Abstract
Hot stamping is an attractive method to produce extra high strength automotive components. In the conventional hot stamping, the furnace heating is employed and the heating rate is quite low. To improve the productivity of the hot stamping technology, the reduction of time for the heating process is required. In this study, the influence of the heating rate in a range up to 200°C/s, heating temperatures between 650°C and 950°C and cooling condition on microstructure and mechanical properties of 0.22% C -3%Mn steel has been investigated. The steel is a promising material for the highly productive new hot stamping technology because this steel transformed into martensite from austenite even at cooling in free air. The specimens heat-treated at a high heating rate and for short holding time at the heating temperature just above Ac3 show significantly fine martensite microstructure and a good strength-toughness balance. In this paper, the α → γ transformation behavior and the γ → α transformation behavior after inter-critical annealing are discussed to explain the evolution of the microstructures and mechanical properties.
| Original language | English |
|---|---|
| Title of host publication | Materials Science Forum |
| Pages | 330-333 |
| Number of pages | 4 |
| Volume | 654-656 |
| DOIs | |
| Publication status | Published - 2010 |
| Event | 7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7 - Cairns, QLD, Australia Duration: Aug 2 2010 → Aug 6 2010 |
Publication series
| Name | Materials Science Forum |
|---|---|
| Volume | 654-656 |
| ISSN (Print) | 02555476 |
Other
| Other | 7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7 |
|---|---|
| Country | Australia |
| City | Cairns, QLD |
| Period | 8/2/10 → 8/6/10 |
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Keywords
- Extra high strength steel
- Grain refinement
- Hot stamping
- Reaustenitization
- Tempering
- Transformation
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
Influence of thermal history on microstructure and mechanical properties of steels for hot stamping. / Senuma, Takehide; Takemoto, Yoshito.
Materials Science Forum. Vol. 654-656 2010. p. 330-333 (Materials Science Forum; Vol. 654-656).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Influence of thermal history on microstructure and mechanical properties of steels for hot stamping
AU - Senuma, Takehide
AU - Takemoto, Yoshito
PY - 2010
Y1 - 2010
N2 - Hot stamping is an attractive method to produce extra high strength automotive components. In the conventional hot stamping, the furnace heating is employed and the heating rate is quite low. To improve the productivity of the hot stamping technology, the reduction of time for the heating process is required. In this study, the influence of the heating rate in a range up to 200°C/s, heating temperatures between 650°C and 950°C and cooling condition on microstructure and mechanical properties of 0.22% C -3%Mn steel has been investigated. The steel is a promising material for the highly productive new hot stamping technology because this steel transformed into martensite from austenite even at cooling in free air. The specimens heat-treated at a high heating rate and for short holding time at the heating temperature just above Ac3 show significantly fine martensite microstructure and a good strength-toughness balance. In this paper, the α → γ transformation behavior and the γ → α transformation behavior after inter-critical annealing are discussed to explain the evolution of the microstructures and mechanical properties.
AB - Hot stamping is an attractive method to produce extra high strength automotive components. In the conventional hot stamping, the furnace heating is employed and the heating rate is quite low. To improve the productivity of the hot stamping technology, the reduction of time for the heating process is required. In this study, the influence of the heating rate in a range up to 200°C/s, heating temperatures between 650°C and 950°C and cooling condition on microstructure and mechanical properties of 0.22% C -3%Mn steel has been investigated. The steel is a promising material for the highly productive new hot stamping technology because this steel transformed into martensite from austenite even at cooling in free air. The specimens heat-treated at a high heating rate and for short holding time at the heating temperature just above Ac3 show significantly fine martensite microstructure and a good strength-toughness balance. In this paper, the α → γ transformation behavior and the γ → α transformation behavior after inter-critical annealing are discussed to explain the evolution of the microstructures and mechanical properties.
KW - Extra high strength steel
KW - Grain refinement
KW - Hot stamping
KW - Reaustenitization
KW - Tempering
KW - Transformation
UR - http://www.scopus.com/inward/record.url?scp=77955506528&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955506528&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.654-656.330
DO - 10.4028/www.scientific.net/MSF.654-656.330
M3 - Conference contribution
AN - SCOPUS:77955506528
SN - 0878492550
SN - 9780878492558
VL - 654-656
T3 - Materials Science Forum
SP - 330
EP - 333
BT - Materials Science Forum
ER -