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Influence of Ferrite Content on Fatigue Strength of Quenched and Tempered 42CrMoS4 Steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Specimens of steel 42CrMoS4 were quenched from the austenite (γ) and the ferrite (α) + austenite + cementite phase fields to produce fully martensitic matrices with 0 – 14 % ferrite dispersed in the matrix. After tempering at 300°C or 600°C mechanical and fatigue properties were determined. As expected yield strength, tensile strength and hardness decreased with increased tempering temperature and ferrite content. Quite unexpected, the fatigue properties were mildly affected. A small amount of ferrite, approximately 3% even appears to improve the fatigue strength. Then, at even higher ferrite amounts, slightly below 20% the fatigue strength appears to decrease again.

Place, publisher, year, edition, pages
Keyword [en]
Quenched and Tempered Steel, Fatigue strength, Ferrite Content
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-102023OAI: diva2:550361
Subject / course
Materials Processing
Educational program
Master of Science - Engineering Materials Science
Available from: 2012-09-12 Created: 2012-09-06 Last updated: 2012-09-12Bibliographically approved

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Hanno, Mithaq Elias
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