which contains a minimum of %11 Chromium (Cr) . The European Standard EN10088 (EN2005) defines stainless steels as iron based alloys containing at least10.5% chromium and a maximum of 1.2% carbon. The main factor for the corrosion resistance of stainless steel is its chromium content. Under the influence of oxygen from air or water, the chromium rapidly forms a very thin, chromium (III) rich oxide film on the surface of the steel.This layer very effectively separates the material from the surroundings.It is adherent, coherent and insoluble under normal conditions.
Introduction: The objective for the lab was to determine properties of materials by using a tension test. The properties that were determined was Young’s Modulus, ultimate tensile strength, and yield strength. Three aluminum alloys were tested. The first was the AA 2024 , which is high strength used in aerospace applications. The second specimen was AA 5052, which had low strength, but high ductility.
This is because the steel is hard but brittle and has internal stresses. The solution to this is by tempering to increase toughness, reduce the brittleness but in turn reduces hardness. Tempering a steel heats up the steel to temperatures ranging from 200-500°C depending on the desired mechanical properties. Heating after the quenching allows the carbon to diffuse into the martensite to relieve internal stresses. The end result would be the shock absorption capability which depends on the tempering temperature (higher the temperature, higher the shock
The rate of cooling is immaterial except for some steels which are susceptible to temper brittleness. As the tempering is increased, the martensite of hardened steel passes through stages of tempered martensite and is gradually changed into a structure consisting of spheroids or cementite in a matrix of ferrite, formerly termed as sorbite. These changes are accompanied by a decreasing hardness and increasing toughness. The tempering temperature depends upon the desired properties and the purpose for which the steel is to be used. If considerable hardness is necessary then the tempering temperature needs to be low.
In an Izod impact test, the material actually had the lowest of these polymers, which means that PLA has a very low impact strength. For food packaging polymers, an important factor is their ability to resist transfer of gases, water vapor, and aroma molecules. This is also referred to as permeation, which is not a strong area of PLA. This is due to higher crystallinity of biaxially oriented PLA film. PLA can be recycled back into lactic acid and can be used to make materials of the same quality as before.
The scarcity of fine aggregate for the production of mortar and concrete, as partial replacement of sand by Copper Slag have been identified. Several researchers have investigated the use of copper slag in the production of cement, mortar and concrete as raw materials for clinker, cement replacement, coarse and fine aggregates. This paper reports on some experimental investigations on the influence of partial replacement of sand by copper slag on the mechanical properties of concrete. M30 grade concrete was designed using copper slag, partially replacing the fine aggregate The fine aggregate was replaced by copper slag at various percentages ranging from 0%, 10%, 20%, 30%, 40%, 50%, 60%, 80% and 100%. The mechanical properties of concrete determined in the laboratory include compression strength, splitting tensile strength and flexural tensile strength.
If steel wool is made of fine strands of steel, and steel is a form of metal, metal is known to be a good conductor of heat because of the close packing of the metal ions in the lattice and the delocalised electrons that can carry kinetic energy through the lattice. That’s why steel wool was predicted to be the best insulator to keep heat in and the stubby was predicted to be the best cooling insulator. THE INDEPENDENT VARIABLE(S) The independent variables can be changed such as the different types of materials used which are the steel wool, the bubble wrap and the stubby. THE DEPENDENT VARIABLE The dependent variable is the type that can’t be changed. In this practical the dependent variable is the temperature.
For this the mold should be made from high strength preferably of hardened steel. Secondly, for better mechanical properties it is advised that the molded items be annealed. Thirdly, mold release agents if required should only be made from fluorine based compounds to avoid stress cracks. Applications Poly (ether sulphone) has a variety of applications in a vast array of fields. The most successful applications are mentioned below.
(Engineers say "Stress is proportional to strain".) In symbols, F = kx, where F is the force, x is the stretch, and k is a constant of proportionality. If Hooke's Law is correct, then, the graph of force versus stretch will be a straight line. Tensile testing experiment Purpose of the experiment: Tensile testing is one of the most fundamental tests for engineering,and provides valuable information about a material and its associated properties. These properties can be used for design and analysis of engineering structures, and for developing new materials that better suit a specified use.The basic idea of a tensile test is to place a sample of a material between two fixtures called "grips" which clamp the material.