US Army Correspondence. (2000). METAL PROPERTIES, CHARACTERISTICS,. US ARMY REPAIR SHOP TECHNICIAN WARRANT. Retrieved from www.hnsa.org/doc/pdf/metal-properties
It should be noted that the grain size of the material can be varied by heat treatment process. The billets are exposed to heat treatment with different temperatures (5500C and 6500C) and working times to obtain different grain size. The original microstructure of copper and aluminum is shown in Fig. 6 and Fig 7.
In Friction stir welding process melting does not occur and joining takes place below the melting temperature of the material. Frictional heat is generated between the wear-resistant welding tool and the material of the workpieces. This heat causes the workpieces to soften without reaching the melting point and allows the tool to traverse along the weld line. Defect free copper welds are achieved by friction stir welding carried out at a constant welding speed of 100 mm/min.. The effect of various input speed on microstructure and mechanical properties of friction stir welded Cu–30Zn brass alloy is investigated . Friction stir welding of 5mm thick pure copper plates were done. The characteristics of the microstructure, different heat zones and mechanical properties of welded joints are investigated . The temperature distributions of the weld, Brinell's hardness test, tensile test and microstructure analysis are performed on the welded aluminium alloy
Wrought Iron 1.0 Introduction Wrought Iron is a specific type of iron, which literally means “worked iron”. It’s a traditional material worked by the blacksmith in the past. According to Lister, (1957) the word of “worked” refers to the method to produce the wrought iron. It was repeatedly hammered to its intended shape.
Forging, one of many manufacturing process, is where metal is pressed, pounded or squeezed under great pressure into high strength parts known as forgings. The process begins with starting stock which is heated to its plastic deformation temperature, then upset between dies to the desired shape and size. It is important to note that the forging process is entirely different from the casting (or foundry) process, as metal used to make forged parts is never melted and poured (as in the casting process). During this hot forging process, coarse grain structure is broken up and replaced by finer grains. Mechanical properties are therefore improved through reduction of cast structure, voids and segregation. Forging also provides means for aligning
Screwdrivers are very popular among the hand tools which we use in our daily use. But now a days the screwdriver demands hardness and higher torque values for the meeting the requirements and to compete between the manufacturers. For maintaining both torque and hardness in higher level. there are mainly three key factors for the producing the required type of screwdriver : heat treatment, material and machining processing. On the other hand the most famous type of steel used in the manufacturing of the screwdriver bit are Cr-V type of steel, material wise known as SAE6150 steel. The hardness of this material is known to be HRC52 (+ 0r - ,2) and the value of torque is about 180 - 190 kgf.cm. There are different varieties of tips for a screwdriver which include Robertson ,clutch, .Allen and Torx but very standard types of tips are flat, slotted, straight or flared.
According to recent statistics, zinc is the third most commonly used nonferrous metal in the United States. This unassuming metal was among the first minerals exploited by Man, used as a decorative material for thousands of years, although it never achieved the fame and notoriety of other metals such as gold or silver. In more recent times, new extraction and processing methods have allowed Man to produce higher-quality zinc than ever before, and to use it in an astonishingly high number of chemical and high-tech applications.
Lead Many elements, like lead, are very important to the structure and formation of many of the products we use. Throughout history, lead has been developed, mined, extracted, and used. Lead, since its finding thousands of years ago, has proven to be a tricky element with many diverse health effects. Scientists have developed products, and processes that still continue to used lead.