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- Title
Influence of Cold Forming and Heat Treatment on the Microstructure and Mechanical Properties of an Air-Hardening Steel.
- Authors
Grydin, Olexandr; Rodman, Dmytro; Schaper, Mirko
- Abstract
The use of air-hardening steels in the manufacture of automobile body components shortens the corresponding process chain by means of eliminating the immersion or gas quenching operation since hardening occurs in still air. To choose the optimal forming and heat-treatment parameters, the development of the microstructure needs to be considered as a consequence of the thermomechanical production processes. The object of this work is to investigate the effects of forming and the subsequent heat-treating on the changes of the microstructural parameters for the air-hardening steel LH800. For this purpose, specimens were processed under different forming and heat-treating conditions and subsequently examined by means of SEM and mechanically tested using tensile tests. Based on this, an empirical equation was derived which describes the influence of both the martensite's bundle thickness and the original austenite's grain size on the yield stress. In this way, microstructural parameters can be identified which lead to good mechanical properties. The measured correlation can thus be used for modeling the LH800 steel's forming and heat-treatment processes.
- Subjects
HEAT treatment of steel; MICROSTRUCTURE; MECHANICAL properties of metals; STEEL quenching; HARDENABILITY of metals; THICKNESS measurement
- Publication
Steel Research International, 2012, Vol 83, Issue 11, p1020
- ISSN
1611-3683
- Publication type
Article
- DOI
10.1002/srin.201200037