thermal treatment is able to create harder metallic structure? A. Tempering: B.
ID: 2087765 • Letter: T
Question
thermal treatment is able to create harder metallic structure? A. Tempering: B. Annealing: C. Quenching I8. Which fabrication method is NOT suitable for brittle metals? A Forming: B. Casting: C. Power Metallurgy 19 Which one is the minimum temperature for hot working of metals? A. Glass transition temperature: B. Recrystallization temperature; C. Melting temperature The images below show microstructures of three types of cast irons, and please answer questions 20-25 20. Which one of these three cast iron structures has the best ductility? 21. Which one represents the microstructure of gray iron? 22. Which one has excellent wear property? 23. The fabrication of which needs Ce? 24, which one is produced when Si content isExplanation / Answer
17. A - Tempering is the process of heating a metal to achieve higher hardness and elasticity.
18. A - brittle materials cannot be formed due to it's low ductile nature and elasticity property.
19. C - working of metals below its melting temperature is called hot working of metals
20. C - because of the presence of graphite rosettes in a ferrite matrix
21. A - Dark graphite flakes are embedded in ferrite matrix for grey cast iron
22. A - Due to its self lubricating property due to the presence of graphite rosettes
23. A - Cerium is added in white cast iron
24. A - Grey cast iron has silicon content in the range of 1 - 3%
25. B - Cementite is the intermetallic compound of carbon and iron, which is present in white cast iron.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.