Standard |
MCA 228 – Characteristics of
Metals/Heat Treatment II
Emphasizes selection of proper tool steel for specific tooling operations, and proper heat treating procedure of tool steels. Topics include: effects of alloy components in tool steel, identification of tool steel alloys, identification of tool steel by classification, and correct heat treatment procedures.
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Competency Areas |
Hours
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Tool Steel Alloy Components |
Class |
4 |
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Identification of Alloys |
D. Lab |
2 |
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Identification of Tool Steels by Classification |
P. Lab/O.B.I. |
0 |
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Correct Heat Treating Procedures |
Credit |
5 |
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Prerequisite: |
MCH 107 |
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Corequisite: |
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Course Guide |
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Competency |
After completing this
section, the student will: |
Hours |
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Class |
D.Lab |
P.Lab/
O.B.I. |
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STEEL ALLOY COMPONENTS |
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Terminology |
Describe alloy, tool steel, carbon steel, high speed steel, eutectic, heat treatment, phase change, alatropic metals, quenching, martinistic, and pearlite. |
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Structure |
Explain the iron - iron- carbide phase diagram. |
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Explain austenitic properties and the importance of austenite in heat treatment. |
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Diagram and describe the lattice structures found in metals. |
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Physical properties |
Define the terms that pertain to the physical properties of metals (hardness, ducticity, tensile strength, etc.). |
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Describe the testing methods to determine the physical properties of metals. |
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List common alloys of steel and the affect the alloy has on the physical properties of steel. |
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Describe forces on cutting tools and the affect of temperature increases during cutting operations on steel alloys. |
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IDENTIFICATION OF ALLOYS |
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Theory |
Explain SAE codes for common alloys of steel. |
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Describe the processes and explain why the smelting process would affect the properties of an alloy. |
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Demonstrate a spark test of carbon steels and determine carbon content. |
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Explain how a magnet can help identify alloys of steel. |
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Application |
Identify common steel alloys. |
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IDENTIFICATION OF TOOL STEEL BY CLASSIFICATION |
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Explain the ASTM and SAE numbering system for steel. |
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Explain the classification of steel by alloying elements. |
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List by number types of steel alloys used in tool steels with the advantages of each. |
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HEAT TREATMENT |
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Terminology |
Define the terms used in heat treatment by process and by components of each process (hardening, annealing, etc.). |
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Describe systems for applying heat for heat treatment. |
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Explain quenches, severity, and what the severity is compared to as a standard. |
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Describe the forms that carbon takes during heat treatment and how the different forms affect properties of steel. |
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Describe case hardening, its advantages, disadvantages and processes used to achieve case hardened material. |
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Application |
Perform heat treatment processes of high carbon steel and test the properties before and after treatment. |
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Suggested Resources |
Cain, T. (1984). Hardening, tempering and heat treatment. Tucson, AZ: Aztex.
Heat
treating, cleaning and finishing. (1964).
Machining
metals handbook. (1989).
Materials Park, OH: ASM International.
Ross, R. B. (1977). Handbook of metal treatments and testing. Tucson, AZ: Aztex.
Tool
materials for high-speed machining. (1987). Materials Park, OH: ASM International.
Walker, J. R. (1989). Machining fundamentals. South Holland, IL: Goodheart-Willcox.