Heat Treatment and Qualitative Metallographic Analysis Laboratory

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 Heat Treatment and Qualitative Metallographic Research Lab Essay

Heat Treatment and Qualitative Metallographic Analysis Lab

ME 3228: Mechanics & Materials Clinical

Summary

Comparing a material's initial treatment and the microstructures that are formed from distinct processes, an engineer may accurately understand why certain cured materials of the same family could be stronger than another. With this experiment annealed and cold-worked specimens of AISI 1018 STEEL are used, along with a Hardness tester, a grinding and polishing process, and a micrograph to see the grain composition of the steel. After putting a specimen by using a process applying each device, grain constructions of in different ways treated supplies can be compared. The Firmness Tester gives a value with the strength of your material and this case the annealed stainlesss steel was forty-eight. 6 HRB, untreated metallic is usually around 73 HRB, and the cold rolled metallic was 85. 8 HRB, in the Rockwell scale. These types of strength values can then be employed comparatively with each of the steel's microstructures. The grinding and polishing techniques, along with a remedy used to etching the surface of the steel, is then used to prepare the material for the micrograph. The steel was initially prepared with four types of significantly fine sandpaper and then lustrous with several types of increasingly fine polycrystalline diamonds suspension fluid and paper. A 2% Nital solution is then used to etch the top, or to associated with grains from the steel even more prominent. After this, a micrograph is used to see the grain buildings of the differently treated stainlesss steel and compare the different dimensions of ferrite, pearlite, and more such as cementite. The wheat structures for every single steel diverse on these proportions. The annealed metallic was made up of 77% ferrite, which is innately soft and roughly twenty percent pearlite which is much harder. From just visual interpretations, the cool rolled metal possessed a far bigger content of pearlite, irrespective of initial predications that the selections would consist of similar make up. Regardless, this test shows the reason why dealing with a material before it truly is used can be beneficial in some situations when ever hardness is needed.

Table of Contents

Summary…………………………………………………………………………………………………………………………………… 2 Set of Equations………………………………………………………………………………………………………………………… some List of Tables……………………………………………………………………………………………………………………. …………5 List of Figures….. ………………………………………………………………………. ………………………………………………... 6 Introduction……………………………. ………………………………….. ……………………………………………………………... 7 Theory…………….. ……………………………………………. …………………………………………………………………………... almost 8 Test Installation & Trial and error Procedure…………………………………………………………. ……………………………. 11 Benefits & Discussion. ………………………………….. …………………………………………………………………………. …18 Conclusion………. …………………………………………………………………………………………………………………….. …23 References………. ………………………………………………………………………………………... ………………………….. …24 Appendix…………. ………………………………………………………………………………………………………………………. 25

List of Equations

1 . Lever rule……………………………………………………………………………………………………………………….. 9

List of Tables

1 . AISI 1018 Stainlesss steel chemical structure.......................................................................................................... 13 2 . Theoretical and Experimental disposition of anneal 1018 sample…………………………………………13

List of Characters

1 . Period diagram pertaining to steels. ………………………………………………..................................................... ………... …9

2 . Buehler Rockwell hardness tester.................................................................................................................... 12

3. Running wheels photo.......................................................................................................................................... 12

5. Polishing rims...

References: 1 . Mario T. Charles " Improved Heater Control for Short-Cycle High temperature Treating” http://forms.gradsch.psu.edu/diversity/sroppapers/2003/CharlesMariolJ.pdf (2013)

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3. University or college of Va " Microstructure and Phase Transformations in Multicomponent Systems” http://www.slideserve.com/topaz/microstructure-phase-transformations-in-multicomponent-systems (2013)

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five. " ASTM E18 - 12 Common Test Options for Rockwell Firmness of Metal Materials” http://www.astm.org/Standards/E18.htm (2013)

Appendix

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