JOMINY - German-Jordanian University Industrial Engineering...

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German-Jordanian University Industrial Engineering Department Material Science Lab (IE2210) Fall 2007 Dr. Safwan A. Altarazi, Eng. Nidal Ha’boush, Eng. Abeer Daood Student Name: Nayef Fawaier 2008103042 Experiment Title: Hardenability and jominy test Out of Mark Title 10 Abstract 15 Introduction 15 Method 30 Results 20 Discussion and Conclusion 10 Report Organization and Neatness 100 Total Mark
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Material Science Lab. IE2210 Abstract Quenching changes the properties of the material and the microstructure. Hardenibility depends on the depth of hardness. In this experiment, we will use the JOMINY method to change the hardness of 2 specimen (D2, 1045) steel. Then we will compare the results and discuss and find the reason why the hardness is varying between them. Introduction The hardenability of a metal alloy is its capability to be hardened by heat treatment. It should not be confused with hardness, which is a measure of the material's resistance to indentation or scratching. Also, the hardness of the material depends on the rate at which austenite decomposes to form ferrite, pearlite, Bainite or martinsite. In which it is dependent on the composition of the steel, as well as on other factors such as the austenite grain size, and the degree of homogeneity in the distribution of the alloying elements. In which hardness depend upon: The carbon concentration, the higher it is the harder the material is. The presence of other alloying elements such as chromium, nickel, molybdenum, etc… which will increase the Martinsite transformation which would increase the hardness in return. The cooling rate, as discussed in lab 4. When the specimen is cooled with the faster cooling rate, the specimen structure would be Martinsite which is harder than other structures. It is extremely difficult to predict hardenability entirely on basic principles, and reliance is placed on one of several practical tests, which allow the hardenability of any steel to be readily determined: The Grossman test The Jominy end quench test As a result, in order to select an appropriate heat treatable engineering steel for a given application it is important to be able to measure its hardenability. The most convenient way to do this is via Jominy Hardenability (or End Quench) Test. The other technique is to use of -2-
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Material Science Lab. IE2210
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This note was uploaded on 12/18/2010 for the course APPLIED TE IE301 taught by Professor Olegvictorov during the Winter '10 term at German University in Cairo.

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JOMINY - German-Jordanian University Industrial Engineering...

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