9 Material: Carbon SteelHeatTreatment 1ReadingReadingAverage2Hardness(kg/mm2)XD1YD2Quenching 20.13Tempering 40.01Normalizing27.95Annealing 24.34Explain the Microstructural differences ofeach treatment process that account for thedifference in hardness.22.7140.9627.4827.30808.1226.3482.9556.5

Heat treatment is the process of heating or cooling metals, alloys, plastics, and ceramic materials…

Answered: Material: Carbon Steel Heat Treatment 1…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Section: Chapter Questions

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Bainite phase and pearlite phase have different mechanical properties due to its structure differences. Discuss the hardness and tensile strength of these 2 phases using isothermal transformation temperature diagram.
11.14), specify the na- nure of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature. (b) Reheat the specimen in part a to 700°C (1290°F) for 20 h. (c) Rapidly cool to 600°C (1110°F), hold for 4 s, rapidly cool to 450°C (840°F), hold for 10 s, then quench to room temperature. (d) Cool rapidly to 400°C (750°F), hold for 2 s, then quench to room temperature. (e) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature. (f) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature. Rapidly cool to 575°C (1065°F), hold for 20 s, rapidly cool to…
In a eutectoid steel the following microstructures are required for different application. Suggest cooling rate and sequences to achieve them. a) 50% Pearlite and 50% Bainite b) 50% Bainite and 50% Martensite c)100% fine Pearlite d) 100% Martensite e) 50% Peralite and 50% Martensite
The chart below is for the properties of heat treated AISI 1340, oil quenched and tempered steel. Answer all five questions (numerical value) a) The tempering temperature associated with a tensile strength of 220,000 psi is ____________________ (b) The yield point associated with a % reduction of area of 60% is psi _____________________ (c) The tensile strength associated with a % elongation of 10% is psi ____________________ (d) The tensile strength associated with BD 331 is psi _______________________ (e) The HB number associated with a tensile strength of 245,000 psi is HB _____________________
10.11/ A 1.5-kg specimen of a 90 wt% Pb-10 wt% Sn alloy is heated to 250°C (480°F), at which temperature it is entirely an a-phase solid solution . The alloy is to be melted to the extent that 50% of the speci- men is liquid, the remainder being the a phase. This may be accomplished either by heating the alloy or changing its composi- tion while holding the temperature con- stant. (a) To what temperature must the speci- men be heated? (b) How much tin must be added to the 1.5-kg specimen at 250°C to achieve this state?
A 2.0-inch diameter 4140 steel bar is austenized and tempered in oil without Agitation, determine the resulting hardness at 0.6 inches below the surface, present all the Procedure to arrive at the answer (include sketch of the piece and graph used with steps Using word forms)
Choose one example of an engineering component that is made of steel and requires high hardenability properties. Discuss how the elemental composition of the steel-based material used for your component can be hardened. Your discussion must include the specific composition of the steel, properties, and processing method of the component until it is hardened using a continuous cooling transformation ( CCT ) diagram.
As the tempering temperature of a heat treated steel increases the associated values of Brinnell hardness also increase, while the values of tensile strength and yield strength decrease. True or false
Copper and copper alloys as specified by the Copper Development Association (CDA) and are designated as C00001 thru C99999 in the Unified Numbering System (UNS). True False An alloy steel designated as AISI 4130 WQT 700 means: chromium-molybdenum alloy steel containing .30% carbon in solution, that is through heat treated and water quenched. True False An AISI 4340 alloy steel contains .43 percent or 43 points of the element carbon in solution. True False Chemicals from which the commercially important plastic resins are derived are themselves derived from natural products that are quite plentiful; these raw materials include coal, water, limestone, sulfur, salt, and petroleum. True False There are two (2) types of polymerization; addition or linear and cross-linked or condensation. Addition polymers are thermoplastics and cross-linked polymers are thermosetting materials. True False
1. Why does the tensile strength of steel, which contains only austenite at room temperature, differ fromsteel that shows only pearlite in its microstructure? Give two important reasons for the difference. 2. What general prerequ_isites exist for the formation of martensite in steel? 3. What is an isothermal transformation of a material in the solid state condition? 4. Draw a typical isothermal transformation diagram for plain .carbon eutectoid steel and indicate thevarious decomposition products expected by simple diagrammatic drawing.
70) The lowest melting point for steel to be taught in the iron carbon phase diagram...A) eutectoidB) monocriticalC) eutecticD) subeutectoidE) peritectic 71) Which is not a surface texture parameter?A) roughnessB) cutting lengthC) arrayD) wavyE) hardness 72) Where do negative ions go in the electrochemical apparatus?A) to solutionB) to the cathodeC) first to the cathode, then to the anodeD) first to the anode, then to the cathodeE) anode
148) In which one do thermal shock and thermal cracking mostly occur?A) SemiconductorB) CompositeC) metalD) polymerE) Ceramic 150) what is the percent elongation of austenitic stainless steelA) 55%B) 20%C) 30%D) 8%E) 40% 151) Pentlandite is ore from which elementA) sulfurB) copperC) nickelD) aluminumE) manganese

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