# minimum yield strength of 900MPa

minimum yield strength of 900MPa
This assignment is based on tutorials and answers should be supported by illustrations (sketches and graphs) wherever relevant. Any references used should be specified after each question.
All Answers must be less than or equal to ¾ of a page in 12 point Font, excluding graphics and references!
This second part of the tutorial assignment is due to be submitted by the end of the lecture in week 12.
7. Explain how you could obtain a minimum yield strength of 900MPa through the full thickness of a 100 mm diameter shaft manufactured from 4340 steel. This explanation should include specific details of the heat treatment processes and include temperatures/time and supporting data and graphs.
NOTE the diameter and steel grade (ie 4340) cannot be altered. (20 marks)
8. How would you differentiate between Surface Corrosion, pitting corrosion and crevice corrosion? (7 marks)
9. Would Iron (Fe) corrode in de-aerated dilute hydrochloric Acid (HCl)? (6 Marks)
Give the Equations and calculate the Gibbs Free Energy to determine your answer.
10. A steel tie rod 23 mm in diameter has the following minimum properties:
Yield Strength = 700MPa
Tensile Strength = 800Mpa
Fracture Toughness = 95MPam0.5
It was subjected to an axial tensile force of 300kN.
Determine its mechanical safety with respect to ductile and brittle fracture. Consider ß = 1.
Hint: Brittle fracture would occur if the rod contained a crack. (10 marks)
11. What would the following features on the fractured surface face of a broken shaft tell you about the mode of failure and the levels of stress that that shaft experienced? (7 marks)
(a) beach marks
(b) ratchet marks
(c) size of final fracture area

Engineering Materials – Tutorial Assignment 2, Semester 1 2014
This assignment is based on tutorials and answers should be supported by illustrations (sketches and graphs) wherever relevant. Any references used should be specified after each question.
All Answers must be less than or equal to ¾ of a page in 12 point Font, excluding graphics and references!
This second part of the tutorial assignment is due to be submitted by the end of the lecture in week 12.
7. Explain how you could obtain a minimum yield strength of 900MPa through the full thickness of a 100 mm diameter shaft manufactured from 4340 steel. This explanation should include specific details of the heat treatment processes and include temperatures/time and supporting data and graphs.
NOTE the diameter and steel grade (ie 4340) cannot be altered. (20 marks)
8. How would you differentiate between Surface Corrosion, pitting corrosion and crevice corrosion? (7 marks)
9. Would Iron (Fe) corrode in de-aerated dilute hydrochloric Acid (HCl)? (6 Marks)
Give the Equations and calculate the Gibbs Free Energy to determine your answer.
10. A steel tie rod 23 mm in diameter has the following minimum properties:
Yield Strength = 700MPa
Tensile Strength = 800Mpa
Fracture Toughness = 95MPam0.5
It was subjected to an axial tensile force of 300kN.
Determine its mechanical safety with respect to ductile and brittle fracture. Consider ß = 1.
Hint: Brittle fracture would occur if the rod contained a crack. (10 marks)
11. What would the following features on the fractured surface face of a broken shaft tell you about the mode of failure and the levels of stress that that shaft experienced? (7 marks)
(a) beach marks
(b) ratchet marks
(c) size of final fracture area
PLACE THIS ORDER OR A SIMILAR ORDER WITH US TODAY AND GET AN AMAZING DISCOUNT ?

# Our Service Charter

1. ### Excellent Quality / 100% Plagiarism-Free

We employ a number of measures to ensure top quality essays. The papers go through a system of quality control prior to delivery. We run plagiarism checks on each paper to ensure that they will be 100% plagiarism-free. So, only clean copies hit customers’ emails. We also never resell the papers completed by our writers. So, once it is checked using a plagiarism checker, the paper will be unique. Speaking of the academic writing standards, we will stick to the assignment brief given by the customer and assign the perfect writer. By saying “the perfect writer” we mean the one having an academic degree in the customer’s study field and positive feedback from other customers.
2. ### Free Revisions

We keep the quality bar of all papers high. But in case you need some extra brilliance to the paper, here’s what to do. First of all, you can choose a top writer. It means that we will assign an expert with a degree in your subject. And secondly, you can rely on our editing services. Our editors will revise your papers, checking whether or not they comply with high standards of academic writing. In addition, editing entails adjusting content if it’s off the topic, adding more sources, refining the language style, and making sure the referencing style is followed.
3. ### Confidentiality / 100% No Disclosure

We make sure that clients’ personal data remains confidential and is not exploited for any purposes beyond those related to our services. We only ask you to provide us with the information that is required to produce the paper according to your writing needs. Please note that the payment info is protected as well. Feel free to refer to the support team for more information about our payment methods. The fact that you used our service is kept secret due to the advanced security standards. So, you can be sure that no one will find out that you got a paper from our writing service.
4. ### Money Back Guarantee

If the writer doesn’t address all the questions on your assignment brief or the delivered paper appears to be off the topic, you can ask for a refund. Or, if it is applicable, you can opt in for free revision within 14-30 days, depending on your paper’s length. The revision or refund request should be sent within 14 days after delivery. The customer gets 100% money-back in case they haven't downloaded the paper. All approved refunds will be returned to the customer’s credit card or Bonus Balance in a form of store credit. Take a note that we will send an extra compensation if the customers goes with a store credit.

We have a support team working 24/7 ready to give your issue concerning the order their immediate attention. If you have any questions about the ordering process, communication with the writer, payment options, feel free to join live chat. Be sure to get a fast response. They can also give you the exact price quote, taking into account the timing, desired academic level of the paper, and the number of pages.

Excellent Quality
Zero Plagiarism
Expert Writers

or