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Softening in Weld Heat Affected Zone of Dual Phase Steel Sheet for Automotive Wheel Rim
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English
Abstract
Dual phase steel offers potential for wheel weight reduction, but has not been completely succeeded, in part, because of a localized necking or a fracture during rim fabrication. This failure should be related to a softening in the weld heat affected zone (HAZ).
This paper investigates mechanical properties through microstructural change produced in the HAZ of as-rolled dual phase steel and finally suggests a practical solution. The softening, caused by heating the steel up to Ac1 in the HAZ, is found to be affected not only by tempering of martensite, but also by the variation of hardness in ferrite matrix. Moreover strain aging as well as work hardening due to up-setting stage during the flash welding also concerns this problem. Coiling temperature in manufacturing as-rolled dual phase steel has a large effect on the conditions of ferrite and martensite. Control of the temperature is of great importance to avoid such a localized necking or a fracture in the HAZ.
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Authors
- Kazutoshi Kunishige - Central Research Laboratories, Sumitomo Metal Industries, Ltd
- Nobuyuki Yamauchi - Central Research Laboratories, Sumitomo Metal Industries, Ltd
- Takao Taka - Central Research Laboratories, Sumitomo Metal Industries, Ltd
- Noriaki Nagao - Central Research Laboratories, Sumitomo Metal Industries, Ltd
Topic
Citation
Kunishige, K., Yamauchi, N., Taka, T., and Nagao, N., "Softening in Weld Heat Affected Zone of Dual Phase Steel Sheet for Automotive Wheel Rim," SAE Technical Paper 830632, 1983, https://doi.org/10.4271/830632.Also In
References
- Rashid, M.S. Rathke: A.E. SAE Technical Paper, 810026 1980
- Hamamatsu, S. Sugisawa, S. Kunishige, K. Takahashi, M. Nagao, N. SAE Technical Paper, 820015 1982
- Kunishige, K. Takahashi, M. Sugisawa, S. Hamamatsu: S. Sumitomo Metal 33 1981 497
- Tachimoto, K. Saiga, Y. Fukagawa: M. Tetsu-to-Hagané 58 1972 13 1791
- Hashimoto, S. Tsugami, Y. SAE Technical Paper, 820283 1982