School of Mechatronics Engineering Assignment Material Engineering ENT 145 Name: Ahmad Huzaifah Bin Azahari No. Matrik: 121110055 Course: Mechanical QUESTION 1 DESCRIBE CHARACTHERISTICS OF (a) AN ALLOY (b) PEARLITE (c) AUSTENITE (d) MARTENSITE (e) CEMENTITE (f) SPHERODITE AND (g) TEMPERED MARTENSITE. (a)ALLOY • Alloy steel is often subdivided into two groups: high alloy steels and low alloy steels. The difference between the two is defined somewhat arbitrarily. However
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Sciences‚ VIT University‚ Vellore 1 Phases in Fe–Fe3C Phase Diagram α-ferrite - solid solution of C in BCC Fe • Stable form of iron at room temperature. • The maximum solubility of C is 0.022 wt% • T Transforms t FCC γ-austenite at 912 °C f to t it t γ-austenite - solid solution of C in FCC Fe Fe3C (iron carbide or cementite) • This intermetallic compound is metastable‚ it remains as a compound indefinitely at room T‚ but decomposes (very slowly‚ within several years)
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seriesOrganizational structure and use conditions‚ the chromium cast iron can be divided into three categories: 1) with good high temperature properties of chromium white cast iron.This cast iron chromium content of 33% of their organizations‚ most of the austenite andiron chromium carbide‚ sometimes ferrite. This alloy in addition to a certain degree of wear resistance in high temperature operating conditions the temperature not higher than1050 ° C‚ with good oxidation resistance. 2) with good wear resistance
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ME2151-2 – Metallography (C8) Formal Report Objectives * To obtain experience in the metallographic preparation of metallic specimens. * To observe the various microstructures in a welded mild steel joint. Results Overview of 5 different microstructures in welded steel Detail microstructures of 5 different zones Discussion and analysis of results * The heat affected zone is a composition of parent metal which was heated to a high enough temperature for a sufficient period
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EM/JUNE14/MEC281 UNIVERSITI TEKNOLOGI MARA MEC281 MATERIAL SCIENCE Chapter 1: Structure TUTORIAL 1: Atomic Structure 1. Define : i. Atomic Mass ii. Atomic Number iii. Isotopes 2. Give the electron configurations for the following ions : i. Oxygen ii. P5+ iii. Ni2+ iv. Br- v. Cu PERIODIC TABLE MEC 281 EM/JUNE2014/MEC281 UNIVERSITI TEKNOLOGI MARA MEC281 MATERIAL SCIENCE Chapter 1: Structure TUTORIAL 2: INTERATOMIC BONDING‚ CRYSTAL STRUCTURES 1. Specify the type of atomic
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quenching process‚ and it is very important to the components of machine especially tool steel. One of the methods to determine the hardenability of steels is Jominy End-Quench Test. Hardening usually involves quenching where the steel is heated to austenite phase and fast cooling in the quench medium such as water‚ oil‚ salt solution‚ or air to produce microstructure of martensite. The martensite gives hard and brittle properties of steel. Usually‚ for heavy steel components‚ the hardness decreases
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cementite because it is hard. Following phases exist on Fe-Fe3C diagram: - liquid solution of iron and carbon (L) - ferrite ( ) – an interstitial solid solution of carbon in Fe (bcc). At room temperature ferrite is ductile but not very strong. - austenite - an interstitial solid solution of carbon in Fe (fcc). - cementite (Fe3C) hard and brittle compound with chemical formula Fe3C. It has metallic properties. On a base of Fe-Fe3C diagram we can divide iron-carbon alloys into: - steels‚ - cast steels
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Objective The purpose of the Jominy test in this experiment is to determine the hardenability of three types of steels‚ namely EN 8‚ EN 16 and EN 24. Introduction This report will try to illustrate how the hardenability of these types of steels vary and why. This will be done by using the Jominy end quench test on each of the test pieces and then testing the hardness of the particular steel from the quenched end‚ to the end of the test piece. Taking these different points will enable me to find
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temperature caused austenite grains to grow significantly. During the cooling to room temperature‚ this effect is retained as a region of coarse alpha-ferrite grains and Widmanstatten ferrite and pearlite. Zone 3: grain refinement zone In the grain refinement zone‚ the grain boundaries are closed and many small grains can be seen forming. This is because when the metal is cooled to room temperature‚ the austenite grains will start to nucleate at many points to form smaller austenite grains‚ and when
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temperature so that the phase ferrit and transform into pearlite austenite phase. Heating process is done depends on carbon content contained on the material. If you want to convert the material into austenite phase as a whole until keinti then the time warming up must be added. The speed of the warming also must be controlled so as not to cause gradients between surface with core part which will degrade the quality of the product. Austenite phase is reached after further cooling or quenching is done
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