Martensitic sainless steel has corrosion resistance than ferritic and austenitic sainless steels. lower maybe higher or lower O higher
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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 FalseQuestion-6 A 0.25% C hypoeutectoid plain-carbon steel is slowly cooled from 950°C to a temperature just slightly below 723°C. (a) Calculate the weight percent proeutectoid ferrite in the steel. (b) Calculate the weight percent eutectoid ferrite and weight percent eutectoid cementite in the steel.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
- Slowly cooled plain carbon steel has proeutectoid ferrite to be 10 wt% of its eutectoid ferrite. What is the carbon content of the steel?How do ferrite and cementite work together to form a strong ductile steel?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?
- This equilibrium phase of steel only occurs at temperatures above 723° C: martensite ferrite austenite O cementiteProblem 1 A 0.65 percent C hypoeutectoid plain-carbon steel is slowly cooled from about 950°C to a temperature just slightly above 723°C. Calculate the weight percent austenite and weight percent proeutectoid ferrite in this steel. a +y a a 0.02% C 0.65% C 0.80% CAnswer 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 plain carbon steel contains 45 wt.% proeutectoid ferrite. What is the average carbon content in weight percent?