How likely is carbon steel is to resist to fatigue and why?
Why do materials (such as steel, polymer and plastic) undergo fatigue? When steel experience fatigue, what happens to it?
(A) Describe how fatigue damage happens in a ductile material. Draw sketches if needed. (B) If we maintain a constant stress σ-0.9G (GIs the yield strength) on a steel, will fatigue damage happen? Why? (A) Describe how fatigue damage happens in a ductile material. Draw sketches if needed. (B) If we maintain a constant stress σ-0.9G (GIs the yield strength) on a steel, will fatigue damage happen? Why?
2. What is the carbon content of 1020 steel? How does changing the carbon content affect the properties of steel? To make a material such as steel more ductile what changes can be made to its chemical composition? (15 points) 3. What are several common point defects in metals, list 2 and provide a brief description of them? Specific to steel what is the main type of point defect and why is it important to the behavior of steel? (15...
(2) Explain why stainless steel is more corrosion resistant in many environments than plain carbon steel.
1. a. Distinguish between mechanical fatigue, thermomechanical fatigue, thermal fatigue and corrosion fatigue. b. Differentiate between the S-N curves of plain carbon steels and aluminum alloys. c. Why is it important to have a smooth surface on a sample used for rotating beam fatigue test? d. State four ways to increase the fatigue life of a component.
4. (a) Why are the steel gears case hardened? How it is done? (b) For a 1020 steel it has been determined that a carburizing treatment of 15 hr duration at 900 °C will raise the carbon concentration to 0.35 wt% at a point 2.0 mm from the surface. Estimate the time necessary to achieve the same carbon concentration at a 6.0 mm position from the surface for the same steel and at the same carburizing temperature.
Why do some people resist the idea of working in teams? As a manager, how would you overcome that resistance?
What is the fatigue lifetime for this steel if the stress amplitude is 65% of the tensile strength?
Is carbon tetrabromide more likely to dissolve in water or liquid CO2? Why?
Why did accelerated corrosion took place on carbon steel despite the presence of an inner coating? How could it be avoided by changing the design or the material choice? "Area Effects in Galvanic Corrosion" A large ratio of cathode-to-anode surface area is to be avoided because the galvanic attack is concentrated in small areas, and penetration of the anode thickness is hastened. Large anode surface spreads the attack over a greater area and reduces the rate of penetration. A classic...