Details
| Original language | English |
|---|---|
| Pages (from-to) | 1453-1462 |
| Number of pages | 10 |
| Journal | Journal of Materials Engineering and Performance |
| Volume | 25 |
| Issue number | 4 |
| Early online date | 16 Mar 2016 |
| Publication status | Published - Apr 2016 |
Abstract
Air-water spray cooling was employed during a heat treatment to enhance the mechanical properties of microalloyed medium carbon steel test cylinders (38MnVS6, 88 mm diameter). Using appropriate cooling times and intensities, the test cylinders’ surfaces could be quenched and subsequently self-tempered by the residual heat of the core. Simultaneously, it was possible to keep the core regions of the cylinders in the bainitic regime and carry out a quasi-isothermal holding. The resulting microstructures consisted of tempered martensite (near-surface) and bainite with pearlite and ferrite (core). Compared to the standard heat treatment (controlled air cooling), the tensile properties (proof stress and ultimate tensile strength) could be improved for both near-surface and core regions with the adapted spray cooling. A hardness profile with 450 HV10 surface hardness and a hardening depth of more than 11 mm could be realized. In addition, an increase of the impact toughness for the core was achieved, resulting in approximately 25 J charpy impact energy. This is a substantial improvement compared to standard heat treatment procedure and values reported in the literature and can be attributed to the reduced pearlite volume fraction and the increased amount of fine bainite.
Keywords
- 38MnVS6, heat treatment, mechanical properties, microstructure, phase transformation, spray cooling
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Journal of Materials Engineering and Performance, Vol. 25, No. 4, 04.2016, p. 1453-1462.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Process Integrated Heat Treatment of a Microalloyed Medium Carbon Steel
T2 - Microstructure and Mechanical Properties
AU - Herbst, Sebastian
AU - Schledorn, Mareike
AU - Maier, Hans Jürgen
AU - Milenin, Andrij
AU - Nürnberger, Florian
N1 - Funding information: The authors thank the German Research Foundation (DFG) for financial support within the Project NU297/2-1 and the Institut für Umformtechnik und Umformmaschinen (IFUM) of the Leibniz Universität Hannover for supplying the material.
PY - 2016/4
Y1 - 2016/4
N2 - Air-water spray cooling was employed during a heat treatment to enhance the mechanical properties of microalloyed medium carbon steel test cylinders (38MnVS6, 88 mm diameter). Using appropriate cooling times and intensities, the test cylinders’ surfaces could be quenched and subsequently self-tempered by the residual heat of the core. Simultaneously, it was possible to keep the core regions of the cylinders in the bainitic regime and carry out a quasi-isothermal holding. The resulting microstructures consisted of tempered martensite (near-surface) and bainite with pearlite and ferrite (core). Compared to the standard heat treatment (controlled air cooling), the tensile properties (proof stress and ultimate tensile strength) could be improved for both near-surface and core regions with the adapted spray cooling. A hardness profile with 450 HV10 surface hardness and a hardening depth of more than 11 mm could be realized. In addition, an increase of the impact toughness for the core was achieved, resulting in approximately 25 J charpy impact energy. This is a substantial improvement compared to standard heat treatment procedure and values reported in the literature and can be attributed to the reduced pearlite volume fraction and the increased amount of fine bainite.
AB - Air-water spray cooling was employed during a heat treatment to enhance the mechanical properties of microalloyed medium carbon steel test cylinders (38MnVS6, 88 mm diameter). Using appropriate cooling times and intensities, the test cylinders’ surfaces could be quenched and subsequently self-tempered by the residual heat of the core. Simultaneously, it was possible to keep the core regions of the cylinders in the bainitic regime and carry out a quasi-isothermal holding. The resulting microstructures consisted of tempered martensite (near-surface) and bainite with pearlite and ferrite (core). Compared to the standard heat treatment (controlled air cooling), the tensile properties (proof stress and ultimate tensile strength) could be improved for both near-surface and core regions with the adapted spray cooling. A hardness profile with 450 HV10 surface hardness and a hardening depth of more than 11 mm could be realized. In addition, an increase of the impact toughness for the core was achieved, resulting in approximately 25 J charpy impact energy. This is a substantial improvement compared to standard heat treatment procedure and values reported in the literature and can be attributed to the reduced pearlite volume fraction and the increased amount of fine bainite.
KW - 38MnVS6
KW - heat treatment
KW - mechanical properties
KW - microstructure
KW - phase transformation
KW - spray cooling
UR - http://www.scopus.com/inward/record.url?scp=84961208873&partnerID=8YFLogxK
U2 - 10.1007/s11665-016-2004-9
DO - 10.1007/s11665-016-2004-9
M3 - Article
AN - SCOPUS:84961208873
VL - 25
SP - 1453
EP - 1462
JO - Journal of Materials Engineering and Performance
JF - Journal of Materials Engineering and Performance
SN - 1059-9495
IS - 4
ER -