Hardness Tests and Charpy Impact Test

A graph of the hardness of the material versus the percentage cold work was plotted for both specimens. In both cases, it was observed that the percentage of cold work increases proportionately with an increase in the hardness of the

11. Perform the Mohs hardness test on all of the samples in your set; determine which is the hardest and softest.

Two major laboratories have given two stones that differ markedly in overall quality the same grade. Explain

A sample was taken on January 26, 2016 using a random sampling procedure. The length and

In other words, the material is not subjected directly to heat treatment (annealing) but it is subjected to forging at first. After forging, the forged brass alloy is fully annealed. Then the fully annealed brass alloy is subjected to mechanical processing, and then processed brass alloy is subjected to soft annealing so that the forged product will have a stable structure.

The Steel’s physical properties include a stiffness level similar to mild steel. With the addition of chrome and molybdenum the steel can be strong enough to butt or be thinned down in the middle, thus making the material lighter.

Overall, the 1018 and 1045 steel specimens displayed similar relationships between the heat-treating procedures. The 1045 steel had a greater tensile strength in all states except for the quenched state. In general, the 1018 steel specimens were more ductile than the 1045 steel specimens in all states.

The visit influences our practical as we gain an understanding of how in the engineering industry selection of materials is determined using indicators such as Young’s Modulus. Young’s Modulus is a measure of stiffness that is independent of the particular sample of a substance. This indicator is very vital as it determines the material’s strength, toughness

Sample 2 demonstrated characteristics of a low carbon steel. It softened drastically during the annealing process and progressively hardened with each increase in quench rate, but never achieved a very high rating.

giving a total hardness value of 166.1 ppm for Speedwell Forge Lake, 34.59 ppm for

Choose an unknown sample to test for estate the same results from other groups. After choosing the unknown sample, we tested for the following properties like physical characteristics, conductivity, solubility, conductivity of the solution, aqueous solution, and flam testing. For each step that written the results recorded in the table for matching the same sample from each group. Group 5 has the same solid that we have in group 10.

Iron comes in many forms including cast iron, galvanized iron, steel, stainless steel and tool steel. Each of these different forms of iron have different components (all including iron)and different properties and different uses. Cast iron is made up of iron + up to 5% of carbon and occasionally 1-3% of silicone. Cast iron main properties are that it is hard, brittle and it rusts easily. Cast iron is usually mostly used to make or form components of camp ovens, engines, cylinder blocks and woks. Steel is another metal made from iron and less than 1% carbon. The advantages of steel is that it is hard, strong and malleable and this makes steel perfect for uses such as buildings, machinery, transportation, cans and containers and household appliances. The first uses of iron is about 6000 years ago people would make tools, weapons and ornaments

Table 3: Hardness readings of four sample hardness test results in 10 minutes after quenching into water

Steel products were defined by several attributes which determined the product application and defined quality. Grade described the metallic (chemical) composition of the steel, or the elements added to the basic recipe of iron and carbon to create the desired properties. Product described the shape of the product, including semi-finished shapes (blooms, billets and bars) and finished shapes (wires and coils). Surface finish described the smoothness and polish that could be applied to the material’s surface to enhance presentation. Size described the latitudinal and longitudinal dimensions of the product. Structural quality described the absence of breaks in the inner metallic structure. Surface quality described the absence of cracks or seams on the surface. Because specific applications called for specific attributes, many products were customized along one or more attributes for the customer. However, of all attributes, customers valued most the grade, which determined product performance.

Metal caps are cemented to the end-surfaces of the samples so that tensile load can be applied to the samples until failure.