**4. Conclusions**

The hot stamping experiment of the U-shaped component was performed with segmented heating and a cooling tool. The relationship between the springback angle and the area fractions of martensite, bainite, and ferrite at di fferent tool temperatures was obtained. The conclusions are as follows:


**Author Contributions:** X.L. conceived and designed the experiments; X.Y. performed the experiments; Z.Z. polished the writing and grammar.

**Funding:** This work was supported by National Natural Science Foundation of China (51205162 and 51275203). **Conflicts of Interest:** The authors declare no conflict of interest.
