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- Ferritic sainless steel can be hardened as much as austenitic stainless stess. False O True Non ferrous alloys has greater stiffness than ferrous alloys. O True FalseThis equilibrium phase of steel only occurs at temperatures above 723° C: martensite ferrite austenite O cementitewhat are the uses of low-alloy steel in the industry of Engineering?
- Satainless steel contain at least 10.5% chromium to provides protection from the corrosion. True False Copper alloys have high thermal conductivity. True False The sensitization condition may occurs because the carbon is tie-up as carbide. True ! 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 FalseAnswer with true (T) or false (F), corrects the wrong phrases, and gives short reason(s) for correct and corrected statements: 1- Normalized steels have better strength and toughness as compared to annealed steels. 2- Ferrous alloys are most important and widely used in comparison to any other metals. 3- Metals of BCC crystal structure are denser than metals of FCC structure. 4- Hypo-eutectoid steels fully annealed by heating to about 30°C above the upper critical temperature. X A3 5- The full martensite microstructure can be obtained by cooling the steels with any cooling rate. 6- There is a large volume expansion when martensite forms from austenite.,
- Answer with true (T) or false (F), corrects the wrong phrases, and gives short reason(s) for correct and corrected statements: 1- Normalized steels have better strength and toughness as compared to annealed steels. 2- Ferrous alloys are most important and widely used in comparison to any other metals. 3- Metals of BCC crystal structure are denser than metals of FCC structure. 4- Hypo-eutectoid steels fully annealed by heating to about 30°C above the upper critical temperature. 5- The full martensite microstructure can be obtained by cooling the steels with any cooling rate. 6- There is a large volume expansion when martensite forms from austenite.Answer with true (T) or false (F), corrects the wrong phrases, and gives short reason(s) for correct and corrected statements: 1- Normalized steels have better strength and toughness as compared to annealed steels. 2- Ferrous alloys are most important and widely used in comparison to any other metals. 3- Metals of BCC crystal structure are denser than metals of FCC structure. 4- Hypo-eutectoid steels fully annealed by heating to about 30°C above the upper critical temperature.X A3 5- The full martensite microstructure can be obtained by cooling the steels with any cooling rate. 6- There is a large volume expansion when martensite forms from austenite.,A 200g hypoeutectoid plain carbon steel contains 5.1wt% eutectoid ferrite. 1) What is its average carbon content in weight? 2) What is the weight of total ferrite? 1600 8+7 Liquid 1400 L+ Fe;C L+y 1200 1148°C y austenite 1000 2.0 4.3 y + Fe,C 800 e 723°C 600 0.8 0.02 400 a + Fe,C Fe;C 200 0% C 100% Fe 6 6.67 Fe,C 3 4 Weight percent carbon Temperature ("C)
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