The effect of alloying elements on creep behaviour with particular reference to steel

Glen, J (1959) The effect of alloying elements on creep behaviour with particular reference to steel. DSc thesis, University of Glasgow.

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Abstract

A large number of creep tests on various steels were carried out to study the effect of compositions heat treatment, and testing variables on the creep resistance. Some of this work has been published It was found however that the order of creep resistance of various steels could be changed by altering the stress or temperature of testing. A similar effect can occur on comparing the same steel in the normalised and in the normalised and tempered condition. The former is always the bettor at high stresses and /or temperatures but the tempered steel may be the better at low stresses and temperatures. Very long time creep and rupture tests were carried out on 0.5% molybdenum steel, 1% chromium - 0.5%molybdenum steel and on molybdenum-vanadium steel. From these tests an estimate of the creep and rupture strength in 100,000 hours was obtained and the change in rupture ductility with increasing testing time was demonstrated. The above tests indicated that the creep of commercial alloys was too complex a problem to be easily solved even by the accumulation of a large body of creep test data, and it was decided to approach the problem from a different angle. The effect of individual alloying elements was thus Investigated by carrying out true stress-true strain tensile tests on various steels over a range of temperature(3,5). It was found that, with a simple iron-carbon alloy, a maximum in stress was obtained at about 200

Item Type: Thesis (DSc)
Qualification Level: Doctoral
Additional Information: Adviser: N P Allan
Keywords: Materials science
Date of Award: 1959
Depositing User: Enlighten Team
Unique ID: glathesis:1959-72699
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 11 Jun 2019 11:06
Last Modified: 11 Jun 2019 11:06
URI: http://theses.gla.ac.uk/id/eprint/72699

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