Expert Answer:Effect of Carbon Content on Tensile Strength Lab R

  

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Below are major errors commonly performed by novice technical writers:
1. Pronouns are used. Technical writing is one of the few writing techniques that does not adapt well to
the use of pronouns. Avoid using he, she, they, us, we, you, and I. Too many grammatical errors arise
when using pronouns in technical writing.
2. Reports are written in multiple verb tenses. Always write your technical report is past tense.
Remember, the experiment has already been completed. If you are writing instructions, then the active
verb tense is preferred. I am asking for a report on what was performed and what was learned.
3. Rambling information. Remember the objective and goal of the experiment. Too many times students
will try to “impress the teacher”. This is not the purpose of the laboratory exercise. The intent of the
laboratory exercise is to reinforce a concept discussed during lecture. The purpose of practicing technical
writing is to develop good writing skills that convey information concisely, accurately, and clearly.
4. Reports are written toward me, the teacher. Yes, I do know what you are writing about but I will
correct your technical report objectively. Too often, students will write a report vaguely and assume that
“I know what you mean”. Do not make this assumption. I will read it as though I do not know you, do
not know the subject, and have a rudimentary technical knowledge (typical of most Americans) in the
topic.
Please do not use any pronoun.
Effect of Carbon Content on Tensile Strength
Lab Objectives
Conduct tensile tests on various steel materials Review how to use the tensile test to determine
mechanical properties of steel Become familiar with the effects of carbon content on the tensile
strength of steel Observe the effect of alloying in carbon steel
Materials and Equipment
3 Standard 0.505 in. round tensile test bar, each of 1018, A36 (1025) Steel, and 1045, plain carbon
annealed and normalized steel, 60,000 lb. hydraulic tensile testing machine Rockwell hardness testes,
equipped with the appropriate indenter and weights to read the Rockwell B and C scale (If necessary).
Extensometer (to be attached to each test bar for measuring fine displacement) Hammer and 2.000”
punch for gage marking 6” calipers
Safety Note Wear safety glasses at all times when using the laboratory equipment, including tensile
testing machine, hardness tester, heat treating oven, punching fixture, and 2.000” gage punch.
Procedure 1.
Use the letter punches to stamp identification marks on the ends of each test bar for permanent
identification throughout the project. 2. Select one of the three annealed test bars for the tensile test. 3.
Punch one set of 2.000” gage marks in the gauging area of each test bar. Measure the punch accurately
using the caliper. Record the measurement and enter the information into the tensile testing software
when prompted. 4. Using the caliper, measure the cross-sectional diameter of the test bars in the center
of the gage marks. Record the measurement and enter the information into the tensile testing software
when prompted.
5. Load one of the test bars into the tensile testing machine and lower the crosshead down until a very
light force is applied to the test bar. Verify the test bar is vertical and the bar fits snuggly into the test
fixtures. 6. Attach the extensometer to the gage marks on the test bar. 7. Slowly increase the load on
the test bar at a minimum load rate of 1,000 psi/min but not greater than a maximum loading rate of
2,000 psi/min. Try to maintain a constant load rate through the whole test. 8. When the computer
indicates the yield strength has been attained, stop the machine and carefully remove the
extensometer. Do not unload the test bar. 9. Once the extensometer has been removed, apply the
same loading rate as specified in step 7 until the test bar fractures. 10. Remove the test bar from the
machine, press the broken ends together, and measure the final gage length. 11. Repeat the entire
procedure for the other three test bars 12. Measure the Rockwell C or B hardness value of each test
bar. Record these values.
Requirements for Laboratory Report The laboratory report will consist of Abstract (100 words or less)
Minimum three paragraph introduction discussing the effect of carbon content on the mechanical
properties of steel. (Maximum length of the introduction is eight paragraphs) Presentation of data
including tables and charts 1. Tabulate the physical properties of modulus of elasticity, hardness, %
elongation, yield strength, and tensile strength. Compare the samples with values from a reference
book. 2. Plot the tensile strength, yield strength, and ductility of the steel samples as a function of
carbon content. Place all three mechanical properties on one graph and use a secondary axis for
ductility. Discussion of findings (Do not exceed six paragraphs) Conclusions Include in your report
the following review and discussion topics. These are guidelines for you to write your report. Do not
write answers directly to the questions but address the proposed technical issues in your report.
Discuss the effects of carbon content, in terms of ferrite and pearlite, on tensile strength, yield strength,
and ductility by comparing all of the test results and calculations for each tested steel. Discuss the
effects of carbon content on the hardness for each steel.
Normalaized
Original L Oreginal diameter
M of E
Sample one
2.01
0.156 25.9MSI
1018
yeld stress
462491MSI
Tensile
L
68460PSI 2.775 Inch
Diameter
0.308
sample 2
1018
2.007
0.516 28.0MSI
476563MSI
66380PSI
2.66
0.305
2.01
0.512 28.9MSI
65.605MSI
98198PSI
2.622
0.34
2.01
0.518
30.6
49649
85040
2.616
0.367
2.01
0.5
31.2
35345
61486
2.82
0.303
201
0.511
30
55373
61.8
2.821
0.316
Sample 3
1045
Annealed
Sample 1
1045
Sample 2
1018
sample 3
1025
Elongation
Reduction of Aria Hardness( Rockwell B)
Ductility
38.8
64.4
86
38.8
38.3
65.05
91
38.7
31.101
55.9
101
38.9
32.8
49.8
93
38.8
42
6020%
82
38.7
33
61.8
85
38.8

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