Why are the most precipitation-hardened alloys suitable only for low-temperature applications?
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Why are the most precipitation-hardened alloys suitable only for low-temperature applications?
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- Some alloys use a combination of strain hardening and precipitation hardening to achieve particularly high strength levels. The usual order of strengthening is solution treatment, quenching, cold working, and finally precipitation heat treatment. Why not reverse the order of the cold working and precipitation heat treatment steps?What is the% C ratio of two different steels with 80% and equal austenite content at 724 Celsius?Of 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.
- Which of the following is a method for strengthening metals and alloys: a. solution hardening b. full annealing c. work hardening d. incomplete casting e. cold working f. quenching g. incomplete fusionQuestion-5 (a) Describe the structural changes that take place when a 0.4%-C plain-carbon steel is slowly cooled from the austenitic region just above the upper transformation temperature. (b) What is a binary eutectic alloy system? Mention all important points. Give some examples.What is the% C ratio of two different steels with 80% equal and equal austenite content at 724 C?
- Discuss the heat treatment process which uses rapid cooling of steel in oil or molten salt bath?(c) The steels with the following compositions are heat treated and the results of microstructures are indicated in Table 2(c). Table 2(c): Heat treated steels and the results of microstructures Steel A 0.35 wt% C Coarse Pearlite Steel B 0.25 wt% C Coarse Pearlite Steel C 0.35 wt% C Fine Pearlite Rank the above steels based on carbon content and microstructures from the highest to the lowest hardness with justification.Determine the quenching and normalizing process temperatures of 2 different steels containing 0.6% C and 1.3% C (Ac3 and Acm will be considered linear)
- What kinds of dispersion hardened alloys can retain their strength up to 1000 ° C?How a heat treatment process needs to be carried out to obtain a martensite structure in steel? answer quickly?What are they and what is their application in the production of the following steels: TTT diagrams of non-eutectoid steel TTC continuous cooling diagrams Tempering of martensite