Quiz: Heat Treatment - Quenching & Tempering
Quiz: Heat Treatment - Quenching & Tempering
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Experiment 5: Heat Treatment - Quenching & Tempering
Conventional heat treatment procedures for producing martensitic steels generally involve continuous and rapid cooling of an austenitized specimen in some type of quenching medium, such as water, oil, or air. The properties of a steel that has been quenched and then tempered depends largely on the rate of cooling and tempering times and temperatures. During the quenching heat treatment, the specimen can be converted to a variety of microstructures including soft and ductile spheroidite to hard and brittle martensite. The production of pearlitic and bainitic steels is lower in cost and suffices for most applications. Martensitic steels must be tempered prior to use due to their extreme brittleness. A range of heat treatments producing a variety of microstructures and mechanical properties will be investigated in this experiment beginning with a set of initially equivalent samples of SAE 1040 steel. Pearlite, Bainite and Martensite will all be produced through variations in the cooling rates of initially austenized samples.
Great place to begin with
First post on here so I would like to thank whoever it is that has made imechanica.org possible. I have tried the editor and find it very instinctive, certainly easy and above all functional. Again my thanks go to those who have made it possible.
As somebody who has invested both time and money in this concept I am very pleased to see it gaining momentum and it is very helpful when a site such as this becomes available to the general public. Well all I can wish for upcoming users is that may all you have website of your own soon. I designed mine from www.webdesigningcompany.net , hopefully all of net bees here get a step better ,may we shall have a very healthy discussion on this plateform.
Hopefully the site can receive some good exposure over the coming weeks, months as the scenario here gathers pace. Good luck and good fortune to everyone.
Plastic Deformation Recovery in Freestanding Nanocrystalline Aluminum and Gold Thin Films
Science 30 March 2007:
Vol. 315. no. 5820, pp. 1831 - 1834
DOI: 10.1126/science.1137580
Jagannathan Rajagopalan, Jong H. Han, M. Taher A. Saif*
In nanocrystalline metals, lack of intragranular dislocation sources leads to plastic deformation mechanisms that substantially differ from those in coarse-grained metals. However, irrespective of grain size, plastic deformation is considered irrecoverable. We show experimentally that plastically deformed nanocrystalline aluminum and gold films with grain sizes of 65 nanometers and 50 nanometers, respectively, recovered a substantial fraction (50 to 100%) of plastic strain after unloading. This recoverywas time dependent and was expedited at higher temperatures. Furthermore, the stress-strain characteristics during the next loading remained almost unchanged when strain recovery was complete.These observations in two dissimilar face-centered cubic metals suggest that strain recovery might be characteristic of other metals with similar grain sizes and crystalline packing.
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Self-healing polymers - an introduction
I'm now working on the preparation and characterization of self-healing polymers, a promising branch in materials science. The following is a general conception of this kind of materials system. (Pasted from our group website http://www.autonomic.uiuc.edu.) I may introduce some of my current work later.
Boundary Element Method for Hyperelastic Materials
I am interested in using the Boundary Element Method for the hyperelastic materials. The objective of this work is to simulate the behaviour of elastomeric or rubber-like materials parts. I am now in the derivation stage, and I intened to use Ogden constitutive model with this derivation.
Ph.D. Studentships in Spacecraft Design, Dynamics and Control
The Department of Aerospace Engineering at Ryerson University has a strong and vibrant research programme involving the development of pico- and femto-satellites (weighing less than 1 kilogram) under Dr.
micromechanics of composite materials
This blog focuses on the micromechanics modeling of composite materials.
a little about myself
First of all, I am hardly a writer and to be honest, this tiny entry will probably have taken me a couple hours. Between watching tv, procrastinating, surfing the web, dealing with my recent concussion and the dizziness that has been associated with it, I've been having a bit of a tough time this semester. I think some of that may just be due to the fact that I'll be graduating (hopefully) soon.
World Universities’ ranking on the Web
I found very interesting web site (at least for me). That is World Universities’ ranking on the Web (WR).