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ASM Handbook

Steel Heat Treating Fundamentals and Processes

Edited by
Jon L. Dossett
Jon L. Dossett
Consultant
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George E. Totten
George E. Totten
Portland State University
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ASM International
Volume
4A
ISBN electronic:
978-1-62708-165-8
Publication date:
2013
Book Chapter

Tempering of Steels[1]

By
Renata Neves Penha
Renata Neves Penha
Revising author
Universidade de São Paulo
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Lauralice C.F. Canale
Lauralice C.F. Canale
Revising author
Universidade de São Paulo
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Jan Vatavuk
Jan Vatavuk
Universidade Presbiteriana Mackenzie
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Steven Lampman
Steven Lampman
ASM International
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Published:
2013
Page range:
327 - 351
Publication history
July 08, 2013

Abstract

Tempering of steel is a process in which hardened or normalized steel is heated to a temperature below the lower critical temperature and cooled at a suitable rate, primarily to increase ductility, toughness, and grain size of the matrix. This article provides an overview of the variables that affect the microstructure and mechanical properties of tempered steel, namely, the tempering temperature, tempering time, carbon content, alloy content, and residual elements. Tempering after hardening is performed to relieve quenching stresses and ensure dimensional stability of steel. The article discusses the embrittlement problems associated with tempering. Four types of equipment are used for tempering, namely, convection furnaces, salt bath furnaces, oil bath equipment and molten metal baths. Special procedures for tempering are briefly reviewed.

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Renata Neves Penha, Lauralice C.F. Canale, Jan Vatavuk, Steven Lampman, 2013. "Tempering of Steels", Steel Heat Treating Fundamentals and Processes, Jon L. Dossett, George E. Totten

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