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Keywords = indirect hot-stamping technology

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15 pages, 7558 KiB  
Article
Study on the Effect of the Pre-Forming of 22MnB5 Steel in Indirect Hot Stamping
by Ziming Tang, Zhengwei Gu, Yi Li, Xin Li, Ge Yu and Lingling Yi
Materials 2023, 16(10), 3739; https://doi.org/10.3390/ma16103739 - 15 May 2023
Cited by 6 | Viewed by 2228
Abstract
Based on the indirect hot-stamping test system, the effect of pre-forming on the microstructure evolution (grain size, dislocation density, martensite phase transformation) and mechanical properties of the blank in indirect hot stamping is systematically studied using ultra-high-strength steel 22MnB5. It is found that [...] Read more.
Based on the indirect hot-stamping test system, the effect of pre-forming on the microstructure evolution (grain size, dislocation density, martensite phase transformation) and mechanical properties of the blank in indirect hot stamping is systematically studied using ultra-high-strength steel 22MnB5. It is found that the average austenite grain size slightly decreases with the increase in pre-forming. After quenching, the martensite also becomes finer and more uniformly distributed. Although the dislocation density after quenching slightly decreases with the increase in pre-forming, the overall mechanical properties of the quenched blank are not greatly affected by pre-forming under the combined effect of the grain size and dislocation density. Then, this paper discusses the effect of the pre-forming volume on part formability in indirect hot stamping by manufacturing a typical beam part. According to the numerical simulations and experimental results, when the pre-forming volume increases from 30% to 90%, the maximum thickness thinning rate of the beam part decreases from 30.1% to 19.1%, and the final beam part has better formability and more uniform thickness distribution results when the pre-forming volume is 90%. Full article
(This article belongs to the Special Issue Advanced Manufacturing Processes of Metal Forming)
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