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Bake Hardening Steel (BH220) Characterization
Technical Paper
2008-01-2684
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The bake hardening effect depends on three parameters i.e. pre-straining, paint baking temperature and paint baking time. The combined effect of all these parameters results into the increase in yield strength, called the “baking effect”. This paper explains the individual effects of these parameters on the baking value. Tensile test were carried out for the 495 samples baked at baking temperature from 140°C to 250°C with differential baking time of 10, 15, 20, 25 and 30 minutes and differential pre-straining of 2%, 3% and 5%. The differences of yield strength between the unbaked and baked sample were calculated and the increase in yield strength was noted. After these laboratory trials 800 numbers of door outer panels of a small truck were formed and finish painted. The increment in yield strength after component forming and painting was determined by taking tensile samples from three different locations of 5 painted doors. This would help shop floor optimization of the process parameters and the compatibility with various painting process vis a vis increase in bake hardening strength. It is also leading to a future work to understand clearly the correlation between the baking temperature, increase in strength and the micro structural changes.
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Authors
Citation
Ghosal, S., Galgali, B., Ogale, M., and Joshi, S., "Bake Hardening Steel (BH220) Characterization," SAE Technical Paper 2008-01-2684, 2008, https://doi.org/10.4271/2008-01-2684.Also In
References
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- “High Strength Steel Sheets for Automobile Suspension and Chassis Use” by SHIMIZU Tetsuo FUNAKAWA Yoshimasa KANEKO Shinjiro JFE Technical Report, No.4 November 2004 25 31
- “Development Of Bake Hardening Effect By Plastic Deformation And Annealing Conditions” KVA KAJ T. et al Metalurgija 45 2006 1 51 55
- “Quantitative Observation of Grain Boundary Carbon Segregation in Bake Hardening Steel” by TAKAHASHI Jun SUGIYAMA Masaaki MARUYAMA Naoki Nippon Steel Technical Report, No. 91 January 2005 28 33
- “Understanding the Complexities of Bake Hardening Steel” Das S Singh S B Mohanty O N Bhadeshia H K D H Material Science and Technology 2008 24 1 107 111
- “Effect of Grain Size and Solid Solution Strengthening Elements on the bake hardenability of Low Carbon Aluminum Killed Steel” by HANAI Satoshi Nagayasu MIZUYAMA Yaichiro TAKEMOTO OKUNAGA Yoshikuni T Transaction ISU 24 1984 17 24