Cold and Hot Rolling of Aluminum

Cold and Hot Rolling of Aluminum - Reduct ion(Figur ee4) T...

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Temp. C (Figure 4) Hardness Reduction (Figure 3) Hardness Experiment #3 - Cold and Hot Rolling of Aluminum Group #8 in lab section of MIME 261 Instructors: Dr. Florence Paray Lab Date: September 20 th , 2010
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Introduction: - Because of its integral role in the manufacturing industry, aluminum has become one of the world’s most utilized metals. The markets for aluminum are extremely diverse and include industries such as: building and construction materials, automotives, and food/beverage packaging. (1) Aluminum possesses certain characteristics that make it appealing to the manufacturing industry: Lightweight High strength to weight ratio Excellent corrosion resistance Excellent conductor of heat and electricity Good ductility Good reflective properties Impermeability Odorless Recyclable (Aluminum is also the most commonly recycled post-consumer metal in the world.) Formability Availability Rolling is an important metal forming operation in that it helps modify the strength and shape of the final product. This process involves both hot and cold rolling depending on the desired outcome. Rolled aluminum products include roofing and siding materials, road and rail vehicles, food and beverage cans, foil wrapping, and other commonly used items. (2) O BJECTIVES : To develop an understanding of why hot and cold rolling are useful during the manufacturing processes. To develop an understanding as to what physically happens to the structure of a material when it undergoes hot and cold rolling.
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To understand how to test the final product once it has been made. Theory: - Rolling increases the strength of the aluminum by increasing the number of crystallographic defects. This is known as work hardening. Rolling at high temperature decreases the degree of work hardening by reducing the number of defects formed. (3) One important type of crystallographic defect is called a dislocation. This can be thought of as an extra partial line or plane of atoms embedded in the otherwise perfect lattice structure. Dislocations are responsible for the malleability and hardness of a material. To better understand the concept, think of a lattice structure as being a rug, with a dislocation being a fold in that rug (Figure 1). This fold eventually becomes pinned down in the presence of more folds. This is known as work hardening because it increases the hardness of a metal’s surface. (4). (Figure 2) (Figure 1) (Figure 2)
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Cold and Hot Rolling of Aluminum - Reduct ion(Figur ee4) T...

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