I. Martensitic stainless steels are capable of being heat treated II. Austenitic Stainless Steels are the most corrosion resistant because of the high chromium contents III. Ferritic Stainless Steels are hardened and strengthened by cold work Which statement(s) is/are true given above about stainless steels?
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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 FalseOf the following alloys, pick the one(s) thatmay be strengthened by heat treatment,cold work, or both: R50250 titanium, AZ31Bmagnesium, 6061 aluminum, C51000 phos-phor bronze, lead, 6150 steel, 304 stainlesssteel, and C17200 beryllium copper.3-Miled steel can be converted into high carbon steel by which of the following heat treatment process: a- Normalizing b- Annealing c- Nitriding d- Case hardening 4-Which one of the following is the solid carburizing material: a-Charcoal b-NH4 c-NaOH d-CH4
- Why must cracks in the martensite layer of high-manganese steels be removed?How do ferrite and cementite work together to form a strong ductile steel?36 Asiacell O Homework 4 -... -> 3 Class Materials Eng. Dep. Heat Treatment Ismail Ibrahim Marhoon Homework 4 Q1: 1.5 in diameter steel part is quenched in oil with no agitation. (H=0.20). If we use a 4340; 4140; 8640; 5140; 1040 steel, what would be the hardness number at the center of the part? Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar. Given Cingrate t 00c00 143 to 4340 50 40 8640 ab 9310 30 4320 1050 1040 10 20 it 1 1 2n 10 20 30 Jominy distance th of an inch) Die he eted e TABLE The N canticient, or seveity of the querch, far several guenehing sedla H Coefticient Coaling Rate at he Center of a l-in. Bar (CA) Medium Ol no taton) 04 anitation) 025 18 45 HyD inc agtation H0 fegiutont Brine Ino agtaton) Brine lapttiori 10 4.0 190 20 60 90 230 Ad DISTANCE FROM OUENCHED END IN) DIAMETER IN)
- Martensitic sainless steel has corrosion resistance than ferritic and austenitic sainless steels. lower maybe higher or lower O higherAnswer 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.,What is the composition (wt% C) of a steel with AISI designation 1090? .Would this be considered a low, medium, or high carbon steel? (circle one)Austentitic stainless steel's are not hardenable by cold working however Austentic stainless steel's can be strengthened by heat treatment true or false?