(0) (ii) Explain how an understanding of the creep failure mechanisms of high temperature nickel alloys has led to alloy and manufacturing developments which have resulted in an increase in the maximum operating temperature of a jet engine turbine blade. If we quench a plain carbon steel we can produce a very strong/hard and yet brittle material. Why does the quench lead to this change in properties, and what subsequent heat treatment would enable us to mostly retain the high strength whilst improving the ductility? Explain the effects of your proposed heat treatments in terms of the phase

(0) (ii) Explain how an understanding of the creep failure mechanisms of high temperature nickel alloys has led to alloy and manufacturing developments which have resulted in an increase in the maximum operating temperature of a jet engine turbine blade. If we quench a plain carbon steel we can produce a very strong/hard and yet brittle material. Why does the quench lead to this change in properties, and what subsequent heat treatment would enable us to mostly retain the high strength whilst improving the ductility? Explain the effects of your proposed heat treatments in terms of the phase

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Define quenching. (a) What effects does it have on the microstructure? (b) How does this affect dislocation movement? (c) Why/how does this affect the properties?
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
Give the correct answer with explaination.
Please solve
Refer to the Time Temperature Transformation (TTT) diagram given in Appendix A: (i) Determine the resulting microstructure for 0.8% carbon steel if the steel is rapidly cooled from the y region to 280°C within 5 seconds. (i) If the resulting microstructure in Question 6b (i) above is reheat to 300°C within 1 minute and hold for 1 hour at remain temperature, then and then rapidly quenched to room temperature, determine its final microstructure. (ii) If the resulting microstructure in Question 6b (i) above is reheat to 300°C within 1 minute and hold for 16 minutes at remain temperature, then and then rapidly quenched to room temperature, determine its final microstructure. (iv) Arrange the mircostructures 6 (b) (i,i and i) from the lowest to the highest hardnes value. (v) Sketch the thermal history from Question 6b (i) to (ii) on a TTT diagram.
QUESTION 4 A method of determining the result of heat treatment as well as the state of a metal prior to heat treatment TTTArial 3 (12pt) Path: p !!!
Nickel-based alloys are used for gas turbine blades in aerospace engines. Briefly discuss the characteristics that make these alloys the choice for this application. Single-crystal technology is applied to nickel alloys that are used as gas turbine blades in aerospace engines. With the aid of sketches describe how a single-crystal casting can be manufactured and explain why a single-crystal casting is likely to have superior creep resistance than a directly-solidified one. Demonstrate the application of the Ten-percent Rule by calculating the approximate tensile strength and elastic modulus in the 0° direction of a carbon-fibre reinforced polymer composite if the strength and elastic moduluş in the 0° single ply are 3620 MPa and 143 GPa respectively. The lay-up sequence of the composite is [02/+45/-45/902]s.
Example: Two pieces of the same aluminium alloy were Precipitation Hardened; one by Natural Aging (25°C) and one by Artificial Aging (180°C). If it took 10 minutes for the Natural Aged specimen to reach a RHB of 43 and it took only 3 minutes for the Artificial Aged specimen to reach a RHB of 43, determine the Activation Energy, Q, for the aluminium alloy.
Metal y (mJ/m)n Slip Character (a) Discuss why Planar slip is associated with a small stacking fault energy, as shown in the table below. (b) Sketch the shape of a single-crystal shear stress-strain curve for Al and Stainless Steel, (1label) stage I, II and III portions of deformation, which one end stage II and begin stage III sooner?. S.Steel <10 -0.45 Planar Cu -90 -0.3 Planar/ wayy Al -250 -0.15 wayy
What is the tensile curve of a steel material containing 0.6 carbon after water quenching, tempering (500°C+30 min) and normalization (800°C+1 hour) annealing? Show and explain the tensile test curve.
A mild steel specimen is given to you which has a tensile strength of 40MPA and your main objective is to increase its strength. What type of heat treatment would you recommend? Justify your answer with proper reasoning.