he microconstituent in a steel with carbon concentration higher than 0.15 wt% is_________. This microstructure can be converted into ______ and _____ via tempering.
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After quenching, the microconstituent in a steel with carbon concentration higher than 0.15 wt% is_________. This microstructure can be converted into ______ and _____ via tempering.
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- fill in the blanks The eutectic point is the lowest melting point which can be seen on the iron-carbon equilibrium phase diagram at ___________ percent carbon. The eutectoid point means the lowest transformation temperature in a solidified alloy. On the iron-carbon equilibrium phase diagram the eutectoid point is at _________percent carbon. true or false What happens to a quench-hardened tool or machine part that was not tempered when it is subjected to shock loads or bending stress? It is not supposed to be tempered because once it is tempered, it will be brittle. True FalseThe 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 _____________________What does the process of temper drying do for hardened carbon steel?
- Tempering is a heat treatment applied to hardened steels that is best defined as which of the following (one correct answer): O heating and soaking at a temperature above the austenitizing level followed by rapid cooling O heating and soaking at a temperature above the austenitizing level followed by slow cooling O heating and soaking at a temperature below the austenitizing level followed by rapid cooling O heating and soaking at a temperature below the austenitizing level followed by slow cooling10.11/ 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?phase TÇF Iron -carbon phase diagram 2802°F (1539°C 1600 2912 L+ö 2719°F (1493°C) 1400 2552°F (1400°C) 0.16% Y+L, L+Fe3C 2192 4.3% 2097°F (1147°C) 2.06% 1200 Асм 1832 Аз. 1000 1670°F (910°C) Austețite + cementite+ledeburite Cementite + ledeburite 1472 800 1333°F(723°C) 0.025% 1112 p.83% A2= 1418"F(770°C) 600 752 A1, A2 400 Cementite + pearlite + transformed ledeburite 392 200 FezC 32 3 5 6 6.67% Carbon,% Figure Fe - C phase diagram Perlite+ferite Perlite+cementite
- The γ phase in steel can transform into Pearlite and ____ through diffusional processes.14- On the basis of accompanying isothermal transformation diagram for a 0.45 wt% C iron- carbon alloy, specify the nature of the final microstructure for the following heat treatments after austenitizing the sample at 775°C: a. Rapidly cool to about 590°C (just above the doted line), hold at this temperature for 10 s, and then rapidly quench to room temperature. b. Rapidly cool the specimen to about 675°C, hold at this temperature for 1000 s, then rapidly quench to room temperature. c. Reheat the specimen in part (b) to 700°C (1290°F) for 20 h then slowly cool to room temperature. d. Rapidly cool to about 400°C, hold at this temperature for about 1 s, and then rapidly quench to 295°C and hold for 1000 s then slow cooling. e. Rapidly cool to room temperature then reheat to 425°C for 4000 s then slowly cool to room temperature. Temperature (°C) 900 800 700 600 500 400 300 200 100 0 0.1 A A M(start) M(50%) M(90%) 1 A+ F B 10 A + P A + B *50% 10² Time (s) 10³ 104 1600 1400 1200 1000 800…How would the following heat treatment be conducted, quoting approximates temperatures, cooling rate and microstructure of:(i) Normalizing of a plain carbon steel containing 0.8 wt % C, (ii) Quenching of a plain carbon steel containing 0.8 wt % C in water (iii) Quenching of a plain carbon steel containing 0.8 wt % C in oil (iv) full annealing of a plain carbon steel containing 0.8 % C.
- What is the% C ratio of two different steels with 80% and equal austenite content at 724 Celsius?1-Compact Graphite cast iron was obtained from fast cooling rates.? T F 2-Strength and ductility of nodular iron approximately the same under tension and compressive loads.? T F 3-The grey should be heated to 700 oC for 30 hours to obtain malleable iron? T F 4-The carbon in CGI alloys is neither flakes nor cementite? T F 5-Exhaust manifold manufactured from white cast iron.? T F 6-The reduced section length of the tensile specimen should be at least four times the diameter.? T F 7-Tangent modulus is taken as the slope of the stress–strain curve at yield stress? T…Austentitic stainless steel's are not hardenable by cold working however Austentic stainless steel's can be strengthened by heat treatment true or false?