Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet
AW-7xxx alloys have been nowadays considered for greater light weighting potential in automotive industry due to its higher strength compared to AW-5xxx and AW-6xxx alloys. However, due to their lower formability the forming processes are still in development. This paper investigates one such formin...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2017/7679219 |
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| author | M. Kumar N. G. Ross |
| author_facet | M. Kumar N. G. Ross |
| author_sort | M. Kumar |
| collection | DOAJ |
| description | AW-7xxx alloys have been nowadays considered for greater light weighting potential in automotive industry due to its higher strength compared to AW-5xxx and AW-6xxx alloys. However, due to their lower formability the forming processes are still in development. This paper investigates one such forming process called hot stamping. The investigation started by carrying out hot tensile testing of an AW-7xxx alloy, that is, AW-7921 at temperatures between 350°C and 475°C, to measure the strength and formability. Formability was found to improve with increasing temperature and was sensitive to the strain rate. Dynamic recovery is considered as usual reason for the formability improvement. However, examining the precipitation states of the as-received condition and after hot stamping using differential scanning calorimetry (DSC), the dissolution of precipitates was also believed to contribute to this increase in formability. Following solution heat treatment there was no precipitation during cooling across the cooling rates investigated (5–10°C/s). Samples taken from parts hot stamped at 10 and 20 mm s−1 had similar yield strengths. A 3-step paint baking heat treatment yielded a higher postpaint baking strength than a single step treatment. |
| format | Article |
| id | doaj-art-0042eaf36e9e4174affd353d3ccdaf92 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-0042eaf36e9e4174affd353d3ccdaf922025-02-03T05:51:33ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422017-01-01201710.1155/2017/76792197679219Investigations on the Hot Stamping of AW-7921-T4 Alloy SheetM. Kumar0N. G. Ross1LKR Leichtmetallkompetenzzentrum Ranshofen GmbH, Austrian Institute of Technology, Lamprechtshausnerstrasse 61, Postfach 26, 5282 Ranshofen, AustriaRobinson Research Institute, Victoria University of Wellington, 69 Gracefield Road, P.O. Box 33-436, Petone, Lower Hutt 5046, New ZealandAW-7xxx alloys have been nowadays considered for greater light weighting potential in automotive industry due to its higher strength compared to AW-5xxx and AW-6xxx alloys. However, due to their lower formability the forming processes are still in development. This paper investigates one such forming process called hot stamping. The investigation started by carrying out hot tensile testing of an AW-7xxx alloy, that is, AW-7921 at temperatures between 350°C and 475°C, to measure the strength and formability. Formability was found to improve with increasing temperature and was sensitive to the strain rate. Dynamic recovery is considered as usual reason for the formability improvement. However, examining the precipitation states of the as-received condition and after hot stamping using differential scanning calorimetry (DSC), the dissolution of precipitates was also believed to contribute to this increase in formability. Following solution heat treatment there was no precipitation during cooling across the cooling rates investigated (5–10°C/s). Samples taken from parts hot stamped at 10 and 20 mm s−1 had similar yield strengths. A 3-step paint baking heat treatment yielded a higher postpaint baking strength than a single step treatment.http://dx.doi.org/10.1155/2017/7679219 |
| spellingShingle | M. Kumar N. G. Ross Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet Advances in Materials Science and Engineering |
| title | Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet |
| title_full | Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet |
| title_fullStr | Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet |
| title_full_unstemmed | Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet |
| title_short | Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet |
| title_sort | investigations on the hot stamping of aw 7921 t4 alloy sheet |
| url | http://dx.doi.org/10.1155/2017/7679219 |
| work_keys_str_mv | AT mkumar investigationsonthehotstampingofaw7921t4alloysheet AT ngross investigationsonthehotstampingofaw7921t4alloysheet |